I am home porting the heads right now and taking them to the machine shop tomorrow. I was thinking of having them milled .010. I am using the felpro .039 head gaskets. The cam is the xe 230/236 .544/.555 with 1.6 rr, and 1.56/2.00 valves. Will I run into any problems? Does anybody have an idea of what the CR will be? I polished the chambers, but didn't take out a whole lot of material. Thanks.

 

Im wondering the same thing. I have a set of heads that have been hogged out. Expecting some really great flow numbers. They are bare now, but my set-up will be the exact same as yours. I was thinking .010 would be the way to go, but I would like to get some opinions like your self on this.

What compression ratio you looking for? Using that Felpro gasket with stock heads you would be looking at a 10.8:1 ratio.

Does anyone know what would be the ideal ratio to have?

Not trying to intrude on your post, just thought I would add to it since I have the same question I was getting ready to post

 

.010 will not be a problem... thats just a clean-up cut.

My Brodix catalog says ".006 per cc" which means you'll be reducing the volume by 1.7 ccs. That's not going to do anything drastic to your static compression but it will give you a new number to plug into one of these online spreadsheets. You would ultimately need to cc the chamber to know exactly what you're dealing with.

-Mindgame

 

Alright I can understand that .010 is a "clean-up". So what would a person suggest if they wanted a little more HP out of their set-up and they were taking their heads to the shop to be milled? Would a person just do a .010 milling or go more? And if more what would they go to?

 

Depends on the deck thickness of the head in question. I don't know the flat milling limit for a stock LT1 head but I'd imagine that at some point, angle milling would be required to lower the combustion space.
There isn't much to be gaines there though. You can get right at 12.0:1 with a 4.0" bore, 52 cc combustion chambers a 5 cc piston, zero deck height and an ~8 cc gasket. That's about as much as you really need on the street and the actual gains 11.5-12.0 aren't that significant.

-Mindgame