NHRA Horsepower Ratings for the 273

Tool Man Mike,

We ran a 273/235 HP Commando back in 1967, with a 67' Barracuda Fastback.
And ran it from 1967 thru 1971 in Stock Class.

Since we bought the car 'practically new' in 100% stock trim, we had a chance to
have it tested on a 'new' Bear Dyno Machine.

I can't remember the exact numbers, but it was not near 235 HP @ 5200 RPM
'at maximum level'.

Carter AFB Carburetor = 1 7/16" Primary - 1 9/16" Secondary
Venturies = 1 1/16" Primary - 1 1/4" Secondary

CFM Rating = 500

Camshaft = .415 Intake / .425 Exhaust - 248* / 248 * Duration - 26* Overlap

Valve Spring Pressure = 210 lbs. (w/valve open)

Cylinder Heads = 1.78" Intake / 1.50" Exhaust

Port Size - Intake = 1.70 square inch / Exhaust = 1.25 square inch