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Old 06-05-2010, 08:28 PM
quadrajunk, best junk there is
 
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Pontiac 6X-8 Heads

I have 6x-8 heads on my 400 now and am going go the smaller chambered 6x-4 head. Is there any reason to keep the -8 heads? Would they go good with a super charged 400?

BT

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Old 06-05-2010, 08:44 PM
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the 6x-4 is a smaller chambered head will rase your compression to 8.1:1 they origanially came on the pontiac350 91cc i belive some say 93.74 but i think thats a load of bull you will notice the diffrence and yes the-8 heads are low enought to run a supercharger but i dont know how much boost you would want to run probally want to run a -.005 dish piston if supercharging.
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Old 06-05-2010, 09:22 PM
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Quote:
Originally Posted by Drake
the 6x-4 is a smaller chambered head will rase your compression to 8.1:1 they origanially came on the pontiac350 91cc i belive some say 93.74 but i think thats a load of bull you will notice the diffrence and yes the-8 heads are low enought to run a supercharger but i dont know how much boost you would want to run probally want to run a -.005 dish piston if supercharging.
My -4's were 95cc before any work, came on a 400.

A 0.005" dish won't affect the CR enough to matter.

As for what to do w/the -8's, I'd hang on to them; you never know what might come up- unless storage space is tight. YMMV. At least strip them down before you toss them.

They might be usable on a boosted 455 or stroker, but then you'd really want better flowing ports, and aftermarket would be the way to go.
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Old 06-05-2010, 09:55 PM
quadrajunk, best junk there is
 
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As a side note my -4 heads were milled .040" so that should give a little extra CR & a three angle valve job. I guess I will keep the -8 heads in storage for now.

BT
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Old 06-20-2010, 10:02 PM
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Put them on a 455.
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