[DeTomaso] Another question about the original motor.

JDeRyke at aol.com JDeRyke at aol.com
Fri Sep 3 03:50:13 EDT 2010


Theory and guesses aside, one way to tell for sure is to drop the oil pan 
and shine a strong light up the cylinder bores to show the underside of the 
pistons. Forged pistons NEVER have undercuts around and above the wristpin 
bosses while cast or cast-hypereutectics always do. Sometimes, the piston p/n 
is marked underneath. 
Or, pull a head (ideally, two; some mechanics only fix what's broken and 
send the engine down the road. I've seen motors with ONE .030-over piston and 
7 more at std size) and clean off the crowns. There may be a mark or 
something on the top to tell you the part number. Typically, forged piston p/n's 
will be followed by 'F'. Good luck- J Deryke



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