like the title says would thier be any advantages of changing the 706heads for the 317s? cause i got a friend whose sellin his heads and well i was just thinkin would this work...
2005 silverado 5.3 aem intake, long tube headers, no cats, corsa exhaust , custom dynotune, blown head gaskets.. and soon to be cammed

 

on a 5.3 it is going to lower compression, not good for NA power, good for a boosted engine