Hotrod magazine did an article on Rectangular port and GMPP heads held their own.
Have you considered the LsA heads which are cast differently and can handle the cylinder pressures better.
http://www.lingenfelter.com/mm5/merc...egory_Code=C40
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2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.
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