Differences in 400's
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Differences in 400's
Freind has a 400 out of a early 70's lincoln MarK V Wondering was there a difference between the designs for cars and trucks?
I have heard the compression was different depending on year. What made the difference and was anything else different.
I have heard the compression was different depending on year. What made the difference and was anything else different.
Posting Legend
Joined: Sep 2001
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Tuned
Joined: Jul 2003
Posts: 455
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From: Berkeley
the difference between '71 and later compression was due to flat-top pistons vs dished. the variations in other years and between car/truck motors was due to differing combustion chamber volumes (heads), afaik. factory piston compression height was unchanged, but aftermarket replacement ch is typically lower to compensate for head/deck resurfacing. So, CC your heads and measure deck height before ordering pistons. Tim Meyer carries zero-deck (or close to it) pistons for 400's, but be careful not to go too high on SCR for your cam...
