Pure stock 340 Mopar

[X-TECH MAN]

Originally Posted by James L Miller

I think the current NHRA specs for a 1969 340 still apply to Pure Stock. The cam lift is higher on the exhaust. I think the service manual lists it as .429"/.444" or something like that, but Chrysler fed NHRA some enhanced numbers way back when.

HP Disp Deck Cl. Valve notch Int./Exh. Valve Cam lift
275 340 DP .045ab Flat w/n 5.45 cc 2020/1600 462/473 .035 Outer w Damp

I have 2 sheets of specs. The one dated Feb 1969 lists the lift at .467/.473 in one book.The duration is the same. The other sheet in my other book I have is dated the same Feb. 1969 but lists the lower lift . Go with the higher one. Chrysler did some funy things back in that era. Its good that you caught it.
Thanks.