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8.5 to 1 compression is factory stock.
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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.
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.
then youre running about 8.5:1 compression
what is the timing on a chevy 350 It depends on the compression ratio and the quality of the fuel, but 8 degrees before TDC is a good place to start. Then try increasing 1 or 2 degrees at a time until you notice pinging or it's hard to start when hot.
No. It lowers the compression ratio and reduces power output.
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.
4.000x3.750 with 8.5:1 compression
Good compression, good heads, good cam.
The firing order of a 1974 Chevy 350 is 1-8-4-3-6-5-7-2
The average compression test reading for a Chevy 350 small block engine is around 150 PSI. Lower pressure indicates that there is a leak in the engine.
3.08 makes a good ratio for economy. 3.55 for more power when towing.
driver's side, through the block.
Probably not. 400 heads came with 1.94 intakes and 1.5 exhausts, and many of them had 76cc chambers. If the 350 has smaller chambers the 400 heads would lower the compression ratio, thus reducing power.
around 80 ft.llbs. or higher is usually good.
Yes you can. Be wary that if there is much of a difference in combustion chamber size you will be affecting the compression ratio. As an example, most of the 350's in 1975 had the 76 cc chambers. If you put a set of 58cc heads on that block, your compression ratio would go from about 8.5:1 up to something north of 10:1. This would make more horsepower, but is not pump gas friendly.
If any two adjacent cylinders have low compression it's probably caused by a blown head gasket.
No. Not without switching the cylinder heads. I think it was 89, Chevy came out with the 1st generation Vortec heads, which require a different intake.
It is a 1976 Chevy 350
When that type of combination has been used by the OEM the compression ratio was around 10.5:1.
Almost impossible to answer that question. The viscosity and temperature of the oil would factor in, along with the compression ratio, bearing clearances, spring pressure and type of cam, etc.
You will need to have the heads for the 305 bored out to the same size as the 350. I disagree: you can use the 305 heads on the 350 block but you will increase compression as the 305 heads have a smaller combustion chamber. The critical dimension is valve clearance. If compression ratio is a critical consideration, different pistons may be available which will bring the combustion chamber back to size. the 305 is from the 3.671 inch bore family. The 350 is from the 4.00 inch bore family. All small block heads have the same bolt pattern.
check your rotor & pickup coil
head gaskets??? warped heads? did you have them milled?
350 Chevy's have been around for 40 years, and the horsepower has varied from a low of 145 horsepower to over 400 in factory configurations. It depends on the compression ratio, type of heads, cam, intake, exhaust, and many other variables.
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