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Ok when I bought my 67 XR7 it had a 2V set up on it. Which it still has. My vin says it is supposed to be an A code 4V engine. Question is, is there any other difference in the engine of a 2V and 4V other than the intake manifold and the Carb? I want to get it back to a 4V setup. Is there anything I need to change bedsides the intake and the carb? And how can I tell if the engine is the original 4V that came with the car? Or did they change the entire engine to the 2V it is now?:eek7:
 

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The 1967 289-4V engine had a different set of cylinder heads than the 2V version for higher compression, so the 4V engines needed 98 octane leaded premium fuel. Otherwise, the intake and carb are the only difference. The 4V engine also had the same single exhaust system originally, with the same exhaust manifolds.

Just change the intake and carb.
 
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