valve unshrouding + porting and polishing intake/exhaust ports

[Rod L Davis]

A 20% increase can be achieved in the 1 inch area either side of the
valve also backcutting the valve any where else the numbers are small.
Get a chevy high performance book will guide you through porting from
your chevy car dealer. In porting always do a little work on each port
to match each other , and cc the chamber. Back issues of this years HOT
ROD mag showed flow bench results of porting.
rodldavis @home.com

Abdullah AL-Kandery wrote:
> 
> i have AFR 190cc LT1 heads on my 94 camaro. they didn't give me
> any performance gain. is that mainely related to valve shrouding. you
> can see my heads at :
> 
> ftp://efi332.eng.ohio-state.edu/incoming/AFRchamber.JPG
> ftp://efi332.eng.ohio-state.edu/incoming/AFRintake.JPG
> ftp://efi332.eng.ohio-state.edu/incoming/AFRexhaust.JPG
> 
> to check them. also is the
> performance gain limited by the bad design of the intake/exhaust ports?
> do intake/exhaust ports need reworking?,  how to unshroud the vlaves?
> and
> how to fix the ports if they need fixing (polishing or porting or both)?
> let me know, TIA.
> 
> Abdullah
> 94 Z28