Found this while surfing: Any thoughts?


As with the FE line of engines, Ford also offered Cobra Jet and Super Cobra Jet versions of the 429. The Cobra Jet, rated at 370 hp, was equipped with a Rochester Quadrajet carburetor, larger camshaft, 11.3 to 1 compression ratio and a special set of cylinder heads. The Super Cobra Jet, rated at 375 hp, had a 4-bolt main block, a Holley carburetor, and a larger mechanical camshaft. In 1971, the CJ engine also used a 4-bolt main block. However, these engines were actually underrated and produce power in the 440 to 460 hp range. This was done to deceive insurance companies (common practice in that era), so that buyers did not have to pay higher insurance rates.

 

Ford started this stuff back with the 428CJ and SCJ. The advertized hp was 335@5200. But the automatic equiped cars shifted in Drive at 6000 and the motors produce 425 to 435 hp at that 6000 rpm. GM did the same type of thing.

 

I beleive those numbers for the 429CJ, and SCJ are too high, I don't remember what the actual dyno numbers were (I have read where someone did dyno tests on them) but they were more like 390 and 420 something like that I know it wasn't over 1hp per cid.

 

I kinda have to agree with you, as I never had a 429CJ or SCJ beat my 428CJ. Weren't they mainly to make their NASCAR motors legal?

 

Anybody got any info on what a '89 factory propane version 429 truck engine would have been rated at (wondering about hp and torque----and what rpm max torque would be).

Engine is in '89 F-700. Its got plenty of power----not interested in changing anything, just wondering what it would have been rated at. I've got a buddy that's a Ford service manager for the lighter vehicles----he says the factory propane engines normally carried about a 11:1 compression ratio basically to equalize the power of propane up to that of a factory gasoline engine.

Is there an archived site for factory engine spec's anywhere. This old booger has lots of power (and likes lots of gas).

Delta Dirt
Avon, Ms 38723