ProTru by Wiseco 23 Degree Dome Piston Forged 4.040" Bore 1/16 x 1/16 x 3/16" Ring Grooves - Plus 8.0 cc 01-1630 Since this distributor has its

Since this distributor has its own ignition module there is no need to run an MSD Ignition Control

T-nuts have slot built in to keep them from turning

Maximum Pressure Rating of 250 PSI

If you look at the photo

ProTru by Wiseco 23 Degree Dome Piston Forged 4.040" Bore 1/16 x 1/16 x 3/16" Ring Grooves - Plus 8.0 cc 01-1630 Since this distributor has itsChevrolet Small BlockWiseco Pro Tru is a division of Wiseco specializing pistons and piston rings for price conscious engine builders. They offer complete kits to fit a wide range of engines. Manufactured by Wiseco Performance Products, ProTru Forged Pistons are affordable with features usually found only in more expensive pistons. Product Description: Piston and Ring 23 Degree Dome Forged 4. 040 in Bore 1 16 x 1 16 x 3 16 in Ring Grooves Plus 8. 00