Mopars 1968 '383 Engines'

66fs said
I'm going to "believe" the Direct Connection Manual, since there is no way I'm going to run the small cam and weak valve springs. Thanks for confusing me with the facts...

That is a 'wise choice', and absolutely nobody should be forced to
use those 'weak' 208 lb. Load-Rate Valve Springs off of the 383
{'non' HP Engines}.

Are you aware that in the 'first' Road Runner magazine advertisement
{Hot Rod Magazine, September 1967} Plymouth listed the 'special'
Road Runner Engine Camshaft at,

.450"/.465" Lift ~276*/292" Duration ~ 54* Overlap