The ACL 5M909H-20 is a 0.020 in undersize main bearing set from ACL's H-Series line, built for Small Block Chevy engines. This designation means the bearing is machined thicker than standard to fit a crankshaft journal that has already been reground 0.020 inch below stock - a step taken when reconditioning a worn crank.
Specifications:
- Type: Main Bearing Set
- Series: H-Series
- Size: 0.020 in Undersize
- Engine Fitment: Small Block Chevy
- Part Number: 5M909H-20
FAQ
What engine is the ACL 5M909H-20 main bearing set designed for?
This main bearing set is designed for Small Block Chevy engines.
What does "0.020 in Undersize" mean for this bearing set?
It means the bearing is machined thicker than standard to fit a crankshaft journal that has been reground 0.020 inch below stock diameter.
What is ACL's H-Series?
H-Series is the ACL product line this main bearing set belongs to.
What is the part number for this main bearing set?
The part number is 5M909H-20.

