Thread: chevy small block 355

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well the casting of the block wasn't the best. It's a first gen chevy motor. I placed the piston in number 4 and it didn't slop around from pushing to side to side. I have no clue whats the noise is coming from. someone told me to put 10w30 mobile full synthetic oil in it. i did that. and it knocks on cold start ups, but goes away when it's warm. When the people drilled the cylinder walls for the block, they weren't perfectly lined up. everything is new on this motor, besides the block.