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best heads for boosted 5.3

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Old May 14, 2021 | 03:20 PM
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Default best heads for boosted 5.3

I building another boosted 5.3 and was wondering what heads everyone would go with.I will be running 20-24 psi and own 799,243,706 and 862 heads.I run a stage 2 turbo cam with gen 4 pistons and rods.
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Old May 14, 2021 | 05:00 PM
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Boost don't care it's forcing air but the 706/862's get's my vote.
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Old May 14, 2021 | 06:10 PM
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What fuel?

The 706/862 are probably the correct option, but lowering compression with 243/799 heads may be somewhat helpful if you aren't using a good fuel.
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Old May 14, 2021 | 06:12 PM
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243/799's would be my first pick if you have flat tops
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Old May 14, 2021 | 07:42 PM
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im running e85
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Old May 14, 2021 | 07:42 PM
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Originally Posted by V8sounds
What fuel?

The 706/862 are probably the correct option, but lowering compression with 243/799 heads may be somewhat helpful if you aren't using a good fuel.
im using flat top pistons.
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Old May 15, 2021 | 07:20 PM
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706 heads get my vote. Coefficient of discharge!
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Old May 15, 2021 | 07:32 PM
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Originally Posted by joes1966
im running e85


Last edited by 01CamaroSSTx; May 15, 2021 at 07:38 PM.
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I was going to say the best heads for boost are the ones you already own...LOL. Of the ones you currently own I'd guess the 706 on the 5.3 will be the best since you have no reason to lower compression.
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Old May 17, 2021 | 12:50 AM
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Originally Posted by joes1966
I building another boosted 5.3 and was wondering what heads everyone would go with.I will be running 20-24 psi and own 799,243,706 and 862 heads.I run a stage 2 turbo cam with gen 4 pistons and rods.
I’m at 23lbs on E85 with 243 heads, no problems.
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