Heads

[Jay <shelby_nut@xxxxxxxxx>]

Hi all,

 

   So got a bad head gasket in the 383 in my 64 Newport Convertible, so time to pull the heads.

 

They are the original 516 castings, and, based on the variety of valve tip heights (and the fact that I had to shim the rocker shaft on one side just to get one valve to close all the way), they need some help.

 

I have a good set of 452 heads, they have the hardened seats and the larger 1.74 exhaust valves, but are open chamber heads.

 

The 383 in my car is a 1966 2-bbl engine, with 9.2:1 compression.

 

If I use the open chamber heads anyone know how much compression I will lose?

 

And with the better flow and larger exhaust valves in the 452's help make up for it in performance?

 

Any insight would be appreciated!

 

Jay

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