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 4.125" 1.208" CH ARCA NHRA IHRA Truck MUD UMP IMCA WISSOTA K&N
JE Pistons Head Gasket GM1004-039; MLS .039 in. 4.200 in. Bore for 400 SBC
JE Pistons Head Gasket GM1003-030; MLS Series .030 4.165 Bore for 400 SBC
Pistons SBC 4.125" JE 622R&L NASCAR ARCA NHRA IHRA Truck MUD UMP IMCA WISSOTA KN
Pistons SBC 4.125" JE 281793 NASCAR ARCA NHRA IHRA Truck MUD UMP IMCA WISSOTA KN
