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https://www.carmemories.com/ford-engine-specifications/ford-427-428-429-specs/

Confirmed here for anyone else looking.

"The Super Cobra Jet, available only with a 3.91 or 4.30 rear axle ratio, included additional features. For improved high speed reliability, the SCJ used the beefier LeMans style capscrew connecting rods and forged pistons. This heavier reciprocating assembly required additional balance mass on the crankshaft added via a special front oil seal sleeve with a cast-on counterweight. An engine oil cooler forced the horns to both be located on one side of the car. A reinforcement plate was used for the horn bolts behind the radiator core support -- often lost, or missing from fakes. Air conditioning was not available because the oil cooler used up the space in front of the radiator. The SCJ engines used 427 Le Mans style rods with capscrews and forged pistons. "
That is more not-all-correct information..

First off, the entire paragraph is referring to the 1969-1970 FE-series 428SCJ. Which was zero relationship to the 1971 385-series 429SCJ.

Secondly, the lack of available air conditioning had ZERO to do with the placement of the oil cooler, and 100% to do with the gear ratio. Not just Ford, but all of the major manufacturers, only offered lower gear ratios (usually nothing at or exceeding 3.50) on air-conditioning-equipped cars because of the higher maintained RPM's that would be realized at highway/cruising speeds. A/C systems back then were not designed to sustain higher RPM's, especially the compressors.

Be careful of what you find on the internet.. The internet is one-half an incredible source of information, and one-half an incredible source for pure B.S., all dumped into a big bag and "shook-up".. LOL.. ;)
 

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There were two 429 options for 71, the C-code CJ (Cobra Jet) & J-code CJ-R (Cobra Jet - Ram Air). Adding the optional "Drag Pak" 3.91 Traction Lok (V) or 4.11 Detroit Locker (Y) rear gears turned either 429 into a "Super Cobra Jet", with solid lifter cam, Holley 780cfm carb and special rotating assembly with forged pistons.

As has been noted, A/C mandated a 3.25 rear gear.
 
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