PAC Racing 1300 Series Dual Valve Spring - 780 lb/in Spring Rate - 1.130 in Coil Bind - 1.500 in OD - Set of 16 PAC-1356 Axle Tether Features:Designed for street/performance use with

Features:Designed for street/performance use with a mechanical and vacuum advanceWill not fit 235 and 261 enginesMust be used with an MSD Ignition ControlSupplied with a socket style distributor cap and rotorO-ring seals can be added to modified blocks to improve oil pressure controlSpecial oil tract improves lubrication to the distributor and cam gearNylon pads ensure smooth operation of the advance weightsAdvance weight pins are staked and tig welded to the plateMechanical advance assembly can be locked out for crank trigger systemsAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionPolished steel shaft is QPQ coated and guided by a sealed ball bearingMaintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangeCNC machined billet aluminum housing and billet aluminum baseVacuum advance canister for improved economy (can be locked out)Easy-to-adjust mechanical advance with supplied springs and stop bushingsCARB E

Utilizing a high-performance 19-Row Stack Plate Cooler with integrated turbulators and airflow supplied by two 5" waterproof/dustproof electric fans

Launch rev limiter

320" Gasket Bore

PAC Racing 1300 Series Dual Valve Spring - 780 lb/in Spring Rate - 1.130 in Coil Bind - 1.500 in OD - Set of 16 PAC-1356 Axle Tether Features:Designed for street/performance use withProduct Description: Valve Spring 1300 Series Dual Spring 780 lb in Spring Rate 1. 130 in Coil Bind 1. 500 in OD Set of 16 PAC Racing Springs is part of the Race Winning Brands Family. With more than 100 years of spring manufacturing experience. We understand the demands of racing and provide a commitment to all of our customers to provide the best service possible. We continue to expand products and offer expanded onsite technical services at various