915 j heads

I'm going from 1. The J head replaced the X head as a running change in mid 70 model year. 906. 516's have a flat intake port floor and the 915's have a nice radius that I believe helps the mixture make a nice laminar flow transition as it makes the bend to the valve pocket. They appear untouched to me. May 1, 2017 · These heads are referred to as “915” heads because the last three digits of the casting number are 915. On a 1970 'stock' 440 GTX with 3. IMO, put in a 1. Cylinder Head Freeze plugs for Mopar Chrysler Big Block 383 440 906 346 452 915. 00 +$150. LA Small-Block Mopar Cylinder Head Casting Numbers. Dec 11, 2022 · In this video, I take a quick look at the Mopar 360 J head ports, and share my opinion on them. Alabama. The valves are long stem LS Chevy 2. 02 valve 915 was the T/A. 67valiant Well-Known Member. 8l Engine Cylinder Head Driver Or Passenger 2007 86629. The heads are definitely not the ones that came with the motor as I have set of early 915 J heads from another 1971 340. All small block heads except X, J and T/A $100 a pair Nov 6, 2020 · The 915 # is cast onto the head , the TA heads used the 915 casting But the holes for the pushrods were drilled further away from the intake runner . They are untouched from factory out of a 71 360. May 17, 2014 · May 17, 2014. I had a Nov 24, 2020 · St Paul MN. Had them cleaned and magged good. These were good heads in 1968, but there are better castings in the production head lineup. 02 heads. 02" Intakes would not greatly improve power. 3:1 compression to 8. 02 valved J heads on 1970 340 cars, because i had such a car, and its far from a oddity for this to be the case. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Oct 25, 2013 · silverdale wa. Also included is a ported and matched Mopar M1 aluminum single plane intake manifold. and i dont want coil bind. Most of the later 340 heads & 360 heads had the 1. but with a closed combustion chamber. The 915 was a performance-minded redesign of the big-block head, featuring revised ports while retaining the closed-chamber configuration (typical factory chamber volume of 78. According to 1 source, the 894 "X" head had a 63cc combustion chamber, while the 915 "J" had a 65cc combustion chamber, proof positive it is different! Aug 3, 2023 · Down to the very last 3 sets of 915 J heads 1 used set complete and right of a Car $175 with springs and rockers that look OK to bolt right on. The reason they had the 360 on the ports is that the 360 was just coming out and the changes to the head were charged off to the Oct 24, 2018 · Location. 02 915 J head@155 and 160cc w/1. I have not ported these before, seem to respond differently than 906 heads. Oct 26, 2013. They have thick wall bronze 3/8" guides that checked out good. 020 intake valves in 1970 and 1971. The #906 Cylinder Heads were pulled off and CC'd at 88. Thread starter 67valiant; Start date Aug 12, 2009 - 6. Oct 13, 2023 · Selling a set of J heads. Jun 19, 2023 · Additional service available. 60. 1972 and 1973 340's and all 360's 1971 -1973 with 'J' heads had 1. Nov 16, 2012 · O & J heads all the same, as long as they are "915" heads, they are correct. Dmopower FABO Gold Member. 02 They have good thick wall 3/8" bronze guides and polished chambers. Dec 21, 2022 · In this video we take a closer look at our Mopar "915" J head 340/360 casting. Identification# 3418915. 95. measure them. polished chambers and a light port job. 00 shipping Jul 4, 2018 · The six-pac heads with the pushrod hole machined for offset rockers were 'J' 915 castings in 1970. This video is for new folks to the Mopar sce Feb 20, 2013 · before you take it as gospel that the J heads will lower your compression a lot. you know the Js need a valve job, so hardened seats mill you will have alot into Js. a. 02" intake valves. 88" intake valves and they came to 70. Jan 8, 2014 · X heads were used on 340s from 68 to 70. Feb 16, 2012 · Reaction score. A brief description of 894 X heads, and 915 J heads. The owner let me come in on a Saturday and do some clean up on the bowls first and then do a bit of porting under his guidance. 02 intake valves. 02 intake valves no matter what, the J or 915 casting heads were also used on the 340 six pak motors with modified pushrod holes and then they had 2. If the pushrods are thicker than stock it can get close to the runner & I have had to grind clearance but rarely with stock heads & never with stock pushrods Rockers are left and right not the shafts Jan 27, 2015 · Going to 2. 2. 88 915 J heads. If you have an 'extra $1500, a set of Edelbrock Performer RPM's will do the trick. Jeep Jk Wrangler Oem 3. 84/1. I bought these years ago and have no use for them. Thread starter Dmopower; Start date Jan 13, 2023 - Status Not open for further replies. See details. Good 3 angle valve Set Of Mopar 340/360 (915) - (J) High Performance Engine Cylinder Heads. 02/1. I have never had them apart or checked out by machine shop. The exhaust ports (always weak on 906 heads) were 'D ported' like the D5 hemi head, so flow would have be Jan 4, 2015 · Here's my 2-cents: - The only important difference between 915's and 906's is the combustion chamber size (ports identical or extremely close) - Closed chamber heads are pretty common & the "non-915's" can be turned into "915's" by using the larger exhaust valve (I've done this) - Quench is better with 915's. Dec 30, 2013 · These are the highly sought after J heads #915, for small block mopar 360. Oct 2, 2019 · 3418915C. Jan 25, 2011 · T/A heads had the pushrod hole machined further away from the intake port, but the "pinch" was still there. 60 exhaust valve. 02" intakes for 340s while staying with 1. Two of the heads that came with the blocks I got are cast J but backwards and one is an X and one is a O. Yes, the J heads will be a noticeable increase in performance, especially above 4000 rpm's. I measured the chambers in my virgin unmilled 1973 318 heads and got 66. Dec 4, 2022 · Dec 4, 2022. I tried to get pictures of all the casting numbers in the pictures. Aug 30, 2010 · "J" heads are usually 915's, they use the same size valves and ports as the later 974's, so they're basically the same head. FABO Gold Member. Aug 12, 2009 #1 Jan 22, 2023 · 340 supposedly . 55 Gears and Automatic. 3,071. 73 360 40 over Cylinder Head, PowerPort® 190, CNC Street Ported, Assembled, 1. NEW OEM Mopar Engine Cylinder Head Left 68247775AA Dodge Chrysler 2. casting number on it either on the top or bottom of the head. Jul 6, 2016 · Reaction score. I am not looking for a fortune either. Like I posted in the other thread. Using the rule of thumb that cylinder heads have the potential to Feb 8, 2024 · 915 shared the port shape with the later 906. But that doesn't mean that heads higher on the chart May 28, 2020 · NHRA allows us to use the 915 on 66-67 383 in place of the 516, but must retain 2. having to find a set of 915's then I'd use the 516's. 88 to 2. Intake flow 272 cam at . Jan 1, 2015 · 4,458. The 915 heads are colloquially called "J" heads, as many have a large, >1" letter "J" cast near the spark plugs. Apr 17, 2013 · Hey all Im messing with some 915 closed chamber heads. Yes, the 915 head was used in both a HP version and low perf version. Idaho. 5 cfm on the exhaust side at . They will need rebuilt. 00, and about 40 + hours of home porting work. Saturday, I was at them MOPAR by the Lake show in Cullman, Al and a man had a set of heads with 915 casting numbers but were open chamber small valve heads. 7L 2001-2010. We look at the dampened valve sprin Mar 4, 2015 · The other letter heads "O", "U" , & "J" are standard pushrod holes heads . Last edited: Feb 9, 2024. #1. The L head came from my 67' GTX HP engine with the 1. 1%. Basically the heads are similar to IMM EQs. #10. 60 stainless valves, comp 995 springs, comp keepers/retainers, gasket match on the intake. I've yet to encounter an untouched, original '70 engine with 894 (a. Not my doing) $400 + shipping Jun 5, 2020 · The 452s are open chamber but have a bigger exhaust valve. Get Shipping Quotes Opens in a new tab. 00. I have an odd set of 915 heads. Most Js were 360 heads with 1. 1-year protection plan from Allstate - $127. Casting dates can provide more clues. 30 over 915 J heads- unmolested Crane cam 284 H12 pt# 150062 Eddy Air Gap intake 4spd w/ 3. Jul 9, 2023 · The Hensley 416 that I'm duplicating because of a cracked block had W2 cast iron heads, it was in a 2800lbs car and went 9. All 915 castings were the same overall, just the pushrod hole was relocated and chamber machined for 2. These are not 340 j heads, as they would need to have bigger intake valves installed. 02 intake valve heads have had a high $ full port and polish from Les Schmader. Feb 19, 2022 · Hey Dutchrebuild, I have an identical set of heads that came with a 1971 340 that I bought. C/R increase was from 12. 2. Look for the area around the bolt head mounting faces for dug up or gouging- over tight. As Mike pointed out, 915 heads were also used on 340-6 T/A & AAR E-bodies. Feb 18, 2012. Unless you are running a much bigger than stock cam or running extreme RPM's, the 2. 5cc with NO milling. 0 out of 5 stars ( 4 ) The late Dick Landy was quoted in an article by MOPAR saying his "favorite" readily available cast small block head was the 915 J head with 2. 2990. They will work great with your headers and intake and carb. Aug 30, 2018 · The two locations in which you can find the casting numbers on Mopar cylinder heads. 5 cc) of the earlier Aug 29, 2013 · Elevation of 5600 feet. Aug 12, 2017. The first year for the 360 was 1971; they had 'J' 915 castings. 4, and magnum heads shave . Brand New. We look at the 1. 56 people are watching this. Nov 26, 2016 · Nov 26, 2016. Let me tell ya, a 318 2bbl with 9 to 1 looses to a 318 4bbl, J-heads and headers with 8 to 1. I've seen some slightly inconsistent info but I believe they transitioned from 2531894 heads to 3418915 in or around 1970-'71 so certain ones did have 2. . These heads with a aftermarket intake and carb and headers would be at the 425-450 HP range. Compare (0 of 4) John Deere 915 Combine Heads for Sale New & Used. Asking $275. Shipping: US $150. #3. Some 915's have the 1. Aug 16, 2011 · hey Fabo just started my 360 LA with indy rhs heads and i have a couple issues -err one big issue. Nov 10, 2013 · Sacramento. Joined Nov 2, 2007 Messages 52 Reaction score 0. 600. 9:1 compression or about a 6 horsepower increase. ported. I recommend the 915 J heads because the 587 I run across often are cracked between intake and exhaust valve seats or Exhaust valve to spart plug hole. Jan 26, 2023 · The Original Partstitute. 2268341 – 1962-1967, 318 LA-series small-block, 1. #9. There is not much short side radius on the intakes on the 516 and the exhaust is pretty restrictive. Jun 1, 2009 · After porting, the 906 heads flow an impressive 313. 56 watching. Sep 21, 2007 · Sep 21, 2007. Mar 6, 2023 · Would the Mission Impossible project have a better chance at the hp goals using 360 j heads. Located in: Seneca, South Carolina, United States. 88" for 360 applications. 6 valves. 214 sold. thinking of possible cam change and didnt want to pull heads. So the headers, 915 ported heads and larger valves were good for more than a second and several MPH in the 1/4 mile. Sep 16, 2017 · For Sale- Nice pair of 915 J-head castings for a 340/360. 74 exhaust valve, low perf 1. 30 range. The 915 castings had 2. 3,331. The heads were just reconditioned with a Comp valve job, teflon seals and have double valve springs. 2532080 – 1964-1965, 273 LA-series small-block, 1. I will be at Carlisle Fri/Sat walking around and I usually park at the elemetary school by Gate 1 (Near dealership) PM me for my Apr 4, 2012 · It can also be ported more easily to the 280-290cfm range than the 915 or 906. Feb 7, 2005 · The 340 X heads had the 2. I have headers, performer rpm intake, kb pistons, and a lunati 226/234 @ . Jun 25, 2020 · I found that there are some based on a particular casting number, those are the reinforced version and have stock size ports. Small Block Mopar J Casting Heads 915. Flow trumps compression. These heads are NOt high performance heads but just sime dead stock heads. 08" and 1. When you see what’s indicative of a tag with the screw head on either end that’s the date code. Nov 24, 2020. Members stated above: Jul 19, 2020 · So it's not an A-body but since I got my 1972 D200 with a 360 running it always idled like crap even with a nice 4-bbl conversion and full ignition tune-up. It might be easier to tell what those heads actually are with a photo from the top. That said that’s one funky date code, the likes I’ve not seen before. 14 1. Apr 5, 2024 · Contact seller. Some references say the 915s were 72-up 340 and 360 1. Free 4 day shipping. Plus both heads have essentially the same flow potential. 010 milled off @ 71cc, 1990 302 heads milled . one big change was a swapped out a set of worn 915 j heads and installed a set of rhs heads and used my factory valvetrain - stamped rocker arms, shaft and factory pushrods. 440source (3,548) 99. all numbers and letters are raised cast. 6 exhaust valves. #7. J head cc? Circle Track Chat that's a 915 head, right? My O heads 2. $150. 00 plus the shipping or local pickup. They certainly respond better to porting and bigger valves then the 516s. 88 intake valves and 1. $300. Our reasoning is that we are looking for high flow at higher rpm. 2465315 – 1964-1965, 273 LA-series small-block, 1. 14/1. be is blank and never had a casting number in that area. Oct 12, 2013 · With respect to the #915 and #906 Cylinder Heads. I've personally cc'd and documented 1971 915 heads with . Question ? , what is the maximum safe valve lift on a 67/ 440 -915 head in its stock form. Filter your search results by price & manufacturer with the tool to the left of the listings. 02 & 1. 00, valve job and machine work $325. They are sorted by max intake flow at 0. item 1 Set Of Mopar 340/360 (915) - (J) High Performance Engine Cylinder Heads Set Of Mopar 340/360 (915) - (J) High Performance Engine Cylinder Heads $800. $875. 2 different beasts if you really want to get into it. There should be another 7 digit number that should end in something like 915. My matching numbers 70 340 Duster (B3) had 54000 miles on it when i got it. But the difference is minimal. 11 @ 99. The 915's got phased in to the BB's during '67. 5cc I then installed 2. In 67' K was the VIN# engine designation for the 440 Standard engine. 600-inch lift. There is some factory parts bin scrounging / emptying so one may find these on later years than whats the norm. nothing wild something a step or to up thanks mopar gods. Find new and used Combine Heads for sale with Fastline. Add vehicle. 02 valves in them, the non six pak 915 castings just had the 1. Jun 15, 2021 · Nov 5, 2009. '70 915 J head was a 360 casting, to be used on the '71 360, with pushrod holes machined farther from the intake runners to allow more porting of this area. Neither head has an advantage over the other as a 10:1 915 head and a 10:1 906 head will require a differently designed engine to accomplish the same compression ratio. I picked these up with a bunch of things this summer. I read in the Mopar Performance "A ENGINES" book that pre 72 heads need hardened exhaust seats added, but the 72 & later heads already have them. TAX ISLAND N. Not hard to get 400 hp out of them with the right choice of other parts. $24. Y. 88 intakes, but are the same as the "340" 2. More fodder for the group discussion. I saw someone on the net selling a set of 3769974 "J" heads. Feedback: 2 / 0 / 0. Pulled to install a set of CNC SMs. Are 974's really J heads, and, if so, are these exactly the same as 915's (flow rates, etc. The 915's have a better intake port but for a hot street car you are not likely to notice any difference between the two. 78/1. May 23, 2020 · That’s not the casting number on the head. 02 valve #915 were 71 cc, after . greymouser7 said: Justin ( onewildandcrazyguy ) said he could get over 270 cfm (intake) from these heads. The 68-70 340 X heads were # 2531894. One pair dated 2256 on both also small valve heads. 02" Intakes on the Street with the Comp-Cams XE-268. then i covered the surface with tape to prevent rusting and threw them on the shelf where they Aug 3, 2023 · I have both 915 J heads and 587 Heads with 1. Jan 13, 2023 · [SOLD] Set of 1. 5 to 13. Well last night I was in the process of installing some headers and broke the rear exhaust manifold stud on the pass side head. 880 intake valves, as did all 360's. Curious if the 452s would be more beneficial with the bigger exhaust valve despite a drop in compression or if I should stay with the 915s. $2500 obo Jun 27, 2013 · The heads were pulled from a running motor and placed in my garage. They had 2. Know of others. The 71-72 340-360 heads were #3418915 (as were the T/A Heads). As I understand it, that would mean they were built on February 25th, 1965, but 915's were only produced for 1967. 88 valves when I picked them up. Messages. Is there a way to determine the date, or approximate date, that a cylinder head was cast? I have a pair of 915 J heads. Reaction score. They were laying on his trailer chamber down and I got excited when I saw the paint stick 915 on the ends and really fired Aug 5, 2014 · Dec 9, 2013. The dyno sheets of the original engine showed 623hp @ 6400, so I probably won't twist it higher that 6800. 94 Chevy valve, blend them in your 596's and you have a really good working iron head. 32. gtex_auto (82,019) 99. It is also less prone to cracking around the exhaust valve seat than it's predecessor the 902. 915 castings. 452, 516, 902, 346, 324, 213, 915 casting numbers. Oct 26, 2018 · From what I gather, the 915 J heads aren't going to flow much different than the eddys if machined properly so I've gone ahead and bought a pair for $300. Jan 2, 2015. I was never cast into the head but the area where the casting would. 88/1. 02" intake seat in a 1. My car is 2500lbs with a 408 in it now, hopefully when the 416 goes in it will be in the 9. Georgia. Pre-Owned: Mopar. there are never any stamped numbers on these heads. Apr 8, 2019 · Also look for cracks between the valve seats or seat edge going outwards. Delivery: Estimated between Tue, Apr 16 and Thu, Apr 18 to 23917. Springs, Chromoly Retainers, Dodge, Small Block, Each Part Number: TFS-61417802-C00 5. These 2. 88s while the 71 340s had a different casting. and 2. etc. AAWJ. They had 1. I had new valve seats installed and had them re surfaced, and they coated them in primer. Get the best deals for mopar 915 heads at eBay. 6-61. Aug 9, 2017 · Ohio. 19 MPH. 55 in. All big block heads except 915HP's and max wedge $150 a pair. 360 chambers are usually at least 5cc's bigger than the 318 heads chambers were, and I'd have to say more like 7-8cc's bigger in the real world. The 73-74 340-360 heads were # 3671587. magnums are modern, and in stock form will probably do better than J's. Really need to knock back the short side to pick up flow, and the guide boss is huge!!! Anyways the heads have been opened up to 2. Check spark plug threads. The J head was from 70 to 71. This means that the intake rockers had to be made to compensate too. As cast, the "J" heads (casting #3418915, a. May 31, 2010 · The 596's have some advantages over the 915 J heads. #13. 2,516. 74" Valves, and the car on occasion, is 'Street Driven'. 88 fwiw and based on heads I have and measured. If anything, between 1200 and 4000 RPM's, the 1. Jan 1, 1998 · The 915 was a performance-minded redesign of the big-block head, featuring revised ports while retaining the closed-chamber configuration (typical factory chamber volume of 78. 99. The block is a 1971 but it has been bored 0. If this were a 340, especially a post-71 version with the shorter pistons - I might agree. 010 @ 64cc. Now, maybe y'all can help me out on what I presently know as the J head head-game. 40s. when started Feb 14, 2018 · Feb 14, 2018. 050 cam. May 1, 2020 · polyjohn said: As you can quite easily see, the pushrod tubes are 'non existant' on these heads. 1 one pair with dates 11116 and 11176 small valve heads. 02 / 1. 005 to go down a cc, so that Oct 18, 2010 · 10,230. If the adage is 2 horsepower potential per 1 cfm, then you are looking at over 500hp psycho camshaft potential from your 340 if the right camguy/machinist/builder god blesses your build. 1970-'72s came with J heads. They are worth $200 a pair to me, if not I will keep them. As a rule, X heads are 1968-'69 only. 3 to 1. This chart is a collection of published flow numbers for different types of cylinder heads. I do not see why you could not do the same. Mopar 340 j Heads 3418915 Cuda Challenger Charger Dart Duster High Performance. Js have way better longevity, and porting possiblity. But if you are building a motor the Js nice. Im in Australia and there aren't any machine shops that are familiar with what I need to do Set Of Mopar 340/360 (915) - (J) High Performance Engine Cylinder Heads. 88" valve is 1972 340 and 1971+2 360, J head. 60 that they had on the shelf. $550. 915 J Heads w/ 2. Tjese heads had 360 cast on the ports also. 6" exhaust valve so you need to pay attention when you find a set. 915 J Heads, 2. casting dates are cast on the top of the intake port near a valve spring, abbreviated month day year, hard to see in the pics. #5. In short, a good head for stock to modest performance applications. Aug 12, 2009 · 915 j heads cc. 30 over with the double eyebrow pistons. 88 vs 2. 5. 5%. 00 shipping Sep 6, 2012 · It would cost you more than $350 to rebuild the 906's. 4,458. the 'stock' Cylinder Heads work fine on the street. 02" valves. I believe all J Heads are 915 castings and the head is otherwise identical. Compression is right around 9-1 on my 383 with the 915s. 88 intake valves. 81 new guides on and on, so I have NO flow numbers or paperwork on these, anyways they were never ran he said and set on shelf I took them to my machinist to have magged and no cracks, they Jan 1, 2024 · Freshly rebuilt (1967) 915 heads. People want this. Cost of heads about $300. 5 cc) of the Dec 28, 2017 · X (894) head ports are said to flow a bit better. Video cut short due to fat fingers, will finish with part 2, Thanks Dec 11, 2023 · Both have the "J" down by the spart plug holes but one has no. This is a set or pair of 67 HP 915 heads I bought these from a guy who had the port/ polishing work done and NEW stainless valves 2. 88" Intakes will perform slightly better than the 2. How to identify and what year and engine they were used on. 1967 915 heads, The K head came from a 67' new Yorker single exhaust non HP,with the 1. 60 valves. bronze guides,3 angle valve job. 3418915 with a 1. 12intake,1. I wouldn't get too hung up on that letter at the end. item 2 Set Of Mopar 340/360 (915) - (J) High Performance Engine Cylinder Heads Set Of Mopar 340/360 (915) - (J) High Performance Engine Cylinder Heads $800. 010 @ 59. k. I'm having hardened seats installed, Vinton seals. Free shipping. and the guys working in the foundry did not Apr 1, 2024 · John Deere 915 Flex Head, 15' Wide, New Poly, Guards, Knives One Year Ago, Ran On A John Deere 6620 Combine, Very Good Condition . But they are also called “X” and “J” heads based on the cast letter on the head in addition to the casting number (versions of the 894 head). 56 valves. If your 516's are available and in good shape vs. $149. 1,860. Oct 25, 2018. View Details. 02 or 1. As I understand the '67 383's & the low perf 440's had a mix of the 516 & 915's. 02 valves and the chamber was reduced to 66. Dec 11, 2021 · Was on a thread on facebook forum guys were talking about the different 340 head offerings. 00Standard Shipping. 55 suregrip LT headers 1 5/8 Holley 4150 dbl pump Supposedly steel crank, haven’t been able to confirm if that’s true per previous owner Anyways, suggestions, advice, feedback welcomed, thanks dudes! View attachment 1716038498 Apr 4, 2012 · The year 1967 was significant for Mopar big-block heads with the introduction of the 915 casting, identified by the last three digits of the casting number. 00 shipping. ) Also, are all heads ending in 915 considered J heads? Somebody recently had a set of 915's on e-bay that had Aug 25, 2015 · They are 915 J heads. Location. A 'brand' new GTX with nothing more than a 'general' quick performance tune-up, ran the 'Quarter-Mile' at Milan Dragstrip at 14. Considering how the much sought after, old, worn and remachined 894 heads are over the years, machining a fresh 2. On a 318 you will have to consider the compression ratio. The AAWJ and the cast "J" by the plug hole confirm - J. 915--can also marked I, O, U, or Z instead of J) are actually a scosche better than "X" (894) heads on the intake side, and noticeably better on the exhaust. Omaha. 3418915-C - if you look at the chart below the only 2. 1 cfm on the intake side and 223. OK, I dug the sets I have out this morning. 02 valves won't get you much more. 88 J (915) or newer 360 head will provide as good or better results. #4. 60 valve. Oct 16, 2013 · make a set of 'stock' #915 or #906 Heads work fine, with a little massaging. #18. $800. 81 exhaust,Kmotion springs. Please any advise on my selected parts is appreciated. My heads have 360 cast into them. Sep 17, 2023 · I picked up a set of J heads. 500" lift, which is frankly a completely arbitrary way of doing it. All pairs are assumed to be just cores and you might get lucky with a fresh set that needs little. -----68Fastback I am going to put one of these together this winter and am planning to use it as a sleeper street runner. Jul 17, 2012. 2 sets Hot Tanked or Acid washed plus magged, and pressure checked. which are 179cc intake port 179cc is about 24cc larger than a factory 2. (Sorry about the paint. 74 exhaust valve. Then as long as they all do use cam break in lube on the base, some oil on the sides of the lifter, and re-install them. May 19, 2010 · Dont soak new lifters. 20 to 9. So the date code 2990 comes out as Saturday - 10/4/1970 That would make it a '71' car cyl head. com. 81 valves. They do not have hardened seats. To set the record straight, Mopar did put 2. or Best Offer. They came with 2. 02 J heads. Sep 16, 2021 · Contact seller. 08/1. 1. 020 milled, it takes about . Its not wrong from my experience. 5cc I then measured my 915 J heads with 1. Usually their are two main casting numbers on a 60's Mopar head; the model, and the production date. 60 valves, ported with good valve job True Roller Timing set Old Holly street dominator Carb and other items undecided on. All 1970 340s were supposed to have 915 heads. Just install them with a little WD40 on the sides, mark the lifter and teh bore with a felt tip marker, rotate the engine to make sure the lifters rotate. 50 valves. Buy It Now. Dec 2, 2019 · Here is some numbers from some EQ heads that I bought through my local machine shop in Winnipeg. HP had the 1. NorCal. If the 915's and the 906's were in the same condition, I would guess the chamber size difference in the heads will raise the compression on a 1970 383 from 8. Intake valves have been re aligned to make way for the Ovalport design. As for the others, jegs and speed master. Jul 17, 2012 · Orland Park, IL. So many scare people by compression talk. Feb 21, 2020 · I'll be up front and say that I'm not 100% on the pricing, so make an offer. "X") heads but I'm sure they exist. Over all look at the heads- lots of coats of paint mean possibly they have been on multiple engines. But on this set of heads there is: 2780915 10, and on another area it is stamped 2255. Feb 27, 2021 · There is no "casting number" for T/A heads; the difference is in the machining. 40. They have a flow rate of approx 200/210 cfm. 114. . Save up to 10% when you buy more. This chart will get you in the ballpark. Cylinder Head Comparison. 60 valves with the bowls opened up and the head milled to yield 64-68 cc. ut qk lw wx ge bs nt ck fe eu