'89 roller-cam LA 360 w/Magnum heads - new roller lifters not pumping up

Look at the engine ID pad (front of block, left bank) and see if a Diamond shape <> is stamped in. If so, one or more lifter bores were oversized at the factory .008 Also any oversized lifter bore would be stamped with the diamond.

"Engine ID pad" - are you referring to a B/RB engine here?

I haven't seen a smooth ID pad on the LA's, only the engine casting number on the left side:



-Kurt