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Firewall Data Plates

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Two data plates are affixed to the passenger-side firewall on both the CJ-2A and -3A (arrow), while the CJ-3B has only one, usually on the driver side. A common engine conversion was the F-head four-cylinder from the later CJ-3B and CJ-5 Jeeps, as it was nearly a bolt-in and provided a few extra horses, even though they were both 134ci displacement. The stock F-head carb sat higher on the engine and required a hole to be cut in the hood. But a small Holley carb could be fitted (as shown) with a different air cleaner arrangement that left the classic lines of the flat hood intact.