Reply to "Closed Chamber Heads"

George PAdmin.

If your Pantera is still equipped with the original short block then its a 1972 variety Cobra Jet motor (Q code motor). It was originally equipped with a 750 cfm Motorcraft 4300D carburetor, open chamber 4V heads with the large 2.19” intake valves, and 75.4cc combustion chambers (D2ZE castings). The motor was also equipped with flat top cast pistons having two valve reliefs which set the compression ratio at 8.6:1. The hydraulic cobra jet cam lifted the intake valves 0.481”. It was rated for 266 net horsepower, but the same motor was rated at 280 gross horsepower the year before.

3/19/1311:28 PM

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