Originally Posted By 383man
Originally Posted By dan9
If I remember correctly the ads or road tests of the new RR and Super Bee stated that they came with 440 heads. Maybe that lead to a a lot of confusion. I have old mags from the era and I am curious about what they said.



I remember reading that in a 68 Roadrunner add. And the reason being up to 1968 the 383 and 440 had different heads. After that as far as I remember both the 383 and 440 used the same 906 head up to 1970. But before 1968 the 383 used the small 1.60 exh valve heads and the 440 the 1.74 exh valve heads.

I believe in 1967 the 383 in the A-body (Dart & Cuda) that was rated at 290 hp used the small valve 1.60 heads and the 383 two brl cam. I think in 1968 the A-body 383 got the large valve 906 heads and the 300 hp rating and in 1969 the 383 A-body got the better 383 Roadrunner/SuperBee cam and the 330 hp rating. All in all it sure can get confusing. Ron

On the 67 440 engine, hp=big ex valve, lp=small ex valve. Dad bought a 67 New Yorker for parts for his car, came with the 440-2 barrel 915 head small valve. I Had the big valve installed and used them on my 69 383. I think 67 was the first year for the big ex valve on a production engine (GTX type) Dads NYorker had the 375 engine in it, same as GTX-RT