Speed Pro Speed Pro Piston Forged 4.124" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Plus 21.0 cc MAC-X-HOSE-12 Gauge also features a rubber

Gauge also features a rubber boot for protection

Water Injection Mixture

28 oz External Balance

and it features a band clamp mount for easier timing adjustments

Installation Tip: If you plan to install an MSD Ignition with your GM Dual Connector Coil

Speed Pro Speed Pro Piston Forged 4.124" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Plus 21.0 cc MAC-X-HOSE-12 Gauge also features a rubberFully updated skirt profiles Exclusive DUROSHIELD skirt coating. DUROSHIELD provides scuff resistance, reduced bore clearances and enhanced ring sealing. SPEED PRO POWERFORGED pistons are built to stringent specifications with a precision CNC machined dome and skirts and microfinished ring grooves. The manufacturing process ensures that piston weights within a boxed set will not vary more than 4 grams and that skirt sizes are matched to within 0.