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Old 02-07-2012, 10:02 AM
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1971BB427 1971BB427 is offline
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The 4-7 swap is what some racers in the 60's changed to in an effort to smooth up the engine and get a litle higher rpm's. It involves having a cam ground to this configuration, or buying one. (they are available)
The 4-7 swap is in my opinion a lot of work and money for very small gains, and not worth the time and money.