Re: Heads

[Paul L <pjlenn@xxxxxxxxx>]

What I can offer is the difference higher compression made when I went
through my motor. I have a mid 70's motor w/ 916 heads.  My stock
pistons were about .100" down in the hole and the 916's are supposed
to have an 88 cc chamber.  What I did was use a KB piston with a lower
pin height to bring up the compression.  At the same time I had a
little porting done on the heads but it really woke that motor up.  My
mods probably brought my compression up to about where yours are now,
about 9.5/1

Paul L.
63 Sport Fury

On Oct 11, 4:57 pm, Jay <shelby_...@xxxxxxxxx> wrote:
> 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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