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Just some comments after reading this thread that may be helpful. Not trying to be a "know it all", just sharing what I have experienced.


We have a 3700# car, NA, 430ci going 10.0 in the heat and should nick 9's shortly.

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if you don't mind, what is the gear and converter combo your running?

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What lifters and springs are you using? I hope I dont encounter the same problems. I have a set of Manley Nextek springs and a set of lifters out of a 6.1 with about 35K on them.

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stock oem i know nothing about...other than cam and TB these are junkyard parts

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However much power stock parts can handle lol...I have no interest in building a G3 hemi to only go and spend coin on Thitek heads. To me, the appeal of the hemi is how well the stock heads flow, both as cast and ported. Combine that with a good bottom end, and I can't see why 8-900hp isn't attainable.

I do want to stay 5.7 for blocks because of cost and availability....If the 6.4 head is really no good on that bore size, I will save my cash and put some work in to the stock 5.7 heads

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However much power stock parts can handle lol...I have no interest in building a G3 hemi to only go and spend coin on Thitek heads. To me, the appeal of the hemi is how well the stock heads flow, both as cast and ported. Combine that with a good bottom end, and I can't see why 8-900hp isn't attainable.

I do want to stay 5.7 for blocks because of cost and availability....If the 6.4 head is really no good on that bore size, I will save my cash and put some work in to the stock 5.7 heads

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Don't wast your time or money on the stock 5.7 heads. The Apaches are relatively inexpensive and will work on the 5.7 with the proper pistons.

You are going to have a really difficult time getting 8-900 wheel HP out of a 5.7 w/5.7 heads (even with serious head work). I really don't think you will be able to hit that number.

If you can't afford the Apaches try to find a set of 6.1 heads. We made 750-790whp on a completely stock 6.1 at 18psi on C85 - but that is really on the bleeding edge and wouldn't have lasted long.

As far as heads holding - the stock 6.1 mentioned above didn't come apart until 25psi and the factory heads w/factory head bolts and gaskets showed no signs of lifting. The failure appeared to be the stock rod bolts. Again, this is bleeding edge and only an experiment to see what a stock 6.1 could handle. That engine at 14psi powered the Jeep to a [Email]10.7@130[/Email] in Bowling Green - making it the quickest completely stock block Jeep on record.

Buy a set of 6.1 heads used ($900?) and freshen them up. Build a forged bottom or at least a 6.1 crank ($150) and some good rods and pistons. Have PWR spec you a turbo cam and put an 80mm on it. Then you will hit your whp number.

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Just some comments after reading this thread that may be helpful. Not trying to be a "know it all", just sharing what I have experienced.


We have a 3700# car, NA, 430ci going 10.0 in the heat and should nick 9's shortly.

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if you don't mind, what is the gear and converter combo your running?

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The rear gear in the 10.0 car is 3.06 with a 28" tire. Converter flashes around 4000. Car 1.40 60's and is trapping at 135.

To use the Apache heads you will need pistons with valve relief, valve covers and pushrods.

As far as running these on a 5.7 it depends on your power goals. When we had the quickest 5.7 in the MSHS series we were running the Apaches with good results.

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Well, that sucks, my car is a damn turd

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Just some comments after reading this thread that may be helpful. Not trying to be a "know it all", just sharing what I have experienced.


We have a 3700# car, NA, 430ci going 10.0 in the heat and should nick 9's shortly.

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if you don't mind, what is the gear and converter combo your running?

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The rear gear in the 10.0 car is 3.06 with a 28" tire. Converter flashes around 4000. Car 1.40 60's and is trapping at 135.

To use the Apache heads you will need pistons with valve relief, valve covers and pushrods.

As far as running these on a 5.7 it depends on your power goals. When we had the quickest 5.7 in the MSHS series we were running the Apaches with good results.

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What first gear ratio with those 3.06 gears?

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Was it the 5.7 in the trucks that had the mds or is
it the cars... sure is pretty hard to find a 6.1

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Was it the 5.7 in the trucks that had the mds or is
it the cars... sure is pretty hard to find a 6.1

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Trucks got MDS in '06. 5.7 MDS started in '05 in cars. No MDS in 6.1 AFAIK.

Kevin

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Thanks... it looks like I'm gonna have to go with
this truck 5.7 I've been looking at... cant even find
any 6.1s in the area... bummer.... anyone know of
any complete 6.1s within a reasonable distance from
Detroit... been mainly looking at Craigslist

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Here's 4 but probably overkill for your intended purpose.

Nigel is a member here.

http://nationalmoparts.com/c-body-parts?...category_id=447

Kevin

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Yeah thats way more than I plan on paying... hell
I can get a used 6.1 supercharged for less than that
but who knows what kind of shape its in... but thanks

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Well, that sucks, my car is a damn turd

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