400 c.i. V8 (casting # 3951511) CSI Suffix Code The casting number 3951511 belongs exclusively to a 1970–1973 Chevrolet Small-Block 400 c.i. V8 engine block Tremec 5 spd manual transmission (CCEX17265) 10 bolt rear end Original 'Matador Red' (Factory Color Code R) paint. Original Dtabndard Black Bucket Seats Interior (Trim Code 712) Norwood California Built Car