273 cam selection on Desktop Dyno

You need a can that is high lift short duration and low over lap.

I have built many a 273 and raced them in years past dataing back to early 70s.

The D dart and performance even 235 HP 273 used a cam metioned as above. In the D dart it was a racer brown cam that speced to over .515 lift and a advertised 260 duarion stick. The little motor needs all the low end it can get.

I played with the 340 cams, purple shafts 260, 270, 280, hemi grinds etc. All yeilded very poor low end below 4000 and peaky torque curves.

Isky used to make a stick better than the E4 it is no more, you could have a custom ground cam, I think I would look for that type of a solution rather than rollers, high ratio rockers etc.

I was able to put 275 HP to the tires in my 273 at 7500 crankshaft RPMS to the rear tires, and 245 HP to the tires at 6000 RPMS. HP & Torque was still decent at 3000, but the stock 1800-2200 rpm torque peak on the 2V motor will go by by. You also nede to get more compression, at least 10.5 with the bigger cams, and a lot of base timing too.

good luck!