The ACL 5M590A-STD is a Standard-size main bearing set from ACL's A-Series line, built for Small Block Ford engines. Standard size is machined to fit a stock, unmachined crankshaft main journal, making this the correct baseline set for a stock-tolerance rebuild.
Specifications:
- Type: Main Bearing Set
- Series: A-Series
- Size: Standard
- Engine Fitment: Small Block Ford
- Part Number: 5M590A-STD
FAQ
What size is the ACL 5M590A-STD bearing set?
It is a Standard-size set, built to fit a stock, unmachined crankshaft main journal.
What engines does the ACL 5M590A-STD fit?
It is designed for Small Block Ford engines.
Is the 5M590A-STD a main bearing set or a rod bearing set?
It is a main (crankshaft) bearing set, not a connecting rod bearing set.
What ACL series is the 5M590A-STD part of?
It belongs to ACL's A-Series line of engine bearings.

