This is a USED set of GM BBC pistons. These have a. 990 pin dia.
Pistons BBC 4.338" 1.15 ch Diamond 6241A100 NHRA IHRA Truck IMCA WISSOTA MUD K&N
Pistons BBC 4.500" 1.65 ch SRP PN 139482 NHRA IHRA Truck IMCA WISSOTA MUD K&N #1
Pistons BBC 4.500" 1.65 ch SRP PN 139482 NHRA IHRA Truck IMCA WISSOTA MUD K&N #2
Pistons BBC 4.290" 1.350 CH Speed Pro H1134CP +040 NHRA IHRA Truck IMCA WISSOTA
Pistons BBC 4.280" 1.645 ch WISECO PTS514A3 NHRA IHRA Truck IMCA WISSOTA K&N MUD
Pistons BBC 4.442" 1.55 ch CP 4516 NHRA IHRA Truck IMCA WISSOTA MUD K&N
