i ran a 1 inch spacer on both my GT-40 intake and my Victor 5.0. The GT-40 was because I wanted to try and cool the upper a little. It worked good when the car was NA. The intake stayed cool enough that I could put the back of my hand on the intake and not feel like it was being burned. When I put a SC on the motor I no longer noticed a temp difference. I didnt notice a difference in RPM range either.
As for the spacer on my Victor, it was purely for packaging needs, but I know the upper plenum stays pretty cool.
1967 Ranchero, 390, C6, 9 inch rear
New build : 10.5:1 408, AFR 205s, Vic Jr int, QF 750, FPA 1 3/4 LTs, AOD, 3200 stall, 3.70 gears
Last edited by Dart347GT; 04-15-2009 at 09:44 AM.