[68 TT]

Originally Posted by El Campo

The entire valvetrain is from Comp Cams. I bought the entire matched roller cam, lifters, springs, keepers, timing chain, thrust button that they recommended and they were assembled at Competion Products. I had wondered about the header size too. I will try the new to me Hookers that I just got since I have them and see if I notice any improvement and will keep eyes out for an even bigger set. Would compression make a difference as to necessary header size? Is it an alcohol dragster or gas. If you have really high compression like 14:1 or so then does that make you need bigger headers? I wonder if I could fit big tube headers in to the frame ?

I have had the wrong parts put onto a set of heads by the machine shop before. The guy putting them together after the machine work was done didn't see the note to use the customer supplied parts and just put them together with their typical hydraulic flat tappet cam parts and not the ones I gave them for my roller cam. Just because of my past experience I would like to verify the spring pressures are what they should be for your cam.

There is quite a bit of room for bigger tubes in our trucks. You will most likely need square body clam shell style motor mounts to clear the front tubes but this will open up the use of more headers intended for square bodies that may not be designed for 67-72 mounts.

This pic is of the clearance on my 69 with 1-3/4" tubes and square body motor mounts. Lots of room for more tube size if they are routed right.