Speed Pro Speed Pro Piston Forged 4.000" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.1 cc Hastings PerTronix D104600 Flame-Thrower Electronic Distributor

PerTronix D104600 Flame-Thrower Electronic Distributor Cast Chevrolet Small Block/Big Block with Ignitor III Technology Vacuum Advance Black Cap

(The suspension is not at full droop or unnecessarily compressed

1" or 1-1/2" raised steel mounts are 1/4" thick and slotted for easy installation

not limited to the SAE sized wire used in the production of many of the springs currently on the market

Allows Jet Changes

Speed Pro Speed Pro Piston Forged 4.000" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 6.1 cc Hastings PerTronix D104600 Flame-Thrower Electronic DistributorFully 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.