273 power? HOW?

Was 315 HP at the crank and displayed 245 to the rear at 6200rpm on a clayton dyno.

I have a holley street dominator for the 273 for sale, works good, you can open up the ports some, do a good 4-5 angle valve job, back cut the valves, go with a solid cam and stiff valve springs. If you do new guides you could get a 1.55-1.60 exh. and maybe a little bigger Intake, but the cylinders need to be nothed if you get to big then you get shrouding etc and ruin flow a bit too.

You need a .480 to .500 lift cam with short durationand a fast flank to match the early D darts that made 275 HP. Good ignition, and a 625 AFB is enough too.

They are a little sanppy but once in the 3500 and up range pull very decent. Just dont over cam for a street car. And I would not get to crazy on other heads as mentioned either. Actually the early heads have a quench are that allows more compression which if you go with more ill be required, so stay about 10:1 or less but not under 9:1 or low end really suffers.

Also I found about 2800-3200 stall is good with a 3.55 for a street car, more like 3.91 if you do little freeway use.

I have several 273 parts up for sale so maybe I could save you a few $$s.

enjoy!