how many cc's can i take my heads to? i want to lower the compression. thanks.

 

Well I would only port the combustion chamber if you really know what you are doing. Have someone who is familiar with the SBC combustion chamber show you what to do. On a stock LT1 head I would say the most beneficial area to remove material in would be around the exhaust valve to unshroud it. You will want to work slow, and CC the chambers as you go along because 1 cc volume isn't alot when the aluminum starts flying. Make sure you use Dykem (aka Prussian Blue) and a scribe so you don't go to far.

 

thanks for the info, but would you knwo how many cc's i can go total? like 62? 68?


thanks

 

I have a set laying around the shop and just by looking at them I would say at least 62 or 64 cc. SRP makes some decent pistons that will put compression in the mid to high 8's with 64 cc chambers

 

problem is i already got these trw pistons i was gonna use for my heads and cam project but someone offered me two swap my heads for his blower. so i went for it and im trying to hog out the ccs on the stock heads to drop the compresion. im looking to get it into the 9.7:1 to 10:1 range. do you think 72cc is withing reach? or is that too much?

thanks again

 

LT1 heads come pretty cheap. Get a head, and cut it up. Then people won't be inclined to give you guesses for answers.

 

thanks but id thought someone has doens this already! may have to resort to trail and error.

 

Just don't encourage me!

 

come on arnie! you know you wanna find out!

 

The guy I had port mine opened up the combustion chambers to 74cc, I had to take some off for surfacing, They ended up at 70cc's

 

woah thanks for letting me know!