Originally Posted by
PowerHouse
I have done a lot of testing and also a lot of porting work with these engines and I have found the 9901ss and 41020 header to work the best for low and midrange performance and the 9901ss with the 41021 for more mid to upper end. I also have run it with the JP1, JP3, 007, 053, 2060, 2035 and out of all of those the JP1 and 3 worked the best. I found the 053 tuned section too short and restrictive for the longer stroke. The JP1 and 3 have longer and bigger volume chambers which the longer stroke and/or bigger bore engines need to scavage. The JP1's expansion chamber is about 10mm longer than the 3 which will give it more low end performance. I will be at motorama as well and will have a bunch of pipes and what not with me so come see me if you want to try out a few combinations if the JP3 or 053 isn't working to your liking.
so your saying the jp3 over the 053. once i have some $ i want to get a new pipe. i was thinking about the 9901ss.