valve unshrouding + porting and polishing intake/exhaust ports

[Mark Romans]

AFR heads are really good heads, probably the best on the market.  If they
didn't improve performance, then porting and unshrouding the valves on the
AFR heads won't help any more either.  What this means is that your stock
heads were not the limiting factor.  If you have a restricted exh, due to
say a partially plugged convertor and install AFR heads, then they won't
improve performance.  The engine needs to be addressed as a system.  I
suggest you take a look at the TPIS web page.  They have a book called LT-1
Hints and L-98 update that has pictures and flow tests of all the individual
components in the system.  Their stuff is expensive but does work well.
Mark
-----Original Message-----
From: Abdullah AL-Kandery <afraccel at moc.kw>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: Saturday, July 31, 1999 7:00 AM
Subject: valve unshrouding + porting and polishing intake/exhaust ports


>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
>