Grand-Spaulding Dodge - Mr Norm's

YY1 said
However, the 383-4 was a 10:1 motor in 66/67, while the 383-2 was 9.2:1.

Are you positive the cam and ex valve was the same a 2 barrel motors?
Click to expand...


1966/1967 '383' 2-Barrel and 4-Barrel {Same Components}
* Camshaft..............{.425" Intake ~ .437" Exhaust}
* Cylinder Heads.......#2406516 Castings
* Valve Size.............{2.08" Intake ~ 1.60" Exhaust}
* Valve Springs
* Exhaust Manifolds
* Distributor

Different Components
* Pistons
* 4-Barrel Intake and Carter AFB {575 CFM}
* Dual Exhaust

There was a 'big' disparity in Horsepower between the 383/325 HP 4-Barrel and
383/270 HP 2-Barrel.

The increase in Piston Compression (10.0-1}, Carter AFB {575 CFM}, 4-Barrel Intake
and Dual Exhaust for the 383 4-Barrel was in 'no' way {+55 Horsepower} over the
383 2-Barrel.

Nobody raced the 383/325 HP at the Drag Strip with any success in Stock Class.

More guys had success with the 383/270 HP 2-Barrel in Stock Class Racing, as it
had a better weight-to-horsepower factor.