Another head milling question...

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Feb 25, 2010 | 11:04 PM

LS6 Silverado

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Another head milling question...

Does anyone know exactly how much you can safley mill a GM LS casting cylinder head before intake fitment becomes an issue? How about before deck thickness becomes substantially weakend? Alot of conflicting info from my searches... I have personally taken .030" off an 862 casting 5.3 head with no issues, even sprayed a 150 shot through it on numerous occasions without any issues. Hoping some cylinder head guru's can chime in a bit. Trying to get the chambers down a bit on some 317's and was curious if anybody knew the safe limits to do so. Thanks-

Feb 25, 2010 | 11:20 PM

NinetynineSS

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I thought it was 0.020", curious to see where this thread goes.

Feb 26, 2010 | 12:02 PM

batboy

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I was recently told by a machine shop that they could take .030" off casting 243 heads, but beyond that there might be issues. Don't know if that also applies to 317 heads or not.