A friend of mine wants the exaust ports on cylinder head he has opened up, I was looking at it and if I had a few specs I know I could easily do it for him.
Do any of you guys know where I could get this info.
It's a 1978 pontiac 400 cu. in. He wants to put custom headers on it and open up the ports. He told me that a milimeter (.039") can increase HP on that motor by 25-30%.
I would love to do it for him and I could easily do it in half a day or less.