'1967 Holiday Race' ~ Plymouth GTX 440 vs. Pontiac GTO 400 'Ram Air'

69 Cuda 440 said

1967 Plymouth GTX 440/375 HP

Bill Stiles {October 1966}

Even in 'all stock form', the Carter AFB does not provide enough fuel for the 440.
It starves out badly at Top End. The engine needs a lot more air-fuel flow.

If I built this car out for a 'legal' NHRA Stocker. We'd be in the Ballpark for a
National Record. But that AFB Carburetor would hold us back. It's too small.

Put on a Holley 800 CFM Double-Pumper with an Adapter-Plate Spacer,
and I'd get bury the NHRA {C/SA} Stock Class Record with no problem at all.

Click to expand...

I have a 50,000 mile bone stock '69 383 Roadrunner. Even with the AVS, it's way under carb'd. I bought the car with a Holley vac sec 750 on it and tuned it best as possible before I found and installed a correct date coded AVS. I spent a lot of time dialing in the AVS and even then, there still is no comparison. The car flew (for a stock 383) with the 750. Not sure why but it seems other than the factory multiple carb set ups, Mopar under carb'd the 4 bbl cars until the T-quad came out.