Mill heads how much for my application?
08-15-2008, 03:30 PM
#1
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Mill heads how much for my application? i need to know as soon as possible, how much should i mill just to get better compression, cam that im running is gm asa cam, heads are 853 cnc lingenfelter heads, i dont want to mill alot cause i dont want to have any ptv issues, i just want to raise compression just a bit to get better power out of them, and also the deck does need a small resurfacing on the heads, plz let meknow on whatu guys thing, im using gm mls gaskets pushrods imusing are 7.4 trickflows
08-15-2008, 03:54 PM
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Shoot this to Patrick G and he should be able to help you with this But, when you get into cutting the deck height everything changes. If your in this deep you may find an expert locally to help with the whole combination.
Mike V
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08-15-2008, 04:58 PM
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What you need to actually know is what CC the chambers are now then go from there, without knowing where the heads are now nobody can tell you how much to shave off, hell its possible they are already milled and you cant take any more off without issue.
Also without all the engine specs nobody can answer that question ( and actually give you an intelligent reply anyway ).
Get the CC volume first and go from there, that will tell you roughly how much they are milled now and if you can go further.
I myself would stop milling around the 60 or so CC. 64CC gives you rougly 10.5
60CC will put you in the 11.5ish area.
But more than anything the cam and bottom end specs are a huge factor in anwering your question.
Piston to valve clearence.... Who knows we dont know what pistons you have, cam or anything ( i know you said you have a gm asa but that means jack to me, that dosen't give me the lift and duration )
Go try to use a Dynamic Compression calculator and you will see what I am talking about.
Also without all the engine specs nobody can answer that question ( and actually give you an intelligent reply anyway ).
Get the CC volume first and go from there, that will tell you roughly how much they are milled now and if you can go further.
I myself would stop milling around the 60 or so CC. 64CC gives you rougly 10.5
60CC will put you in the 11.5ish area.
But more than anything the cam and bottom end specs are a huge factor in anwering your question.
Piston to valve clearence.... Who knows we dont know what pistons you have, cam or anything ( i know you said you have a gm asa but that means jack to me, that dosen't give me the lift and duration )
Go try to use a Dynamic Compression calculator and you will see what I am talking about.
08-15-2008, 04:59 PM
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This was a few years ago when I talked to Gunnar. When he asked me how much I wanted milled, I told him I didn't want any piston to valve issues and just wanted to play it safe. I'm pretty sure he said I'll just take a "cleaning pass" on them.