These are a. 927 pin. They have a compression height of 1.250".
Pistons JE SBC 4.125" #617F 1.125 CH NHRA IHRA Truck MUD UMP IMCA WISSOTA K&N
Pistons JE SBC 4.160" 1.25" CH NOT A SET BLOWER NHRA Truck MUD IMCA WISSOTA K&N
Pistons SBC 4.125" JE 281793 NASCAR ARCA NHRA IHRA Truck MUD UMP IMCA WISSOTA KN
JE Pistons Head Gasket GM1003-030; MLS Series .030 4.165 Bore for 400 SBC
JE Pistons Head Gasket GM1004-039; MLS .039 in. 4.200 in. Bore for 400 SBC
Pistons SBC 4.126" JE 456631 NASCAR ARCA NHRA IHRA Truck MUD UMP IMCA WISSOTA KN
