Exactly, because the Boss 429 IS a Hemi.Boss 429 piston looks similar to a 426 Hemi piston...
Excellent question. Clearly a high compression rat piston, odd that the number appears nowhere! A TRW piston that appears in none of the five various catalogs mentioned in this thread?In the era of people being able to find information with the touch of a key or screen where the hell is this piston number ??
Right, if we could get the nominal size and pin height it would be very easy to figure out.Excellent question. Clearly a high compression rat piston, odd that the number appears nowhere! A TRW piston that appears in none of the five various catalogs mentioned in this thread?
The engine you posted is a 429 SCJ.... The 429 Shotgun is the Boss 429.. Not the "Cobra Jet", not the "Super Cobra Jet"... The Boss 429.... And The Boss 429 is a true Hemi...Nope.
The Shotgun engine was classed as a semi-hemi. Valves were in a different plane to the Hemi, see the pic.
View attachment 1716141891
The OP isn't helping his own cause, by not giving us dimensions. We know it is a big compression bbc open chamber piston, but for what engine? 396, 427, or 454. Diameter and compression height would tell us.The link I posted quotes a '78 catalog listing for an L2308AF, described as a 427 Chevy 12.2:1 slug for a 427 Chevy open-chamber 2nd design. Meaning the 1st design would have to be in an older-than '78 catalog...
This pissing match, however Ford-informative it may be, isn't helping the OP....at all.
True, We have asked the OP for these basic, critical dimensions and crickets so far.....The OP isn't helping his own cause, by not giving us dimensions. We know it is a big compression bbc open chamber piston, but for what engine? 396, 427, or 454. Diameter and compression height would tell us.