well thats cool, the truck came with a set of corvette ram horn exhaust manifolds on it (65-67 327 300hp-350hp). are those the ones your talking about? so i got another question- im looking at the numbers on summit; if the duration numbers are at an advertised lift of .50 but im going with a smaller lift (say .490) does that make the durations shorter? and if so, is there a formula i can use to figure out what the actual durations are with different lifts?
