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Northstars should hold between 140 and 170 PSI. The number is not so important as the balance between all eight readings. They should be within 4 or 5 psi of each other.
Wiki User
∙ 15y ago
George Hayes
The balance answer is right but 150 to 160 is what I've usually seen on Northstars. If it's higher than 170, carbon buildup is always why. Unless they all are, then you have high compression pistons.
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