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Old 03-05-2016, 07:38 PM   #4
TomStark
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Join Date: Jul 2015
Location: Metro Detroit
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Default Re: 1970 to 1990's Marathon explained

Quote:
Originally Posted by Doody View Post
I have a 86 marathon that I'm rebuilding the top end it has the 2pg engine and I'm trying to figure out if it's better to use the two port 3pg piston instead if some one can shine some light on this that would be grate
I do not know, but would bet it is best to use the 2pg piston in the 2pg and 3pg piston in the 3pg. No idea if there is any gain to be made by using the 3 in the 2, but willing to bet it is miniscule at best. I think there is a lot more to gain by making sure the port timing is correct for your use, and that the ports are aimed correctly, maybe give a little more compression, etc.
Tom
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