Customer brought me a short block to fix, ate 3 lobes off of the cam, long story short, i know its got KB pistons with that goofy compression step, and valve relief, it got a set of H beam rods I believe to be 440 source. but I cant find any definitive info from them on if its a source rod or not. Only thing on the rod is a laser etched number, 3960W.

Customer had a set of Indy heads already bought for it, and is going hydraulic roller, and I know he will be fairly hard on it, and I dont want a parts failures and have read horror story after horror story about Source rods, and Hyperutectic KB pistons.

Can anyone ID these rods?