1971 #96 heads will not have induction hardened exhaust valve seats.
GM had the induction hardening process in place across the board by the 1973 model year, not 1971.
There were some 1972 heads that got hardened seats but as a general rule most will not have them........Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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