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Milling heads

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Old 07-12-2017, 09:13 AM
COsby
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Milling heads

Hey all, with the potential of some internal engine work, it got me thinking about increasing some performance while I'm at it.
Has anyone milled their 2v PI head to raise the compression slightly? I haven't done the research to know the current compression.
I know it will have to be tuned but that is not a problem.

Just wondering if anyone has been down this path yet.
 
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Old 07-13-2017, 07:39 AM
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I don't think you'll get enough of a bump to even worry about a tune for it. If you're that deep into the engine, you might consider non-PI pistons that'll raise the compression a lot more.
 
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Old 12-24-2017, 04:46 PM
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Ford motor company states emphatically that they don't approve resurfacing heads on the v-10.
 
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Old 01-02-2018, 08:05 AM
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I've learned recently it's an interference so if they are milled, they will contact the pistons.
 
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Old 01-03-2018, 05:55 PM
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Originally Posted by COsby View Post
I've learned recently it's an interference so if they are milled, they will contact the pistons.
Any head that is milled too much will have clearance issues. Interference has nothing to do with it. I have had 7500 rpm 4 valve interference heads milled, and they work just fine.

Milling for compression is a mistake though. On overhead cam motors milling causes timing issues unless thicker head gaskets are used, which defeats milling for compression.

Milling to fix issues can be done as long as the head still meets certain tolerances. One of which is adding a thicker head gasket to make up for loss of head thickness. Something I bet most remanufactured motors don't have.
 
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