Just came across this .Looks like CC
http://chevellestuff.net/qd/th400.htmCode/Engine HP/Vehicle
CA - 350,396,400,402 (145,160,170,240,255,265hp) 2bbl, Chevrolet, Monte Carlo
CB - 400,427,454 (180,345,390hp) Chevrolet
CC - 396 (325hp) Chevelle, Camaro
CD - 327,350,400,402,454 (215,235,240,250,300hp) Chevrolet, Chevelle, Monte Carlo
CE - 396 (350hp) Chevelle, Camaro, Nova
CF - 402,427,454 (215,235,270,335,350hp) Chevrolet, Chevelle, Monte Carlo
CG - 396,454 (265,365,390hp) Chevrolet, police
CH - 427 (390hp) Chevrolet
CJ - 396,402 (
,240hp) Chevy Truck 10,20,30 series
CK - 350 (165,190,195,200,300hp) Corvette
CL - 427 (400hp) Corvette
CP - 454 (???hp) Chevy Truck C-10/20/30 series
CQ - 427 (335hp) Chevrolet
CR - 400,402,454 (170,215,235,240,270,360,390hp) Chevrolet, Monte Carlo, Chevelle, police
CS - 454 (245,270,360,365hp) Corvette, Chevelle, Monte Carlo
CT - xxx (???hp) Chevy Truck C10 & C20 series
CW - 402 (375hp)...Chevelle, Camaro, Nova
CX - 396,427 (375,425,430,435hp) COPO
CY - 350,396,427,454
(high shift point) (245,375,425,430,435,450hp) Chevrolet, Corvette, Chevelle, Camaro, Nova.