Normal compression for a 350 Chevy engine typically ranges from 160 to 180 psi per cylinder, depending on factors such as the specific engine model, its condition, and the type of cylinder heads used. Variations can occur based on the engine's age, wear, and modifications. Consistent readings across all cylinders are crucial for optimal performance. If readings are significantly lower than this range, it may indicate issues such as worn piston rings or valve problems.
My truck runs about 140 psi, but was rebilt recently. 120psi is normal for a truck with normal wear.
then youre running about 8.5:1 compression
around 80 ft.llbs. or higher is usually good.
head gaskets??? warped heads? did you have them milled?
150 LBS. per cylinder. If you hace more then 15 LBS. difference between any cylinders the engine will idle rough and not run good.
Compression ratio on a 1974 Chevy 350 in a Nova was 8.5:1.
The compression ratio of a 350 Chevy engine usually ranges from 8.0 and 9.0 to 1. This provides a good balance of fuel economy and power.
8.5 to 1 compression is factory stock.
the firing order for a small block Chevy 350 is 18436572
About 8.5 to 1
10.5-1
Remove all the spark plugs and turn the engine over by hand. Place your thumb over the #1 plug hole and you will feel the pressure on the compression stroke. A compression gage will also tell you when you are on the compression stroke.