Likely a set of dart Iron Eagle heads with 72cc chambers and 180cc runners with 2.02 1.60 valves. the humps would have to be ported pretty good, along with the valves installed, they`ll likely need valve guides and the studs replaced with springs, locks, retainers, the works and your looking at about $800 unless you can port them yourself and get the proper results and this isn`t counting what you paid for them to start with, it just makes better sense and cheaper prices just to go with a aftermarket head. if you find a set of ready to go double humps then you could have them bowl ported but you still likely won`t reach 425 horses, more likely 385. also comes down to what pistons your running since the double humps have 64cc chambers and with flat top pistons in a 383 will put you over 10:1 compression which won`t survive on pump gas if this is street intended.
Oh you can push much higher than 10:1 on pump gas if you do it right. I know a couple of guys pushing 12. Lluciano77 uses 11.5 on 91 octane because he lives in cali!!!
I`m well aware of that killer, but I`m not going to take the time to explain it all on how to run that kind of compression on pump gas to a 16 year old and hope he understands it.
look just because i am 16 does not mean anything i know alot more about cars then just normal people do so dont put me down like that just cause i ask questions about heads does not mean anything. all i want is an anwser to my question and actually i prolly would understand the thing about the gas
it`s not a put down to say I wasn`t going to explain it to you when there`s lots of books and articles out there that can teach you and tell you a whole lot better than I ever could in just a posting.
Ya its usually better to air on the side of caution with compression ratio's especially if you havent had a whole lot of experience. Most the guys that manage to run high static comp ratio's on the street have though out the combo very carfully and often had to do some trial and error. There isn't a whole lot of power to be gained from for example going from running high compression ratio's either although it does help restore some of the power at low rpms when running a cam with alot of duration
Yea,10 and above your pushin it and ya better know whats up after that,383 motors build great torque but don't spin well unless your wallet is fat. I would run 10 or less with a cold thermostat ,curve the distributor,cold plugs,and either settle for 375 with big torque or build something else , unless your loaded. Still not enough info.Sorry.
I think I'd have to disagree. Sure stroker motors aren't the best rappers, but if you ballance a motor (which you must do with a stroker) you can push 55-6000. I also am positive you can make well into the 400 horse range with a stroker, you just need decent heads and a good cam. You can even use a stock botom end up to 500 HP no problem. Stick with a duel plane intake and you're cool. You don't need a fat pocket book. That's the reason 383's are so popular, they make great power and they're cheap.
500 horse on a stock bottom end ,yea,sure for how long,one run. Better take the money you saved and buy a good scatter shield to protect you from the turned down cast crank .400 ,yea ,Ill bite but come on.
The small blocks chevs and very strong bottom ends even in 2 bolt main form, a cast crank and a set of reconditioned rods with high quality rod bolts could easily survive making 425. That seems to be a mistake alot of people make. they spend way to much money on after market high priced pieces when its the necisiarry and sometimes won't even life as long as stock pieces will.Don't ever under estimate stock parts
500 horse on a stock bottom end ,yea,sure for how long,one run. Better take the money you saved and buy a good scatter shield to protect you from the turned down cast crank .400 ,yea ,Ill bite but come on.
You obviously dont know WTF you are talking about. The crank is not turned down .400. If you are going to give advice, at least do some homework first. I could tell you what the numbers are, but it would be a good excercise to find out yourself.
The stock parts should be fine on the 425 HP range engine. I would also not just toss the double hump heads. They make great torque and are killer street heads. I have a set that are pocket ported and gasket matched on my 400 SBC. I run a pretty fat cam to help make up for the flow on the heads, and it is a very respectable engine. I have never dynoed it, but I would put it in the 375 HP range or maybe a little more.
RE: camel hump heads. In the mid 60's some of the 461/462 FI heads did come with 202 intakes. The casting # was the same as 194's. Alternatly, lots of shops would grinds a set of 194's to accept 202's.
With these parts you can make that kind of power, but
the camshaft to make it all happen would not be a good
streetable piece. I would suggest getting a set of 200 cc
heads with 2.05" valves. These heads are large enough
and flow enough air at low lift to use a mild camshaft.
This would get you to your goal much more cost effective.
yeah forgive me if you thought I was knocking hump heads, but I think you're making the same point I was. I don't think you're going to be in the 400 horse range with them, that's all I meant.
They should make good torque in the lower rpm range, up to the torque peak anyway. This is not necessarily a bad thing if you are wanting a good stout street motor. At some point in the upper range of rpm's, the intake ports will stall and the motor will nose over. Most of those double hump heads are around 165cc's intake runner volume, while you need somewhere around 200cc or a little larger runners to support a 383 to 6000. If you're going to limit revs to under 5000, then the humps will work fine. It won't be a race motor, but it will make good low end torque to pull a heavy car around town.
Not all posts to old threads are a bad thing, but in this case it's a waste of time and space IMHO.
There used to be a line of red font text that popped up if someone were to try to post to an old thread. Can it be reinstated?
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Hot Rod Forum
2.2M posts
175.6K members
Since 2001
A forum community dedicated to hot rod owners and enthusiasts. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!