1971 340's True HP?

krazykuda said
I would argue that the single exhaust is the biggest restriction on them, then the carb...

The performance increase on my 70 318 swinger increased greatly when I had a 2 1/4" dual exhaust with an h-pipe installed, even with a 2 bbl it ran much better...

But putting a dual exhaust and upgrading to a 4 bbl will really wake up a 318...

Small outlet manifolds also, not an high point.

RustyRatRod said
Exactly how Mopar wanted it. Had everything on the 340 been available on the 318, it would have been too close a match. The 340 had to stay on top of the small blocks.

Most export markets never got 340s- they got the American HP engines when the 360s started to show up for their home market MoPars. Only reason I can understand is if they weren't putting the blocks in trucks it wasn't worth putting them in cars.

67Dart273 said
I cannot even name "em all" anymore. Plus, the 340 was never produced in huge numbers comparitively

It always had limited availability. It started as the hot motor for the small cars and was never offered in a midsize until '71, and then discontinued in '73 stateside.

The bore doesn't make a huge difference. The manifolds, the heads, and the cam do though.