1972 Demon 340 engine mods

SLOPAR72 said
Here is a recipe for a car just like this from back in the day....

Mopar 280 Purple Camshaft
273 Adjustable Rockers
Mild shift kit
4:30 gear

Everything else was left stock including factory exhaust to the tips. Car ran 12.90's with a sticky on the back. I am sure there are plenty of other recipes but I saw this one for myself and it flat worked....

It boils down to what the owners expectations are. Personally the original drivetrain would go in the corner and I would go over 400ci but then you will be changing other aspects of the car and once that train starts moving everything changes lol.... Post some pictures of it if the car is all original. Hard to find a demon like that these days lol...

JW

Your experience differs greatly from what i have ever seen. Had a bone stock 70 340 Duster that needed way more than a cam and more gear to get into the 12’s........ way more. Your talking a car picking up a couple of seconds in ET. Great results friend
But its way off from anything like that i have ever experienced. I needed headers, and other boltons to get there, think i even had to use aftermarket convertor.
My little brother has a 71 Dart with 10.5 compression 340. 202 heads, comp flat tappet cam, 3500 convertor, holley 750, aluminum intake, 4.11 gears, headers, and it runs 12.70’s in good air. Well sorted out little combo