[Old Truck Man]

My 71 3/4 ton had a factory 402. someone before me had installed hard valve seats in the heads. one came loose and wrecked the engine. It pulled heavy loads Ok. pinged and dieseled on low octane gas. guzzled gas. wasn't the fastest big block I ever owned. I installed a 454 that has lower compression ratio. Better all around. I was thinking of putting the 402 crank in a 454 block and building a 427.