Specs

Motor1970 455 ‘YH’ + .060 (469)
Heads“6S-7” with 2.11/1.66 valves, port matched
Intake Manifoldstock Pontiac, port matched
PistonsTRW forged
Rodsstock 1962 389cid forged
Compression Ratio9.5:1
CamshaftComp Cams 276AH-10 (51-309-4)
Advertised Duration (Int/Exh): 276°/284°
Duration @ .050 (Int/Exh): 228°/236°
Gross Valve Lift (Int/Exh): .520/.520
LSA/ICL: 110°/106°
Rocker ArmsCrane 1.65 Roller Rockers
Carburetor800 cfm Quadrajet
ExhaustHooker headers, 2½”, Flowmaster mufflers, 2¼” tail pipes
TransmissionTurbo 400
Torque Converterunknown manufacture approximately 2500-rpm stall speed
Rear Type/RatioFord 9 inch, 3.00:1 open for street; 3.70:1 posi for strip
Fastest TimeSacramento Raceway; September 16, 1992; 13.099 @ 104.9 mph
WheelsCenterline 15 x 3.5 front, 15 x 8 rear
Paint1969 Pontiac Goldenrod Yellow (paint code #76)

My Build Sheet

My 1969 Firebird 400 build sheet