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Discussion in 'High Performance Modifications' started by slamdik, Nov 21, 2007.
With 76cc heads, you'll definately need domed pistons to get 10:1 comp.
and if your running nitrous, start thinking about forged rods, arp rod bolts ,
forged crank too. It'll be cheaper to buy good parts to start with, unless you
enjoy frequently disassembling and rebuilding your engine..............Oh and
with domed pistons, make sure you check your valve to piston clearance or
see the previous sentence............Good luck !!!!!!!!!!!!!!!!
He said forged crank AND all Chevy V-8's have forged rods!
As for 10 to 1 CR, a stock L-48 engine is 10.25 to 1 CR'd and more like 10 w/ 64 cc heads, -5 cc 4-notch flat-tops and .020" thick steel shim headgaskets!!
I'd ditch your heads and find one's w/ right at 64 cc's or whatever your bore end's up making your CVR turn out to!
Then use true flat-top forged pistons and go!! I say this b/c a small chamber and flat-top pistons create a much better eff. combustion vs domes where the flame front has to go around a big dome unless you really know what you are doing.
Of course rebalance her too!
And I would use good rod bolts too like Dude said.
Whoops................Dropped the ball on that forged crank and should've said good quality forged rods like "I" beam or "H" beams. I would agree with the smaller combustion chambered heads too about 64cc with a good (forged)
flat top piston would make more sense to me too. Je makes a good lightweight piston..............ask me how I know...................
First off thank you guys for the quick replys.
I realy don't want to "ditch" my $1400 AFR's.Can they be milled?
What's the difference between a "true" flat top and a "false" f/t?
AFR's website has a contact link to email them. They should be able to tell you how much, those heads of your's can be milled. Bear in mind that if you mill them, it may also require you to mill your intake manifold so that everything lines up when you bolt it together, otherwise you could end up with a vacuum leak where the intake bolts to the heads. I'll have to refer you to pdq for the difference in flattop pistons...................Good Luck!!!!!!!!
Its gonna take a big dome I have .125 domes and 64cc with .037 quench and Im only 11.3X:1
I found c/r calculator http://www.csgnetwork.com/compcalc.html.
According to this I'll get about 9.8 w/ flat tops and 0 deck.
May I'm screwing up some numbers.
Let's say I can only get 9:1 w/ my 76cc . How much will this effect power vs.
a 10:1?(is it worth worrying about it?)