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250 in Valve Stem
Straight Bolt
1965-1991 Pontiac Bonneville
Two-piece billet aluminum mount fits dial-in boards with 8
Speed-Pro Standard Gap Plasma Moly Piston Ring Set - 4.125" Bore (+.040") - Top Ring: 1/16", 2nd Ring: 1/16", Oil Ring: 3/16", Oil Tension Ring: Standard 4000501 250 in Valve StemSpeed Pro designs and engineers pistons to meet the most demanding street performance and racing conditions. In combination, we draw upon more than 100 years of Speed Pro engine mastery to enhance the piston ring and its seal. Our Speed Pro(R) brand is recognized for being a winner in every form of racing, and is the proven horsepower leader in oval track and drag racing. Hell Fire(R) Rings: Speed Pro Hell Fire rings, manufactured from a specially
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