L92/L76 Head milling ?
Wiesco, Diamond, JE, Ross, they will all make you a custom piston to fit your application and get you in the compression ratio you want. This is not impossible, but the custom piston is more money then one of there "off the shelf" piston they make on a regulare basis.
Angle milling the heads will get you to your target c/r. It's possible to get the chamers down to the mid 50cc range with angle milling. Of course it leaves the deck on the exhaust half of the head a bit thin...................
Going with the dome piston setup, I thought I saw that Wiseco made a +5cc dome piston for this bore and stroke?
Richard
Going with the dome piston setup, I thought I saw that Wiseco made a +5cc dome piston for this bore and stroke?
Richard
TECH Apprentice
Joined: Jan 2008
Posts: 366
Likes: 0
From: Gladstone, Queensland, Australia
My heads initially had 20thou off, then got some more off the machinist tells me 16 more, The chambers measure 60cc. I have flat tops with 4cc reliefs, stock GM gaskets, pistons come 9 thou out the block, around 42 thou quench. I am at a bit of 11:1 comp, I can still take a bit more off the heads and run a 45 thou gasket going to a 40 means around 31 thou quench bit tight for my liking but ok for a steel rod, This will take me to 11.8:1, Which would be ok, with my good quench and current cam it is running 30 deg timing no knock at all. If I was going to run a 240s plus cam I would definately run 12:1 no questions asked on these heads. I would look into a dome top for that extra 5cc run a 40 thou gasket and then mill them to get it.
