Discussion Starter · #1 ·
I just recently rebuilt my engine. It is a 383 small block. It has a comp XE274 flat tappet cam. After initial break in I noticed a slight tick or knock. It sounded most noticeable from the fuel pump. When you removed the pump you could not hear it. I put on a new pump. Tick was still there. I dont believe it is from a crank or rod bearing as I have good oil pressure and my specs during assembly are all good. The tick seems to be with every revolution of the cam. Today I pulled the valve covers to watch the valvetrain operation. I marked all the pushrods. One does not appear to be rotating. A few are slow like a full revolution is about every 25 seconds. I would imagine that the one pushrod that is not rotating means the lifter is also not rotating? The rest rotate at a good pace and rotate consistently. The one slow rotater happens to be closest to the fuel pump eccentric on the cam. Would this tick go down the fuel pump pushrod to the pump and make the noise greater? I have driven the vehicle about 200 miles so far and it runs great and strong but this noise cant be good so I am back to not driving it. What are your recommendations at this point?