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So, if I find a 6.1 block I can run 6.4 heads with no issues?

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Well, that sucks, my car is a damn turd

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If I read correctly you said you've only been to the track once and your car went 10.0? What MPH? What was your 60'?

Depending on the compression your getting with those heads and pistons I would think at your weight you should be in the high 9's but if your compression is low enough then maybe not.

I'm not familiar enough with your intake/induction as far as track testing to make a call on that.

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I'm still trying to get a feeling on these gen 3s...
what kind of compression are most running.. both N/A
and boosted... from what Rick said on his, I have a
feeling a person can go pretty damn high on pump fuel

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I have only been once. I use to be able to go a lot years ago, but I just don't get to go as much anymore.

I was thinking my problems are just the gear in my car.

I would like to hear the motor combo of the 3700 lb car about to go 9s

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430ci, 15:1 compression, Thitek heads, Thitek ported 6.1 intake, 90mm throttle body, PWR designed cam, NAG1 trans, 4000rpm flash converter, 3.06 gear, trans brake, 28" MT ET Streets, custom tuning on our dyno and at the track. Car has run many types of fuel - E85, C16, Q16, C45 - it seems to like the Q16 and C45 the best. The best thing is that this is a 4 door former cop car with a column shift!

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This pic is of a stock replacement 6.4 piston from Manley
http://www.southeastrt.net/images/597400-main.jpg
This is a pic of my Manley's which must be an older design.

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Nice! I love the thicker ring land!

Here's mine installed in my 5.7 block:

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This pic is of a stock replacement 6.4 piston from Manley
http://www.southeastrt.net/images/597400-main.jpg
This is a pic of my Manley's which must be an older design.

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Nice! I love the thicker ring land!

Here's mine installed in my 5.7 block:

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mine

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This pic is of a stock replacement 6.4 piston from Manley
http://www.southeastrt.net/images/597400-main.jpg
This is a pic of my Manley's which must be an older design.

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Nice! I love the thicker ring land!

Here's mine installed in my 5.7 block:

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Looks bad to the bone Mike, the pics I brought up to show mainly the difference in valve reliefs between the 6.4 Manleys, my 6.1 Manleys, Ray's Diamonds and also your 5.7 pistons. Mine are pretty conservative valve reliefs in comparison.

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mine

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Ray what is your static compression?

I'm guessing right at 11.0:1?

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it is. with the Apache head it will drop to 10

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30 psi? Turbo or blower? Would love to hear about this motor...

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mine

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Ray what is your static compression?

I'm guessing right at 11.0:1?

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it is. with the Apache head it will drop to 10

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maybe I can get it into the 9s on 87

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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.

- The Apache heads will fit on a 5.7 block
- Another alternative for good heads is Thitek
- The 5.7 block is a cheaper and more readily available alternative.
- If using a truck 5.7 block you will need to account for the different dipstick location and if using a pan with a dipstick tube you will need to plug the dipstick tube hole in the truck block.
- If using a 5.7 truck block and a 6.1 timing cover and AC you will need to drill and tap 2 holes for the AC bolts in the block.
- To delete MDS just replace the lifters. You can leave the MDS components in place - no need for plugs.
- These engines do not like a lot of timing so be careful.
- Stick with fuel injection and a 6.1 intake for most applications.
- NA or forced induction they can make a decent and reliable HP#

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

We also have a 5300# Jeep, turbo, 370ci going high 9's and daily driven.

These engines are impressive and I can't wait to see when someone really starts pushing them!

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