Hey guys , my son reminded me of a trick we used to use back a long time ago. Just wanted your opinions. Last year I went from a small 1 5/8 to 1 3/4 tube header TTI to a large for the INDY heads W2 big tube headers. The car went almost a 10th slower off the trailer. I jetted the carb up some and got my time back but couldn't help but wonder why such a difference. Anyway fast forward to tonight and my son reminded me of the old header collector extensions we used to put on and mark with a wax pencil to cut at the melt point. How about opinions on weather I should give this a try and do you think it will help ?? I was really hoping that those expensive TTI ILL fitting headers would have made a big improvement in my setup and they never did.
I have a 422 ci X Block with a 652 roller cam and INDY 360-1 heads on it. It runs pretty good but I really thought the headers would have made a pretty good difference.