1966 1967 1968 1969 1970 1971 1972 1973 1974 ALL FLEXPLATE

Part Number: 471529

ALL  FLEXPLATE - Part Number 471529
Flexplate Year of Engine 1969-85. Outside Diameter: 12.75 in Crank Flange Bolt Pattern: 3.58 in Clutch Diameter: 9.75 in; 10.75 in Converter Bolt Pattern: 153 Technical Notes: For internally balanced engine with two-piece crank seal. GM engineers redesigned the crankshafts used in production small-block V8 and V6/90 deg engines in 1986 to use a leak-resistant one-piece rear seal. This change from a two-piece seal to a one-piece seal required a change in the bolt pattern on the crankshaft flywheel flange. The bolt circle on pre-1986 production crankshafts is 3.58 in. in diameter. 1986 and later cranks have a 3.00 in bolt circle. In addition, all cranks which use a one-piece seal require a counterweighted flywheel for proper engine balance. Many of the flywheels in Group 0.666 are designed for heavy-duty and pre-1986 production crankshafts with a 3.58 in diameter flywheel bolt pattern. This larger bolt pattern is recommended for competition engines. If your engine has a crankshaft with a one-piece rear seal, you must us a flywheel (or flexplate) with a 3.00 in bolt pattern. Flywheels and flexplates for these cranks are available in 12-3/4 and 14 in diameters. The manual transmission flywheels and automatic transmission flexplates can be used with Chevrolet small-block V8 and 90 deg V6 engines. When selecting a flywheel or flexplate, be sure to match the outside diameter, flywheel flange bolt pattern, and clutch/converter diameter to your application. GM Performance Parts offers lighweight nodular iron flywheels for pre-1985 and 1986-up engines. These lightweight flywheels reduce an engine's rotating inertia and improve throttle response. They were originally installed on many high-performance Chevrolets. All 400ci-small block Chevrolet V8s are externally balanced, and must use a counterweighted flywheel (or flexplate) for proper engine balance.
Year of Engine 1969-85 1966 1967 1968 1969 1970 1971 1972 1973 1974

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