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which size cylinder heads ?!

This is a discussion on which size cylinder heads ?! within the External Engine forums, part of the LSx Technical Help Section category; Originally Posted by Camarosseasttn I'm wondering what will be a good gear ratio for the new rear end with 28" ...

  1. #21
    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by Camarosseasttn View Post
    I'm wondering what will be a good gear ratio for the new rear end with 28" slick ? It has a built 4l60e with a 3600 stall .
    I would stick to something in the 3.55 to 3.90 range. There are a lot of variables to consider. I have a max effort NA (for now) 421 ci Lq9 with a fast 102 trickflow 255 Ls3 heads and a 249/262 duration cam and my rear gear is 3.55. I also have a built 8.8 rear with a built 4l60e and a 4000+ stall. A lot of it comes down to the speed and rpm you want to be trapping at as well as the tire.

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    If you don't mind me asking what kinda HP or ET is ur car gunning since it's a 421 lq9 ? Sounds like a bad ass setup

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    Quote Originally Posted by Camarosseasttn View Post
    If you don't mind me asking what kinda HP or ET is ur car gunning since it's a 421 lq9 ? Sounds like a bad ass setup
    I haven't run it yet or had it dyno'd the engine is currently out of the car right now. However I've been told by a few speed shops while it was getting built that it should be running 10s but I we see for sure soon enough.

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    I don't doubt it a bit if it's a good combination

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    Quote Originally Posted by Camarosseasttn View Post
    I don't doubt it a bit if it's a good combination
    Yep same I've had everything in the build matched with everything. Anyway, what rpm and mph do you want to cross the line at?

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    I honestly don't know what RPM I would like to be at, I'd just like the best setup to net me the best ET in the 1/8 mile? I'm guessing he I'll be around 110-120 mph ?

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    Quote Originally Posted by Camarosseasttn View Post
    I honestly don't know what RPM I would like to be at, I'd just like the best setup to net me the best ET in the 1/8 mile? I'm guessing he I'll be around 110-120 mph ?
    What is your power band typically you'd want it to be towards the end of it.

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    I know it seems to like upper rpms it shifts at 6500 rev limiter is 7200 ?

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