LS3 Carbed build

General engine tech -- Drag Racing to Circle Track

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In-Tech
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Re: LS3 Carbed build

Post by In-Tech » Tue Dec 11, 2018 4:33 pm

Hiya, just to chime in with my opinion. Iron block aluminum head I usually shoot for .015" - .020" preload on my high rpm hyd roller LS stuff and .010" more for alum/alum. So far it's worked well to 8000 rpm.
To each his own, just passing on some experience. Having non adjustable obviously needs the stem heights to be as close as possible and I don't get crazy ordering lot's of pushrods either, most turn out fine with 7.350" pushrods.
Nice build, btw.
Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl

202ci EH
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Re: LS3 Carbed build

Post by 202ci EH » Wed Dec 12, 2018 5:17 am

Thanks for those 2c In tech
That's like 1/4 -1/2 turn of preload, is my math right? ( will be setting it with a dial indicator of course)

CGT,

they are 2.05/1.6 . 2.5" mcsa intake / asthmatic 1.3 sqin ex :lol:
I wll update it all when I get further along, busy collecting parts and doing rust repairs/fab at the moment.

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Re: LS3 Carbed build

Post by CGT » Wed Dec 12, 2018 11:23 am

In-Tech wrote:
Tue Dec 11, 2018 4:33 pm
most turn out fine with 7.350" pushrods.
That is very unlikely with this build to be the correct length. Thanks for the input on the preload.
"If you pick up a starving dog and make him prosperous, He will not bite you. This is the principal difference between a dog and a man"

steve316
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Re: LS3 Carbed build

Post by steve316 » Sun Feb 10, 2019 11:45 pm

how is the build progressing

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Re: LS3 Carbed build

Post by CGT » Thu Feb 14, 2019 9:17 am

steve316 wrote:
Sun Feb 10, 2019 11:45 pm
how is the build progressing
It's been at a standstill. I've been tinkering with the budget vortec build(I have a thread somewhere on ST on it)....wrapping it up and getting it dyno ready. The LS3 heads and the CID manifold are out your way(Rosendale). But should be returning shortly.

Not a ton left to do on it honestly, at least not for it's first voyage. 8) . Valve job, some measuring to see how much I can cut the heads and that's about it. Of course stuff always takes longer than it should and unforeseen stuff always arises... you know that. #-o How is the SB2? I have a cam for a Windsor I need to order from you btw.
"If you pick up a starving dog and make him prosperous, He will not bite you. This is the principal difference between a dog and a man"

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Re: LS3 Carbed build

Post by steve316 » Fri Feb 15, 2019 9:29 am

Rocker arm ratio & carb change on SB2. Been out of town; just let me know on cam.

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