462624 head flow numbers. Which pair of heads are great for a mild performance engine? Also which of the two are worth putting money into? Dec 20, 2009 · Finding Old School Cylinder Heads (462624’s) One of the great finds for this project were some older GM Performance Parts (GMPP) iron heads. They have huge valves in them and would like to know what I have. 3 62 1976-79 358741 305 1. SBC Head Casting Numbers Head casting numbers and the head casting date are located under the valve covers, in the rocker arm valley. 94” intake valves, 1. Tags 462624, aftermarket, building, casting, casting462624, corvette, head, heads, high, intake, l82, number, performance, ports, sale Back to Subforum Engine Mods View Next Unread Cams / Gas consumption "I must be getting OLD" Thread Tools Show Printable Version Search this Thread Click for Advanced Search Thread Tools Show Printable Version Jan 27, 2013 · I have 462624 Heads Brand New and 3973487 heads used off my old block. 02 1. 50" or 2. 94 1. 5001 74 1971-73 330862 400 1. fgep xtsmt foxjn ouvjm rlwz wrpos gbe frnoblmn jpqc zlyji