HVH CARB SPACER
Dave:
Try the HVH 1" spacer right side up - then upside down after you have a baseline on the first application, then try the second.
Yup! I have seen more power (5 hp & more torque) on some applications by just making this one change on an engine dyno. I know, it sounds strange and I can only speculate as to why it occurs. But, it happens on occasion, so give both a try.
The advice by the rest of the guys is very good. It all comes down to trial and error, but the 1" is a very good start and generally more effective than the 2". But guess what? The 2" may be better, you just have to give them a try, either right side up or upside down.
If none of them help you - try some shear plates. Comp Cams has some good cheap ones that may help you. Don't forget the fuel and timing changes when using all the combinations to make maximum power. Signal changes to the carburetor may require some more fuel and timing with every spacer or shear plate change.
Good Luck.