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tubman · 09-13-2019, 12:44 PM

Just make sure that you have the clearances over the piston in the .040"-.050" range for proper quench no matter what kind of heads you use. This involves checking with foil balls, possible milling and maybe a little grinding to get everything just right. It's probably the single most productive modification you can make to these engines.

09-13-2019, 12:44 PM	#8
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,319	Re: 39 or 40 truck motor Just make sure that you have the clearances over the piston in the .040"-.050" range for proper quench no matter what kind of heads you use. This involves checking with foil balls, possible milling and maybe a little grinding to get everything just right. It's probably the single most productive modification you can make to these engines.