So, it sounds like the 10.5 clutch is the reason for a different engine suffix than a regular LT1. That actually makes all the sense in the world since bellhousings have orange overspray after being painted on the engine at Tonawanda. Clutch & PP plates were obviously installed at Tonawanda before the bellhousing and not at the final assembly plants.
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1962 Biscayne O-21669 MKIV/M-22
1962 Bel Air Sport Coupe 409/1,000
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