what is the best way to get more power out of my in line 6 ? It is a 1948 GMC 228. The motor runs really well but on a slight up grade in 4th gear it will not maintain a constant speed. I am not looking to win any races but I would like to get a little more power out of the engine. I am looking into a set of Fenton headers and adding a 2 1/2 inch exhaust. Anything eilse you guys recomend?
Thanks.
