Milling heads
#1
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Milling heads
I may be getting a set of L36 heads, and I'd like to know how much they can be milled before piston/valve contact is an issue. Can it be done or do I need to pick up some pistons that are either dished or have valve reliefs?
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For safety I don't think that I would go past .010 with stock pistons. Probably should have a machine shop look into that one for you.
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You want to make them flat or up your compression? You could use thinner head gaskets if your heads are already true, save a few bucks? 10 thou is not unheard of btw.
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Originally Posted by PontiacDad
10 thou is not unheard of btw.
I'd imagine that he'* milling the heads to up the compression. But chances are the engine that he'* getting the heads off of has been overheated pretty good....so he may need some milling just to flatten them out.
#5
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You're right on both counts, Nate. The heads may be warped, but even if they're not I'd like to get 'em milled for more compression. Is this a question better suited for Todd or Scott?
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I'd figure that Todd would know for sure. I'd say 20 thou before you need different pistons.
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Check this out:
http://www.zzperformance.com/latest_news1.php?id=48
I'm guessing you can probably mill the heads 40 over with stock thickness head gaskets but i know you can mill 30 over with .052" headgaskets.(someone on clubgp is running it now) You will need 7.0" pushrods to keep correct valvetrain geometry.
http://www.zzperformance.com/latest_news1.php?id=48
I'm guessing you can probably mill the heads 40 over with stock thickness head gaskets but i know you can mill 30 over with .052" headgaskets.(someone on clubgp is running it now) You will need 7.0" pushrods to keep correct valvetrain geometry.
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Originally Posted by opensourceguy
Just be careful if you start messing with rockers and cams. You could run into the valve smacking the piston then
-justin
-justin