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rotorwrench · 04-01-2021, 08:31 PM

Pickups didn't come with the 255 even if its a Mercury pickup. I have one 1CM head on one of my 51 Mercury cars but the other one has 8CM heads on both sides. The stroke length & piston pin location is the only difference between a basic Ford 239 and a basic Mercury 255. The Mercury 1CM head may compare to an 8RT truck engine head as far as compression ratio is concerned.

04-01-2021, 08:31 PM	#4
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: 1cm Pickups didn't come with the 255 even if its a Mercury pickup. I have one 1CM head on one of my 51 Mercury cars but the other one has 8CM heads on both sides. The stroke length & piston pin location is the only difference between a basic Ford 239 and a basic Mercury 255. The Mercury 1CM head may compare to an 8RT truck engine head as far as compression ratio is concerned.