Join Date: Aug 1998
Location: Waldorf Md. USA
You really cannot measure accurately enough with a caliper. You need a micrometer and a dial bore gauge, or at least an inside micrometer. Your bore size really should be at least 4.060 unless the pistons were manufactured wrong.
Bit of info for everyone...each piston manufacturer has a different place they have you measure the piston. Some do it at the bottom of the skirt, Wiseco typically says about 1/2" above the skirt, but they vary. Others measure at 90 degrees from the wrist pin bore. The point is...you cannot guess at where to measure...you have to read the instructions that come with the piston. Sealed Power / Speed Pro actually prints a minimum bore size on the lable of the box. On thier skirt coated pistons you cannot measure the piston, you have to finish the bore to the size on the box, or larger, depending on the intended use of the engine.
Once again...you cannot guess, or go by what another piston manufacturer does...you hve to follow the instructions for YOUR pistons. Period !
Hope this helps,
Advanced Automotive Machine
1971 Chevelle "Heavy Chevy" original owner
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