When you run a compression test, you are really looking for a cylinder that is way out of line with the others. 40, or 50 lbs lower than the rest, would indicate trouble. As for a number, well there is a lot that contributes to the actual answer. On my race engines, I come in as high as 180, to 200lbs. A motor with 80,000 miles, and 8:1 compression, would be lucky to put up 100lbs.
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.
that was supposed to be 11:1 compression
10.5-1
About 8.5 to 1
then youre running about 8.5:1 compression
4.000x3.750 with 8.5:1 compression
Good compression, good heads, good cam.
around 80 ft.llbs. or higher is usually good.
If any two adjacent cylinders have low compression it's probably caused by a blown head gasket.
It could be the timing chain/sprockets marks are not lined up correctly or the valves are not adjusted correctly.