01-19-2015, 05:36 AM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,533
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According to The Great FE Intake Comparo book by Jay Brown, the Blue Thunder is a little taller. He measured height by placing a straightedge on the carb base extending over the front and rear of the intake. Then he measured the height of the straightedge at the front and rear lines of the intake. Both measured 4.875 inch at the front. The RPM measured 6 inches at the rear and the BT measured 6.75 inches. So the BT is set up for considerably more engine slope when installed. The BT does position the carb 1/2 inch closer to the front which would minimize the difference in height a little.
You might want to see how much engine slope usually results when installed in the Superformance. I think FEs usually end up a little more level in Cobra replicas than in regular Mustangs, Galaxies, Torinos, etc.
It looks like from his charts he got a little more power out of the BT on the higher performance 427 SO combo he tested using a lot of carb. The RPM was a little better on the closer to stock 428 combo he used for a test mule. But - results probably will vary depending on the engine combo.
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