67' Barracuda 273 (Camshaft Results at the Track)

Stroker,

Some 273 Engines are 'Freaks',,,,,,

No Rhyme or Reason.

We ran several 273 Cars (Barracuda's) back from 1967 thru 1972.

We built 'two' with identical components, and one ran 13.70's @ 103 MPH and the
other ran 14.20's @ 98 MPH.

The 'stock' 273 Commando had 'peak horsepower' at 5200 RPM's, and a
'Red Line' at 5800 RPM's - but many have pulled higher RPM's with little trouble.

This I can attest to, when we ran one of our 'stock' 273 Commando's in our 1967
Barracuda 4-Speed with 4.89 Gears {1968}, classed in J/Stock.

When going thru the 'traps' the valves floated out at around 6000 RPM's and we
bent every valve.

From my information sheet, the 273 Commando was equipped with 'stock' valve springs
that had a load rate of #103 lbs. (valve closed) and #184 lbs. (valve open).

But some, when tested ('Rimac' Valve Spring Tester) had a load-rate between 205 -215 lbs.

Also, we 'split' several of the 'hourglass shaped lifters' when hitting high RPM's.

Like I said, some 273 Commando's were.............'FREAKS'

Below Camshaft and Valve Specification Details