Thread: 400 SBC rebuild advice!

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Danny,

The best way to determine if a basic rebuild will work for you is to use a micrometer to measure the diameters of the pistons and cylinders and determine what the clearance is. You need to measure the cylinders at several points up and down the cylinder to make sure they are not worn more at the top. Off the top of my head I don't know what the clearance specs are for your motor. I suggest that once you have it apart, take the block and pistons to a machine shop and ask them to "mike it" (measure with a micrometer) for you. That way you know for sure what you are starting with. It should only take them a few minutes and any charge would be minimal, if they charge you at all.

If the clearance is within specs your plans to freshen the motor up should be fine. Be sure to inspect the other components carefully while you have it apart.

Good luck with your project

Pat