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Would like to know everyones oppinions on the early (71-74) LA 360 blocks (3418496) vs the later and why. As well as what known differences there may be, or rumored and proven to be.

Heres the deal: a friend had some problems with his 408 (cyl split) and needed a motor asap to run nmca at indy this weekend. I loaned him my 373" backup bottom end for the event. 72 340 block, 4.071 bore (bit loose) 3.58 stroke 360 crank, mains buzzed down to 2.5" Stock late 70s 318 rods...