using acl standard for my ls block. plastic guage to specs and found 2 rods and 2 mains to tight. what oem bearings will i need for the mains. i know that for the rod i can run b16 rod bearings with one or two size down. just not to sure about the mains. not planning to run oem bearing. correct me if im wrong.

 

um, the main bearings will also be colored like the rod bearings... but i dont know the answer

 

do the plastigage again, sounds odd

 

Honestly if the plastiguage isnt in spec(persay) then you need to measure the journals and housing bores and have the rods or main bores honed to get the proper spec using the ACL's you have. If its too loose then you can use the same math to calculate what factory bearing you can use in its place.

I had to do this with my gsr motor upon assembling. ERL did a good job and got all of my bearing clearances where I wanted them, align honed the block, and wrote down all of the measurements on a sheet/ What a piece of mind it is...