JE Pistons Tour Series GP (Gas Ported) Flat Top Forged Piston Set - SB Chevy 359 C.I. - Bore" 4.040" - Stroke: 3.500" - Rod Length: 6.000" Bilstein Shocks Spacers can only be used

Spacers can only be used with wheels that have cut-outs (facing the hub) to clear the stock Studs

1965-1991 Buick Riviera

center indexing hole to work with most metric style axle flanges with a maximum O

Drive Flange

Offered in male NPT and male AN thread sizes - in straight and 90 configurations

JE Pistons Tour Series GP (Gas Ported) Flat Top Forged Piston Set - SB Chevy 359 C.I. - Bore" 4.040" - Stroke: 3.500" - Rod Length: 6.000" Bilstein Shocks Spacers can only be usedSimilar to the Ultra Light GP, this piston has undergone engineering changes to handle higher horsepower 4 barrel applications (approximately 650 hp) and angle milled heads. Both 350 and 400 series accept oversize valves (intake pocket is 2. 255" and the exhaust pocket is 1. 870") and long duration, tight lobe separation cams. The ring grooves are precision machined for . 043, . 043, 3mm back cut rings with lateral gas ports for superior ring seal.