P4876451 piston?

[Snook]

Opened up my 440 and these pistons have PN# P4876451 stamped into them. Anyone have the lowdown on this piston? Looks like a mopar performance part number.

Chuck

 

[Snook]

for archival data purposes, it's a 0.060" over forged piston, mopar performance part. 4.38" bore for a 440.

Chuck

 

[Cranky]

How do they measure from the deck?

 

[Snook]

I have to say, these are some funky slugs. Down in the hole deck clearance varies across the centerline of the wristpin boss from -0.002 to +0.002 - this is for all 8 slugs. I'm using them right now but they'll be paperweights when I get the new shortblock done this spring.

Chuck (snook)