Where's the Wow?

1st thing is your expectations are too low. Not only would I expect 13's with a X-head, XE268 cam, good exhaust, but I would expect to pound 13's easily.

You are looking for something major....

• Cam lobe wiped out? you can confirm without taking the intake off
• Timing Chain off a tooth or two? I actually did this once (LOL) by lining up the dots on the key way instead of the timing dots. Ran good, but was slower than a stock 170 six