My only guess is due to heat concerns. Has to be, with that small of a valve head I doubt it was rpm related. Still makes you wonder. Be nice if Tom could have sat down and asked ole' Barney these questions 35 years or so ago, saying, One day I'm gonna buy some of this old crap and want to know what is what and why you did it! -- Mark Price Morgantown, WV 1969 AMC Rambler, 4.0L, EFI, T-5 2004 Grand Cherokee Laredo, 4.7L, Quadratrc II " Chronic Pain Hurts" -------------- Original message ---------------------- From: Tom Jennings <tomj@xxxxxxx> > Sandwich Maker wrote: > > > sudden thought - bronze guide inserts! why for the exhaust and not > > intake... > > TYhere are inserts; but I don't recall accurately the material. Will check. > > But the stems on the exh valves really are that large. > _______________________________________________ > Amc-list mailing list > Amc-list@xxxxxxxxxxxx > http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list