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How about the horse power ratings of the 383 during the three years. I believed the '69 was rated higher then the '68 and the '68 was rated higher then the '67 383. I know the '69 got better exhaust manifolds then the '68. Maybe someone can chime in with the details.



The 67 version had 516 heads; carb was AFB, cam was standard 383 2bbl/4bbl with 256/260 duration, .425/.437 lift; exhaust was 2 1/4" head pipes and 1 7/8" tail pipes.

68 versions got 906 heads, better intake, AVS carb, same standard-performance 2bbl/4bbl cam as 67, and exhaust was 2 1/2" head pipes with 2 1/4" tail pipes.

69 versions were the same as 68 except for the cam, which was upgraded to the Road Runner/GTX hi-po cam, IIRC 268/284 duration, .450/.465 lift.

Passenger side exhaust manifold was the same all three years; 68-9 used a different driver's side manifold than 67. (440 used the 383 passenger side manifold, had a unique driver's side)

67 A-body 383 was rated 280 hp, 68 was 300hp, 69 was 330 (440 was 375).