Can I use 305 heads on a 350?

Can I use 305 heads on a 350?

I did the 305 heads on a 350 in the mid 80’s, using just plain “smog motor” small valve heads. The theory being that smaller valves work better on the low end, and the smaller combustion chamber will boost compression around a point.

What heads can you put on a 350?

The more cubic inches the engine has, the more airflow the heads have to deliver. A head with 180 or 185cc intake runners will work well on a typical 350 Chevy street engine that makes 400 to 450 horsepower.

Can you put 305 heads on a 400?

I still wouldn’t put the 305 heads on a 400 – too much valve shrouding for any performance gains. Also the intake/exh runner volume is about useless. I had a set of small chamber heads (58cc) of a 307 or 283 or 305 or whatever and had them cut for 1.94 intake valves (cheap) the motor was NOT impressive!

Can cylinder heads be too big?

“Super-sizing” may be a bit of an exaggeration, but cylinder head buyers have been known to opt for valves that are too large. That can result in cylinder heads that don’t fit an engine’s performance needs—or the actual engine itself!

Do aluminum heads make more power?

Aluminum heads will dissipate heat faster. This allows for higher Compression Ratios with less risk of Detonation. The cooler head also delivers a cooler air/fuel mixture to the combustion chamber. Cooler air is denser and can make more power.

How much horsepower can a 305 handle?

450 hp
I completely agree that a 305 can be built to make 450 hp. That’s not too difficult. The engine is limited to smaller heads with 1.94-inch valves because larger 2.02-inch valves won’t clear the cylinder wall.

How much horsepower can you get from a 305?

So a 305 up against a 350 (even at the same horsepower) will always lose to the larger engine because the 350 will make more torque. I completely agree that a 305 can be built to make 450 hp.

Which is better open or closed chamber heads?

Open and closed chamber cylinder heads differ in combustion chamber capacity. Although open chamber cylinders offer easier flow, the closed chamber cylinder is better for performance. Compression ratios are also affected by the size of the chambers.