had a friend snap a valve head off on his older TW heads too...
http://members.home.net/caprirs2/byrd/indexbyrd.htm
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84 convt,'95 302,AFR's, performer
3.55's, underdrives stock shorties
stock cam, 1.7's
14.16@100.08, 255RWHP on a hot day
265 on the mph/weight chart