Head Milling

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Jun 21, 2011 | 04:57 PM

The Bus

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Pro

Joined: Dec 1999

Posts: 673

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From: Venetia,Pa,USA

Head Milling

How much metal can be taken off a set of 113 heads before it would cause problems with gaskets and block alignment????

Jun 21, 2011 | 06:10 PM

C409

Le Mans Master

Joined: Feb 2005

Posts: 6,475

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From: Clearwater Florida

..... The surface hardening on factory aluminum cylinder heads is at most .020 deep ... my machinist did not want to take off more than .013 for that reason ...

Jun 22, 2011 | 08:09 AM

ddahlgren

Melting Slicks

Joined: Dec 2008

Posts: 2,772

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From: Mystic CT

Quote:

Originally Posted by C409

..... The surface hardening on factory aluminum cylinder heads is at most .020 deep ... my machinist did not want to take off more than .013 for that reason ...

They are not surface hardened they are heat treated all the way through. What happens during use especially if overheated they get softened and then it is very hard to get a good surface finish when milling them. It does not take much to screw up the alignment of the intake gaskets when milling heads. 0.020 is probably a sensible limit.
Dave

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