This ACL H-Series rod bearing set is 0.020 in undersize, machined for a Small Block Chevy or GM LS-Series connecting rod journal that has been reground 0.020 in smaller than stock. It is not intended for a stock, unmachined journal.
Specifications:
- Type: Connecting Rod Bearing Set
- Series: H-Series
- Size: 0.020 in Undersize
- Engine Fitment: Small Block Chevy / GM LS-Series
- Part Number: 8B663H-20
FAQ
What does "0.020 in Undersize" mean for this bearing set?
It means this set is machined for a connecting rod journal that has been reground 0.020 in smaller than the stock diameter. It should only be used with a rod journal that has actually been reground to that undersize.
What engines does this rod bearing set fit?
It is designed for Small Block Chevy and GM LS-Series engines.
What series is this bearing set part of?
This is an ACL H-Series rod bearing set.

