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We did a compression check & found the readings on our 383 stroker to be 165, 180, 180, 175, 170, 195, 170, & 190. Are these variations normal, or is there an issue somewhere?
 

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A little variation there but I wouldn't worry about it too much unless you are having an issue. 10 percent variation is normal. You're close to that. You did the test with the motor warm? How many miles on the engine? You could always run another test to compare the first numbers against.
 

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Discussion Starter #3
Engine was not warm. Do not know the mileage, but it was running strong and not smoking. We did a second check on #2 & got 165 both times.
 

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If it’s running fine...i wouldn’t be worried. Engine should be at operating temperature to do the test. The rings will seal a little better that way.
 

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I use a compression check for 2 things, to see what cranking compression based on the cam specs to see how its doing and for gross failure. Your engine looks fine.
 
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