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Quote:
Originally Posted by Barry_R
Several of the 390 engines built for trucks used a very short 410/428 pin height - put the piston waaay down the hole and had like 7.5:1 compression. Replacement pistons for those like the F-M 304NP or Silvolite 1139 - can be used to built budget strokers with a 428 crank.
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Looking thru Summit the 304NP has a 1.759 pin height. Same as 390.
The 381NP has the lower pin height needed for the 410/428 conversion which uses a 1.66 pin height.
The Silvolite 1139 list as the 1.66" pin height.
Not saying your wrong, just want to be sure...
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Last edited by convincor; 03-03-2009 at 07:14 PM..
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