Duncan_GT

What's the max limit on cylinder head milling? I have 65cc combustion chambers

mjr46

Mine were taken iirc from 64 to 62, ask ED what he thinks, he's got more experience doing such.

Duncan_GT

Does Flowtech do that? At first thats how I was going to do mine, go from 65 to 62. If I can get them to 58 that would bump compression to 10.5

I just don't want to run into fitment issues.

mjr46

milling it that much may cause you to have to mill the intake as well....but I could be wrong, I'm sure ED could send it out to one of his shops but it's better/quicker to have it done locally, I had a local machine shop mill my intake....but that is a story in itself which got ED to call me personally..lol

mjr46

do you have dished pistons???

Duncan_GT

Yeah I do, which was my first mistake. I wish I would have gotten flat tops

mjr46

It would be easier to switch the pistons than mill all that off the heads, meaning , once the metal is gone , it's gone, rendering future millings for probs that could occur difficult

Duncan_GT

I would do that, but everything is getting balanced. I don't want to have to pay for that job twice.

Diputado

Not sure for what engine you're planning on milling the heads, but for what it's worth, I once had a 289 running 1969 model 351W heads that were flat-cut 40 thousands and angle-milled 62 thousands. I ran a Holley Street Dominator single-plane intake and didn't mill anything off the intake. Bolted it right on and it worked fine. Drove it on a daily basis for nearly 3 years. Was running a .500 lift/300 duration cam and TRW 12.5:1 pistons, too. But.....that was back in 1980 when you could still get 98 octane gas! I don't think I'd use that combination today, which is unfortunate, because that was one mean-*** engine! Bottomline...determine what comp. ratio you want (or can get away with!) and calculate milling based on that. My 2 cents...!

Duncan_GT

Thats what i did. I want 10:1, but if i can get it to 10.5 without issues then I'd want to do that