The Ford Barn

34fordy · 08-02-2019, 05:53 PM

Is it safe to mill the 33-36 Ford aluminum heads, 40-6049A + 40-6050A and if so, how many thousands is allowable? Thank you.

Ol' Ron · 08-02-2019, 10:27 PM

Why?? if it's for pitting from corrosion, just make sure the fire ring is clear and fill the corroded area with JB weld or Divcon alum after bead blasting. Done that many times. If it's to increase compression??

Brian · 08-03-2019, 01:45 AM

Flat top pistons....you can safely plane heads without changing piston to head clearance....however, you still need to maintain at least .060" clearance over the valves. No-one can tell you how much you can safely take off; you need to check your existing clearances and calculate how much you can remove. Use clay or similar to check current clearances. Remember to rotate engine through at least two full revolutions whilst performing this test.

deuce_roadster · 08-03-2019, 11:39 AM

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2x what Brian said on checking existing clearances.

08-02-2019, 05:53 PM	#1
34fordy Senior Member Join Date: Dec 2014 Location: Fort dodge, Iowa Posts: 821	Head milling Is it safe to mill the 33-36 Ford aluminum heads, 40-6049A + 40-6050A and if so, how many thousands is allowable? Thank you.

08-02-2019, 10:27 PM	#2
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,857	Re: Head milling Why?? if it's for pitting from corrosion, just make sure the fire ring is clear and fill the corroded area with JB weld or Divcon alum after bead blasting. Done that many times. If it's to increase compression??

08-03-2019, 01:45 AM	#3
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,829	Re: Head milling Flat top pistons....you can safely plane heads without changing piston to head clearance....however, you still need to maintain at least .060" clearance over the valves. No-one can tell you how much you can safely take off; you need to check your existing clearances and calculate how much you can remove. Use clay or similar to check current clearances. Remember to rotate engine through at least two full revolutions whilst performing this test. __________________ Unfortunately, two half wits don't make a whole wit!

08-03-2019, 11:39 AM	#4
deuce_roadster Senior Member Join Date: Oct 2011 Location: Shelton, WA Posts: 3,799	Re: Head milling Sponsored Links (Register now to hide all advertisements) 2x what Brian said on checking existing clearances.