amundaza I am installing SB Chevy valves in my 304 heads. Would there be any problems milling down the AMC valve guide casting and hogging them out for a 0.500" bronze bushing designed for SB Chevy valve stem diameter and seals? Here are two links to what I am considering. http://cgi.ebay.com/ebaymotors/Chev-Ford-THICKWALL-Bronze-valve-guides-flanged-EPN_W0QQitemZ120222187236QQcmdZViewItem?hash=item120222187236 http://cgi.ebay.com/ebaymotors/Bronze-Valve-Guides-Small-Block-sb-sbc-Chevy-Chevrolet_W0QQcmdZViewItemQQ_trksidZp1713Q2em153Q2el1262QQcategoryZ33617QQihZ010QQitemZ200199782272 These would work well with the SB Chevy seals: http://cgi.ebay.com/ebaymotors/Teflon-Positive-Valve-Stem-Seals-sb-sbc-Chevy-Chevrolet_W0QQcmdZViewItemQQ_trksidZp1713Q2em153Q2el1262QQcategoryZ33621QQihZ008QQitemZ180215375203 Thanks, Greg Taylor 🙂 <><