[DeTomaso] Fw: exhaust ports on aftermarket heads

[JDeRyke at aol.com]

In a message dated 12/3/07 10:26:57 AM, daniel.c.jones2 at gmail.com writes:

> CHI says the 3V exhaust bolt holes are raised 0.4 inch. The high ports were 
> raised considerably higher than that. Phil (in London) has a set of CHI's 
> coming my way. I'll measure them and will take pictures comparing the port 
> locations of the CHI, Pro Comp, A3, C302B, iron high ported 4V,
> along with iron 2V and 4V. CHI 4V heads have standard height intake and 
> exhaust ports, designed for people that don't want to have the hassle of changing 
> intake and headers.
> 
We're bolting headers onto surfaces that are close to 45 degrees to the 
horizontal. Due to geometry, headers move sideways by a predictable ratio. On my 
SVO A-3 exhausts, redrilled Hedman hedders moved outboard far enough that #6 
pipe hit the fuel tank and shield, and at their lower ends, the collector and 
flange on both sides hit the rear coil-overs. Both were correctible with some 
trouble, but without correction, I couldn't even get bolts started in the header 
flanges. Depending on your facilities, one may need custom headers for some 
'hi-port' heads in a Pantera and it'll be interesting to see which do. FWIW- J 
DeRyke



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