Order Status & Returns
Gift Cards
Help Center
1-800-345-4545
Vehicle Info NeededCANTON RACING PRODUCTSPART NUMBER: 074-21-850
21-850 Rear Main Seal Adapter 1986-Up SB-Chevy
$22500
Ships on Sep 03, 2026
Lowest Price Guarantee
Main Seal Adapters
- Rear Main Seal Adapter
- 1986-Up SB-Chevy
- Converts 1-pc to 2-pc seal
- Billet aluminum
This SBC rear main seal adapter converts '86 and newer blocks with one piece rear main seals to accept an older style two piece seal crank shaft. The adapter is essential when installing an early style (pre-'86) crankshaft into '86 & newer blocks. When using this adapter an oil pan for a pre-86 block with a right side dipstick must be used. Made from Billet aluminum, hardware included.
Part TypeCrankshaft Seal Adapter
BrandCANTON RACING PRODUCTS
Package Height1.0
Package Width6.6
Package Length7.5
Weight1.23 PG
Part CategoryPerformance Parts
PositionRear
Part FitmentSemi Universal
Vendor Part Number21-850
Package Qty1
Package TypeEA
No Questions
No Reviews
ITEM YOU MAY ALSO CONSIDER
JEGS
Rear Main Seal Adapter Fits 1986-2002 Small Block Chevy Engine when Using a 1955-1985 Early Style Crankshaft and Oil Pan
Part Number : 555-502500
$14999$164.99
You Save$15.00
MOROSO
Small Block Chevy Rear Seal Adapter Use with Old Style Oil Pan (Pre-1980 Blocks with Driver Side Dipstick)
Part Number : 710-38415
$27999
JEGS
Part Number : 555-502500
$14999$164.99
You Save$15.00
MOROSO
Part Number : 710-38415
$27999
Some parts are not legal for use in California or other states with similar laws / regulations
