Nailhead question?

[Guest]

Can you put 401 or 425 heads on a 322 engine? How bout 425 heads on a 401?

If this can be done, would it buy you a nice increase in Horsepower?

Does anyone know of a really good Nailhead engine shop?

[Turbo Loyd]

[color:"blue"]Do not know if they would physically fit, but generally the larger displacement engines would have a larger combustion chamber. This would lower the compression ratio and probably lower the output. There may be issues with the size of the valves clearing the limited cylinder diameter as well.

I would assume you should be able to port the heads for the 322 to obtain the goal of increased air flow in and out. You are limited by the small valves after all with all nailheads. There are new porting tricks to increase velocities through small valve heads thought.

Would assume 401 and 421 engines use the same head with slight variations.

Off hand I do not know of a good nailhead engine shop.

[Guest]

What about 390 heads on a 322?

[Guest COMPACTBC]

You should post your question to the nailhead discussion group at www.NailHeadBuick@yahoo.com where you will get very good answers on all your questions regarding these engines. <img src="http://www.aaca.org/ubbthreads/images/graemlins/tongue.gif" alt="" />

[Guest]

The 401 and 425 engine heads are the same. the engines are alike except for the larger bore on the cylinder. anyone need an engine or extra parts contact me.