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Old 12-23-2008, 09:10 PM
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3973487....71-72...350..........1.94/1.5 or 2.02/1.6 valves, was also used on '71 350/330hp LT1, 75cc chamber
3973487X...71-72...350..........1.94/1.5 or 2.02/1.6 valves, 75cc chamber

If your heads have a 1.94" intake valve and pressed in rocker studs, they did not originate from a Z/28 -LT-1 motor.
One of the better of the smog era heads. Check for cracks reguardless.
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