Normal Compression On Gm 350

Normal Compression On Gm 350 FAQ

What is the compression on a chevy 350 crate engine?

With a composition head gasket, the piston 0.020-inch below deck, and a 76cc combustion chamber, and with a composition head gasket this puts the static compression at 8.5:1. This really isn’t bad. The standard Chevy 290-horsepower 350 Chevy crate engine you can buy isn’t even that good.

How to test engine compression on a chevrolet or gmc?

Testing the engine compression on your Chevrolet or GMC 4.8L, 5.0L, or 6.0L engine is not hard to do. A compression test will help you to determine the health of your engine by measuring the pressure of the air that gets compressed by the piston rings against the cylinder head valves.

How much compression should my engine be cranking?

This is a rough estimate +/- 10% on the way you do your compression test. Obviously, this was for largely stock engines with mild stock cams. I've seen engines with 8.7:1 crank out almost 200 and I've seen 12:1 engines barely squeeze 150.

What should the compression be in a car with low compression?

A healthy engine should have 100 PSI per cylinder. If two cylinders next to each other both have low pressure, a blown head gasket is a likely culprit. If you discover you do have low compression, the only solution is to replace the leaking part whether it’s the piston, piston ring, camshaft, head gasket or valves.