Big Valve X Heads on Low Comp 72 340

65 Cuda 340 said

Back in the day (1978), I put some cheap Blackjack headers in my otherwise stock low-compression daily driver 73 Duster 340, 3.21 open rear, and picked up over half a second in the quarter (15.0s to 14.40s). Would have done even better, but the headers gave me so much more low end that now I had a traction problem. Headers also raised my shift point from 5200 rpm to 5800 rpm. Except for the headers, the exhaust system was factory stock.

I traded that Duster for a 1982 Charger 2.2 in November of 81. My first new car. Dumbest thing I ever did. . . .

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My 73 340 Duster has the OE low compression but it has a different cam, 224* @.050, and LD340. Same gearing, 3.21 open. OE replica bent exhaust and tips. She’ll bark when power shifting to second.
I have a set of TTi shorties in the box I am wanting to put on. Peter Bergman also sold me a 2.97 3rd with True Trac for when I switch to the 8.75 and I have a spare 3rd to have optional gearing.
My heads are a Z and a O head, which I’ve heard are good.
Eventually I would like to up the compression and have a friend port the heads and match the intake.
This is good info.