What is Viton and why is it used for this seal?

Viton is a high-end fluoroelastomer rubber known for its superior heat and chemical resistance. It's used for this rear main seal because it can withstand the demanding conditions and high temperatures found in Chevrolet Mark IV Big Block V8 engines, offering improved durability and longevity.

Is this a one-piece or two-piece rear main seal?

This Cometic rear main seal is a two-piece design. This configuration can often make installation easier on certain engine blocks compared to a one-piece seal, as it doesn't require the crankshaft to be fully removed in all cases.

What vehicles does this rear main seal fit?

This seal is designed for Chevrolet Mark IV Big Block V8 engines and fits a wide variety of vehicles from 1965 through 1990. Examples include Chevrolet Impala, C10 Pickup, Camaro, Corvette, and many other models from that era.

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Specifications

Brand: Cometic Gasket
Part #: C5682
UPC: 191070008185

Cometic Chevrolet Mark-IV Big Block V8 Rear Main Seal - 2 Piece

Name: Cometic Chevrolet Mark-IV Big Block V8 Rear Main Seal - 2 Piece
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevrolet-mark-iv-big-block-v8-rear-main-seal-2-piece-t14-808725
Price: 40.54 USD
Availability: BackOrder

$40.54

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Cometic Chevrolet Mark-IV Big Block V8 Rear Main Seal - 2 Piece. Made from durable Viton for excellent resistance.

Key Features

Fits a wide range of Chevrolet Mark IV Big Block V8 engines.
Constructed from durable Viton fluoroelastomer rubber.
Offers excellent heat and chemical resistance.
Two-piece design for easier installation on many applications.
Helps prevent oil leaks from the crankshaft rear main seal area.

No-fit, no charge. Wrong part? Send it back, free return label.

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About this part

Product Details

This two-piece rear main seal from Cometic Gasket is constructed from Viton, a high-end fluoroelastomer rubber known for its exceptional heat resistance, chemical resistance, and overall durability. It's designed specifically for Chevrolet Mark IV Big Block V8 engines, helping to keep oil contained within the crankcase and preventing leaks. This seal is a solid option for rebuilding or repairing the bottom end of your engine, ensuring a clean and efficient operation.

The Viton material offers a significant advantage over standard rubber seals, especially in high-heat environments common to big block V8s. Its robust nature means it can withstand the demanding conditions found in the crankcase, contributing to a longer service life and more reliable sealing. This seal fits a wide range of Chevrolet vehicles from the mid-60s through the early 80s, including popular models like the Chevrolet Impala, C10 Pickup, and Camaro, making it a versatile choice for many classic builds.