440 cylinder heads
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ta3834bbl
68 cuda 383 project
Same heads I'm using, they work well. I put the 2.08 / 1.74 valve with hardened seats in 'em and I'm satisfied. I'm told they are now very close if not the same as 915's but I'm not sure. just putting my .02 in. they are definitely 516's in the picture.
demon seed
The Original Demon Seed
516 heads with what look like the small (1.60") exhaust valves. There's a lot of head material between the valve heads.
http://image.moparmusclemagazine.com/f/9535672/p39424_image_large.jpg
See, bugger all for material = large (1.74") exhaust valves.
Sorry to be a PITA but accuracy is important when it comes to BB heads as there are quite a few casting variations out there curtesy of Mother Mopar.
http://image.moparmusclemagazine.com/f/9535672/p39424_image_large.jpg
See, bugger all for material = large (1.74") exhaust valves.
Sorry to be a PITA but accuracy is important when it comes to BB heads as there are quite a few casting variations out there curtesy of Mother Mopar.
Pro-Cuda 68
Member
Sorry, Thought they where 915's
1wild&crazyguy
Banned
different intake port cast, can't get ported what you can from a 915/906.
they have 1.60 ex valves.
good luck
Pro-Cuda 68
Member
Since they are 516's is there any value, or should they be used as a boat anchor.
1wild&crazyguy
Banned
they are in a grey area, good for a 361/383 stock rebuild, but not desirable for performance in this condition.
superbyrd
Well-Known Member
these heads are a great,low cost adition to a low compression,cast crank 400 or 440. these will bring one of the .115 in the hole piston engines to a solid 9.5 to 1 to 9.7 to 1 compression ratio dependent on which headgasket used. not the most performance oriented set-up according to alot of "experts" but, they work very well waking up a smog-era motor for next to no dough.
No, they won't. The low comp engines like the 400 blueprinted out at about 7.6:1. These heads will only bring that up around one full point and that's all.
EL5DEMON340
Well-Known Member
i replaced a set of 906 with a set of stock valve 915's 1.60 exh valve on a 383 hp, the 915 chamber is the same as the 516, they raised my cr about .8, when you replace the valve to the 1.74 and go with a valve that is not concaved the CC's on them drop a good bit. then you will get 1 to 1.2 increase in CR.
No, not at all. I just wanna make sure they get information, not misinformation. So lets see, even takin EL5DEMON340's best case scenario of a 1.2 point increase, IF we blueprinted at 7.6.....I've seen as low as 7.2, but if we're at 7.6 plus that 1.2 we only get 8.8. That's a far cry from your "expert" 9.5 or 9.7. Have you ever blueprinted compression on a 400? I'm gonna say no.
THAT my friend is probably a dead nuts on estimate.
nqkjw
Well-Known Member
I replaced 906s on my 440 with 915s fitted with 2.14/1.88
Had 40thou composite gasket with 906's and was reassembled with 20thou tin shim gaskets.
All cc'ed accurately before and after.
Before was 8.4:1
After was 9.3:1
Had 40thou composite gasket with 906's and was reassembled with 20thou tin shim gaskets.
All cc'ed accurately before and after.
Before was 8.4:1
After was 9.3:1
superbyrd
Well-Known Member
yes indeed,stroker,good whatever racin,,20+year journeyman toolmaker/machinist/welder/fabricator/metalurgist, pick your poison,been doing this a while,so yes,have blueprinted half a dozen 400's,the current one in my 67 coronet 2-door sedan,was 8.24 to 1 corrected,static compression. after installing .020 shim gaskets,and a set of untouched 516's, it is a correct 9.55 to 1.
not every engine will be the same as much as chrysler varied,nor was i saying you are going to build a world turner with it,but they sure do a good job of waking up these supposed "boat anchor" motors that everyone wants to dismiss.
as stated,a cheap upgrade,individual results will vary.
for the record,without the "so and so racin" experts,the magazine gurus,and other assorted know-it-alls, my coronets combo, low-mile 74 400, unported or cut,stock valve 516's,performer RPM,750 holley,comp XE268,cheapie summit headers,2 1/2" duals,h-pipe,40 series flows,727 with 2400 converter,8 3/4 with 3.55's,running on 235/60/15 BFG drag radials,3600 lb. car.over 75 timeslips, ranging from 12.94 to 13.10.over 3 years of running with out as much as a re-tune.
sure is a good thing these heads don't work.......
and, whole engine cost less to build than just a set of stealh heads...............
not every engine will be the same as much as chrysler varied,nor was i saying you are going to build a world turner with it,but they sure do a good job of waking up these supposed "boat anchor" motors that everyone wants to dismiss.
as stated,a cheap upgrade,individual results will vary.
for the record,without the "so and so racin" experts,the magazine gurus,and other assorted know-it-alls, my coronets combo, low-mile 74 400, unported or cut,stock valve 516's,performer RPM,750 holley,comp XE268,cheapie summit headers,2 1/2" duals,h-pipe,40 series flows,727 with 2400 converter,8 3/4 with 3.55's,running on 235/60/15 BFG drag radials,3600 lb. car.over 75 timeslips, ranging from 12.94 to 13.10.over 3 years of running with out as much as a re-tune.
sure is a good thing these heads don't work.......
and, whole engine cost less to build than just a set of stealh heads...............
1wild&crazyguy
Banned
you built a big block from scratch for only $989?
That's probably accurate, that's a 440. I was talkin about the 400.
So?
"Corrected"? There's nuthin to "correct" for. Static compression ratio is a physical measurement. Either you have "X" compression ratio, or you don't. It's that simple. Sorry, but either you didn't know what you were doin or you're a liar. I'm leain toward the latter. No 400 EVER blueprinted at 8.2:1 from the factory. NONE. Get your nose out of the online spec book and stop sp[ewin crap because you're WRONG.
Well sure. Those heads are capable of raising compression. More compression equals more power. They don't raise compression anywhere near what you think. PERIOD.
It could do that with a stock compression 400 with the right bolt ons. Stop spewin. It's not workin for you, especially when it's WRONG.
Oh and if you wanna keep up the stupidness, start another thread. This is the for sale section. Don't know why I let you suck me in this far with your "expertness".
Pro-Cuda 68
Member
Superbyrd give me a shout if still interested. Tom 215-813-8409
From Bensalem PA 19020 I do have the availability to ship!
From Bensalem PA 19020 I do have the availability to ship!
Pro-Cuda 68
Member
Call me if interested Tom 215-813-8409
From Bensalem PA 19020 can also ship
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