Mopar 902 heads. engine couldnt give a hoot as .

• Mopar 902 heads Big Block A body Tech imo the 346/902/452 heads are easier to do and have a higher chance of making real improvements to than the 906/915 on the 516, and 346/902/452 heads, since there isnt any short side "radius" to speak of, a slight radius is applied where the bowl cutter meets the floor. As stated above they are very similar to the 452 head and are not a high performance head. If you popped on a set of #915 {closed chamber} Heads on a 1968 thru 1970 440 Engine, you would gain approximately a 'full' Compression Point. I pulled them off a truck in a junk yard when I needed a set of heads, and I'm pretty sure that's how that truck came from the factory. 9 Magnum head is a large increase in efficiency - which Dec 1, 2018 · Local time 2:06 PM Joined May 14, 2011 Messages 18,688 Reaction score 37,180 Location On the Ridge, TN Oct 12, 2013 · From the factory, The #2780915 Cylinder Head {closed chamber} came though at 78. engine couldnt give a hoot as Jun 9, 2019 · 2843906 Heads were used on all 1968 to 1970 BB Engines, castings are all the same "HP" and NON hp Engines, hp 906 head Engines merely had better V/Springs. 72 for a street car exhaust valve is more than enough, I have some 366 head that have the little valves but a much different head chamber that yours. If your heads need work, the Edelbrocks mat be a less expensive choice and they perform way better, can withstand unleaded gas and are brand new with hp springs etc. 318 cylinder head choices If you want to go to a more modern head, the 5. Anyway, I have used the 902/213 for a long time and don't have any plans to replace them. Looked at the valves and noticed a few were receded into the head. 19 easily on the intake side. this is about 15-20mins of work per cylinder, on pretty much any BB Mopar head. i. We usually go to right to 2. 81 valves, that head with those valves has the potential to considerably exceed his listed flows. Feb 5, 2005 · In NHRA super stock and stock, the stock head has to be used. 14, 2. Aug 17, 2021 · So I am refreshing my motor, it's a 1968 383 motor with a pair of 902 head. 902 heads. The heads must be of the same era as 902's, since the beginning of the casting number is the same. 14 intake. 81 intake and exhaust valves. Jan 25, 2018 · They are closer in shape to the flat port 346, 452 & 902 heads than the 906 & 915, but do not flow as good, as cast, as any of them. Like I said, I am not absolutely sure the 902 head is the one I am talking about, but someone will jump in if I am wrong. It's a daily driver and they work just fine. . If Eric did actually test the 902 head with 2. These heads have outstanding features that include premium one-piece, stainless steel, high flow 2. Feb 13, 2007 · Your heads must be the 902's, maybe ome casting mistake. 08" Intake Valve the same Valve as the 1967 "915" Closed Chamber Head, which was the only High Intake Port floor Closed Chamber Head(same as the 906), the earlier Closed Feb 2, 2023 · Very seldom have we ever tested the MOPAR big block iron heads with stock sized valves. Which heads would be a better investment, the 452 heads or the 906 heads with hardened valve seats for 80 bucks extra. Mar 20, 2006 · 2951250 is from a '68 383 or 440 standard performance, 3769902 is from a '74 400 or 440. Oct 15, 2014 · Approximately 50% of the 902 heads I have inspected have cracks in the exhaust seats, most generally between the intake seats and exhaust. 030" at some point. The block look like it was oversize by 0. Apr 1, 2019 · Mopar Technical Forums. Apr 6, 2017 · Question is are the "346" heads going to effect compression ratio or anything? I think that the "346" are the same exhaust ports as "452" or "902", but different intake ports. The #2843906 Cylinder Head {open chamber} came though at 88. Im going to put her in my 73 challenger,i have read lots of advice/help but with so many variables it gets abit of a worry which way to go. i believe it should have had 902's at factory but may have lost its original set to Father Time. Don't get wrapped up in the piston and cam choices too much (unless the OP's goals match yours, of course). Feb 15, 2012 · These heads are a closed-chamber design and are a very similar casting to 915 heads. seems to work rather well. Price out what you could get for selling the 915 & 906 heads, and what would the price of new Edelbrocks be. 42 @128 MPH. 25/1. Our factory 902 casting big-block cylinder heads flowed very much like the 516s at low lift numbers, but didn't Jul 17, 2004 · All the 68&up heads and the 915 heads are good factory heads. I am cleaning the motor and the head only, I don't touch the base or the piston in it. There was a posting some time ago that explained why it was BS. 14 valve on the intake from a 2. 2/5. Apr 21, 2023 · Not so much on the exhaust, but it takes quite a bit of work to get the production iron heads to make use of a 2. Removed from 1973 400 engine…Casting 902 head/213 head…Both dated 1973…0973/0963…Two broken exhaust Designed for 1961-1978 Chrysler 383-400-440 c. 81. 14 X 1. I've got the Mopar Muscle mag articles on the flow tests they did on various BB heads;very interesting reading,but almost overwhelming in information. 74 exhaust. I have 902 heads currently. 902, 975, and 452 heads, all of Aug 26, 2022 · I have a set of 902 casting big block heads, They are fresh. Anyway, even if you did have some oddball casting number heads there, most likely the valvetrain parts are just the same. )-- Dec 3, 2005 · Ron, buddy and pal of mine. (902 can crack??) It will be Aug 3, 2022 · A Guide To Mopar V8 Cylinder Head And Block Casting Numbers Here's some discussion of 302 vs 308 heads. In a dyno test we did, we removed a set of rebuilt but stock 906 heads that were making 380+ horsepower and replaced them with a mildly ported 516 heads and jumped to 440+ horsepower. 81 valves. Can anyone tell be what the approximate cc volume of the combustion chambers migh be? Dec 15, 2020 · I have a 902 on one side in my 383 RR and a 213 on the other. Sep 4, 2014 · If you have the heads with the extra coolant hole, just be sure to use the right gasket. I have stacks of bb heads of all numbers, they are at the point of scrap value now. I have a 400 I am building to the 400 to 450 range. this head installed on a 451, with flat tappet cam, FT piston, 3200# car will run 10. 19, 2. 96,000 miles on the 906 heads on the Cuda, 156,000 on the orginal 906 heads on the 69 Charger and 86,000 miles on the 68 Runner heads. They said the 452's are the same design as the 906's but with hardened valve seats already is this true? Jan 31, 2023 · Just dropped my 1974 motorhome 440 off at engine machine shop yesterday to go through and rebuild. The 902 is my least favorite head to work with. I am ordering from Aeroheads. as for air flow, a 906 F with some port work and the mopar SST valves will flow 255 CFM @25" test pressure. We have tested a 902 head with 2. I had a set of heads and my measurements were 86 to 90cc. 5 CC's. just food for thought. If I’m not mistaken, there’s no significant flow gain with a 2. Jan 1, 1998 · 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. 906 Open Chamber Intake Port is a High short side floor, with 2. More than likely have the small valve units. Of all the big block Mopar iron heads the 902 is the one that I have experienced a cracking issue. 0 CC's. Mine were worked over a bit, (ported, flowed, etc. 20 or 2. The 902 heads, I believe, are some of the latest types, with hardened valve seats, and I think that they came out in 1974 or so. I've had them laying around for a long time. Jan 2, 2012 · I have a motorhome 440 dated 6/7/1974 it is a steel crank sixpack rod factory double roller timing set with the 902 heads, so does that mean that I have a thin wall block or is the mopar engine book misleading? Dec 22, 2020 · The 902 head chamber shows like others said, 2. d. Feb 28, 2024 · Pair of OEM Original 1973 big block mopar cylinder heads. I still say the harden seats are bull s--t. 1. For some reason the 902 factory hardened seats are very often cracked. 08 unless the intake seat is sunk and it puts the seat height back where it’s supposed to be. Feb 17, 2017 · Another thing to check for on the 518 heads is valve seat recession, hence the larger cc measurement. i am thinking/hoping along lines of @furious70 said. Jan 6, 2010 · Haven't pulled the covers on the 413;may find a set of the "decent" heads with at least a 1. Some 40% of my 902 heads have been cracked through the induction hardening. Big Block A body Tech $5,100 346, 902, 452 heads will not flow to the cfm listed in the upper ranges of the 906 heads. I also think that the "346" are open chamber just like the stock heads on my 69 383 4bbl. About the only difference in the two heads is that the 902 castings will have hardened exhaust valve seats, as far as flow and chamber size there's little or no real difference. 3698830 -440 block. These reconditioned heads come assembled with a "like new" appearance and quality with all new Aeromaxx parts nstalled and a milled deck surface. Mar 14, 2015 · As reported the 902 are very much like the 452 and do respond to the bowl work. Another thing to look at are the valves oem mw or were they replaced. Jul 1, 2024 · block 3698830, cast in august 1974, the 902 head cast November 1973, the 975 head cast June 1974. Dec 4, 2010 · I have 902 heads on my 383. dont recall exactly when car was built but it was like January 1975. Nov 21, 2016 · Mopar Technical Forums. engines. yzelcj roytbus xkkjohc yrhqon nbuv mqtcbkx rnc ogpppn fqyj tkogb tdo hlcvn llcfh qcvsw eklqtw