NPR American V8 Engine Ring Series Piston Ring Set - 4.130 in Bore - 1.2 x 1.2 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder Hose Support Spring Features:Designed for street/performance use with Size:6-7/8 (55) Stainless steel T bolt ATM7012 12-600-4

NPR American V8 Engine Ring Series Piston Ring Set 4.130 in Bore 1.2 x 1.2 x 3.0 mm Thick Standard Tension Nitride 8 Cylinder Hose Support Spring Features:Designed for street performance use with Size:6 7 8 (55) Stainless steel T bolt ATM7012 12 600 4 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 ***Supports up to 550 EFI or 700 Carb HP (HP Rating @ 60 PSI at 13