10.25:1
10.5-1
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.
Compression ratio on a 1974 Chevy 350 in a Nova was 8.5:1.
8.5 to 1 compression is factory stock.
8.5:1
I don't know if there is an easy answer to your question. there are different h.p. engines in a lot of different vehicles of the same model. for instance if the vehicle was ordered for towing it may have a higher hp rating, there fore the compression ratio may differ. i think your best bet is to take the motor no. to your Chevy dealer and he can tell you exactly what you have for an engine. all 350's are not created equal. there are 350's with 200 hp and then there are 350's with better than 350 hp. the strange thing is that they look the same unless you know what your looking for. the compression ratio will most likely change with a higher hp engine with different pistons, and heads.
No. It lowers the compression ratio and reduces power output.
I'm assuming you mean static compression ratio. There were two 350 (5.7) engines offered by Pontiac. The standard engine was around 8.5 to 1. The HO version was factory rated at 10.5 to 1.
YES. That is a direct bolt on with no problems. The heads will bolt on, but the compression ratio will be different. Depending on which heads and which pistons, the compression ratio could be a lot different.
Pretty much any 350 Chevy engine from 1968 to 1987 will work.
4.000x3.750 with 8.5:1 compression
3.90