Guys, 1OU155994 stamped on flange on a TH350. Something out of a 70? Thanks.

Its a VIN derivative

1OU155994

1 = Chevrolet Division
0 = 1970
U = Lordstown Ohio final assembly plant (big cars and trucks)
155994 = Last 6 digits of the VIN

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2002 Pontiac TA WS6 Ram Air
2001 GMC SLT Extended Cab Z71
1964 Chevrolet Impala 2 Dr Sport Coupe