'383' ~ 1967 325 HP vs. 1968 330 HP vs. 1968 335 HP
Did N.H.R.A classes allow tire size/compound change/ chassis tuning ?!?!?, in these middleweight classes? This might make up, for some " horsepower factoring"....
Back in 1968.
NHRA Stock Class
Maximum Width Slicks .......... 7"
Shocks ............................... Any Type
Traction Bars ...................... Allowed
Engine Blueprinting
Dykes-type Piston Rings
Forged-True Pistons ............. Factory Rated Compression
Cylinder Heads .................... CC'd to NHRA Minimum Specs
Headers .............................. 3.5" Maximum-width collector
Stock Exhaust System .......... Had to be installed on car
Electric Fuel Pump ................ Allowed
Re-location of Battery to trunk. Allowed
Chassis tuning permitted. But, the cars were to maintain a 'level position'
at standstill.
Lots of guys were attempting to get a 7" travel {lift} from the front-end when
launching from the line.