I believe all SBC chevy heads with factory installed 2.02" intake valves were relieved with a cutter in the combustion chamber to reduce shrouding. This could have been as early as 1962 or 1963. On the 340292 Turbo head OTC, the cutter diameter was reduced slightly.
Paul
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70 Camaro LA Z-28 03B Citrus Green LT-1 M-40 3.73's
69 Camaro X-77 Z-28 10C Cortez Silver M-21 3.73's Deluxe Project X - SOLD
69 Camaro X-77 Z-28 01B Garnet Red w/Black top, M-20 3.73 Deluxe Houndstooth
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