My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Cometic C5086 Chevrolet Mark-IV Big Block V8 2-Piece Silicone Rear Main Seal

(Chevrolet Camaro 1967-72, Corvette 1965-74, Impala 1965-76, Malibu 1965-67, 1973-75, C1500 1990, Chevelle 1965-73, Blazer 1973-74 + 96 more models)

Part of: Cometic Rear Main Seal for Chevrolet Small Block

Other options in this family: Cometic C5681 Cometic C5683 Cometic C5682 Cometic C5689 Cometic C5385

Manufacturer

Picture for manufacturer Cometic

Part Number

C5086
12 reviews
Sale Price

$17.53

1 left at this price

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Cometic C5086 is a 2-piece silicone rear main crankshaft seal designed specifically for the Chevrolet Mark-IV Big Block V8 engine family. Engineered to stop oil leaks at the rear of the crankshaft, this seal delivers a reliable, long-lasting barrier between the engine block and oil pan.

Key Features:

  • 2-piece split design for straightforward installation without removing the crankshaft
  • Silicone construction provides superior flexibility, temperature resistance, and long-term sealing performance
  • Manufactured to meet or exceed OEM quality standards
  • Suited for a wide range of environments and operating conditions
  • Compatible with Chevrolet Mark-IV Big Block V8 engines (1965–1990)
  • UPC: 191070121570

Cometic rear main seals are crafted from premium materials selected for durability and sealing integrity. The silicone compound maintains its seal under the heat and pressure cycles common in Big Block applications, making the C5086 a reliable choice for street, performance, and restoration builds.

Products specifications

Fits

Chevrolet Camaro 1967-72, Corvette 1965-74, Impala 1965-76, Malibu 1965-67, 1973-75, C1500 1990, Chevelle 1965-73, Blazer 1973-74, C10 Pickup 1968-74, Caprice 1966-76, C10 1975-80, El Camino 1966-75, Monte Carlo 1970-75, Nova 1969-72 + 90 more models

Prop 65

WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

Easy

Best price to be found, no ridiculous shipping costs.

Item was easy to find

Great Prices!! Hopefully will ship quickly

slight hiccup with payment, but paypal triumphed over Amazon!

Fast and easy!

Easy and quick

92-96 Honda prelude

You had what I was looking for at a Great price.

I am very glad that my order came in on time and in great condition!

Great price on a hard to find item! Ordered on a Sunday and it shipped the next day via FedEx...so great service!

Wow super fast shipping and I ordered over a holiday weekend. Will be doing business with this site again soon.

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy