The part about this engine that has me stumped is the lack of torque down low. This engine is great from about 3,000 to about 4,600rpm. Falls off after 4,600, not so bad because it is only a 2v engine. However, under 3,000 this thing is a dog. I have driven a lot of 2v motors in my days and they usually ahve a healthy low-end punch and then fall off when they get up there.

I read things about the headers for this engine and the biggest improvement being in the 2,000 to 3,500rpm range. This is not a product of free flow but usually a product of restriction. The more restriction the more torque you make, remove the restriction and torque usually goes in favor of hp. In other words it moves the torque curve up in the rpm band.

I would be happy with 150 hp and no breathing above 5,000rpm if I had a wider torque curve.

I think that I may need to introduce a little more swirl in my intake. How?