Originally Posted by JEFF69Z28
Originally Posted by fast75vega
Originally Posted by billyd21970
what does it help to have a 4/7 swap on the cam?
it helps the motor breath better and free's up some ponies....... about 30 of them on average :wink:
i think the 4/7 swap has something to do with helping harmonic vibration
it allows the exhaust to flow better and moves the hot spot as well.... which frees up horse power
here is a good 5 page write up in hot rod as they explained it all and tested it...... very good read
http://www.hotrod.com/techfaq/113_07...ams/index.html