04-01-2021, 08:31 PM
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#5 |
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Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 17,411
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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.
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