As Freddie said, a 2 bolt block is fine for street use. Find a 2 bolt 512 cast block and they are the same as the 4 bolt. I bought Freddie's 427/390 engine last year for just this purpose. It is standard bore and with a forged crank. The cast cranks and low performance rods were the main reason 2 bolt engines blew up at high rpm, not any fault of the block. Build the internals properly with a 2 bolt and you won't have any issues.

I might have a friend in MI who might have 1-2 blocks I'lll check.

I have another standard bore '69 512 short block. It's a 335 horse.

How much are you looking to spend? To buy caps, machine properly and align hone youll have $1000 in the transformation and it probably wont be done properly like factory. Youll get ground valve reliefs etc etc let me know your budget i have a garage full of them still

Stock 2-bolt BB is good for 500hp+ - that's not the weak link.

Always remember to answer the question: what problem am I trying to fix? :)

Jeff is selling off his dad's parts, some 2 bolt 454s, about 6 of them, located in Western MI.

One rare one, think's it is a 1969 Chevelle L78 block for 4 speed car.

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