Im stumped, It's missing and ticking.

No headders, I checked for exhaust leaks and found nothing, the fuel pump eccentric wasn't new when installed but was cleanned and in good condition...something to look into but im dreadding pulling the front of the morot apart. Im going to pull off the valvecovers today after work. This sucks Im driving a Mazda to work, I hope you guys wont think any less of me lol.