How much compression should my engine have?

Question

how much compression should my 91 corvette 350 engine have

Answer 1

between 145 and 165 psi, and within 10% of each other.  

Answer 2

This is the manufacturer's specification straight from all data for that car

The lowest reading cylinder should not be less than 70% of the highest and no cylinder reading should be less than 689 kPa (100 psi). Perform compression test with engine at normal operating temperature, spark plugs removed and throttle wide open

Answer 3

145-160 in each cylinder.  

Answer 4

compression rating,s vary depending on the specific engine & mileage on the engine..also maintance history.    rather than look for a specific compression number look for uniformity in all cylinder,s.  if all cylinder,s are within 10 to 15 pound,s of each other ..you are fine...if you find one farther off than that then that cylinder has a problem..good luck!

Answer 5

if it were mine and I had aluminum heads, I would prefer 10.8:1 cause it would make power but still run on 92 octane pump gas.  But with iron heads, like 9.8:1.

or did you mean cylinder pressure

Answer 6

If the worst cylinder is within 5% of the best, then it's good.