304 Compression Ratio Question

[Boost Junky]

the factory comp ratio is 8.4, (VS sII)

if i have the heads shaved:

what is the max that can b shaved off?

& what comp ratio would i end up with?

the motor is currently stock

 

[Boost Junky]

anyone??

i'm thinking of putting in cam, need to work out the comp 1st

 

[GenReaper]

Best advice is to ring these guys as they are local to you.

comeracing.com

They will help you with what you need to know and will help you get the best out of it and a cam to suit your application.

 

[Boost Junky]

thanx m8

was planning on catching up with sam anyway, but hoped to get a few ideas b4 hand

would of thought that someone here could of shared some knowledge regarding

bit dissappointing

 

[Immortality]

depending on the cam your interested in you would need to take a lot of the heads to get enough CR which would lead to a extremely thin fire deck on the heads. not good. best way is to change the pistons.

i'm not 100% certain but i seem to remember that taking off .060" from the heads bumped the CR up to about 9.0 or maybe a bit over.

 

[383 hatch]

Marky, Marky, Marky.....Seriously mate, don't grind a heap off the heads it's the half arsed way to go about raising comp, pop the slugs out and stick a set of flat tops in there. Do it once, do it right IMO.

 

[Boost Junky]

thanx guyz

Tim, i'll take yr advice & throw sum slugs in (& a crank maybe), cheers

appreciate the input

 

[Reaper]

Marky, Marky, Marky.....Seriously mate, don't grind a heap off the heads it's the half arsed way to go about raising comp, pop the slugs out and stick a set of flat tops in there. Do it once, do it right IMO.

I've said it before and I'll say it again - Commodore owners and half arsed are like peas in a pod. Junky - whack your heads on the surface grinder and carve off 1/2 an inch or so :thumbsup:

Reaper

 

[Boost Junky]

I've said it before and I'll say it again - Commodore owners and half arsed are like peas in a pod. Junky - whack your heads on the surface grinder and carve off 1/2 an inch or so :thumbsup:

Reaper

haven't got a surface grinder, might just use the ol hacksaw