I just purchased a 1969 350 375HP GM Goodwrench Replacement Engine (real cheap) from a guy (2nd owner) who never got around to using it. He said he was told by the person he got it from that the engine had to keep the heavy steel double pulley on the crank because it was balanced from GM that way. Does that sound correct. I want to put it in my 1967 Opel Kadett to mock up and make a few run s to get the chassis worked out. But I want to take that double pulley off. Will that cause any problems with the engine. When I am done using the engine I have a Kid who wants to buy the engine. I don't want to hurt the engine but I need to remove the pulley for clearance reasons.

As a side issue. Any quess on what I can expect in the 1/4 with this engine?

1700 lb car with engine, aluminum glide , 8 3/4 rear ( not sure of the gears, I just bought the roller 2 weeks ago) ladder bars and a large driver.
Thanks for all replys
Tom aka Big Daddy Teez

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Big Daddy, I hope you plan to tear down that motor and inspect it to make sure of what you have and to ensure the cylinders are rust/pit free and the rings are free in the grooves. You also want to relube the cylinder walls and cam lobes and reprime the lifters before firing it up. Also, you need to post the casting numbers on the block and heads so we can verify what you really have (unless you have already done so). The pulley should have nothing to do with the balance of the motor. I think the seller may have been confused. A small block 400 would require the harmonic balancer (as well as the proper flex plate) because it is externally balanced.

Trees

Yeah, what he said.