Manley Severe Duty Exhaust Valve - 1.600 in Head - 0.342 in Valve Stem - 5.165 in Long - Small Block Chevy / Ford - Set of 8 4122SMLRD Dart block parts kits include

Dart block parts kits include the same quality components we use in our performance engine blocks

Most columns include new floor mounts

sealed connection instead of notching the pump wire for competition modules

Joes Wing Slider Actuators

Features:Designed for use in marine applications with Chevy V8 automotive enginesWill not accept a vacuum advance canisterSupplied with a bolt down HEI style distributor cap and rotorWeathertight connectors are used for locked and sealed connectionsMust be used with an MSD Ignition ControlO-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 bearing and extra long sintered bushingMaintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangeEasy-to-adjust mechanical advance with supplied springs and stop bushingsCNC machined billet aluminum housing and billet aluminum base with two flame arrestor holes with brass screensUL Approved

Manley Severe Duty Exhaust Valve - 1.600 in Head - 0.342 in Valve Stem - 5.165 in Long - Small Block Chevy / Ford - Set of 8 4122SMLRD Dart block parts kits includeSEVERE DUTY SERIES Superior Stainless for High Temperature Gasoline Engines Exhaust Material XH 428 with Double the Ultimate Tensile Strength ( at 1500 F ) over the competition Intake Material NK 844 with 1000 Times Better Fatigue Strength than competitors offerings Manley Performance high performance and racing engine parts have been powering winners since 1966. Since our inception in March 1966, Manley Performance Products has been at the forefront