that might be why it's low, rings might need more time to seat.
typically 2800 miles is more than enough, but I've heard from more than one person the LS motors take a few extra miles

 

i have 60,000 plus and i am sitting at 160 across the board.

 

that sounds good to me.

 

To many variables are involved a stock cam will show higher readings than a performance cam, if a stock cam is advanced it will show a higher reading,with a non-stock 383 as long as the readings are within 10% of each other and the motor is performing properly don't worry about it.

 

175 or more.

 

Zippy, you work for a dealership or chevy right?

 

chevy dealer...