[Shiny]

Originally Posted by Kenth

Dennis, here is what i have on the 1974 350 units.
7044268/568, 72 jets 43 pri. rods, DB sec. rods #7047806, 1/2 airvalve spring preload, #7029529 power piston spring A, X BODY AUTO. TRANS. 350

7044269, 68, 35, DB 7047806, 1/2, 7037851, A, X BODY MAN. TRANS. 350

Why is there such a difference in primary jets between manual and auto? 68 vs 72 seems like a big jump. Is this typical?

[65 Lamnas]

Originally Posted by Shiny

Why is there such a difference in primary jets between manual and auto? 68 vs 72 seems like a big jump. Is this typical?

Not only the jump in jet sizes, but look at the combined flow area when considering jet/rod combo. It's hard to say exactly why the jump, but remember that jets, rods, and PP springs alone are NOT the only components that determine final metering of the primary side. The size of the MABs directly affects the metering, and the airhorns and float bowls are different P/Ns from AT to MT on the non-CA '74 350ci Qjets.

Only way to know for sure is to gauge the MABs, and one can assume they're a bit different which would explain the jet/rod differences.