In 1968 I helped a friend of mine rebuild a Pontiac 421 engine from his 1965 Royal Bobcat GTO.
Friend was not mechanically inclined but eager to learn.
I was working part time at a local automotive parts store/machine shop at the time and bought the parts so as to get my discount.
Was working until 5:00 PM so advised friend to wait for me before starting reassembly but he did not.
He installed the mains and crankshaft before I arrived and told me that after torquing the mains the crank would no longer turn.
Turns out that the Victor gasket set had two rear rope seals so he installed both, one in the proper grove, the other in the grove where the oil slinger goes. Of course, tightening the rear main cap caused the slinger to badly interfere with the superflous rope seal. To make matters worse, he torqued the rear main cap to spec cracking the block in the process.
Are you ready for this: It was a Super Duty 421 block. Very rare, even then.
I used my discount at the local Pontiac dealership to order a new SD 421 fitted block. Price was nearly $200 with discount, quite a sum at the time.
FWIW, friend still has the 65 Royal Bobcat 421 complete with 4:33 gear.
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