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Message: [QUOTE="Powerstroke Cowboy, post: 377730, member: 610"] OK heres the deal... I jumped in the pickup and was on my way out to the hay feild.(15 miles away) It started up great and ran great... About 4.5 miles down the road it started to nock BAD!!! It sounded really bad!! I was driving along @ 45 to 50 mph @ about 1250 to 1300 RPMs.. AND i had not tookit above 1600 RPMs the hole time.. Right now as i sit I have put on about 160 trouble free miles since I got it up and going...Except for the fact the clutch slipped.... And then out of the blue it starts to nock so Ipushed in the clutch and @ a Idle it does not do it BUT as soon as I hit about 1100 to 1200 RPMs it starts to nock??!??!! So I shut it off... Then started it back to see if ot smoked just sitting there @ a idle.. No smoke.. not even a light haze.. So i rev it to 1200 rpms No smoke... Just a bad nock... So i got turned around and drove it home between 800 to 1000 rpms....(did not nock there) The nock has got a lot more quit now... I that point i was lost to what was wrong.. So i run a couple of tests.. Here is what I got.... P0263 Cylinder 1 Contribution/Balance Fault P0272 Cylinder 4 Contribution/Balance Fault P0275 Cylinder 5 Contribution/Balance Fault I really do not think this^^^^^ should make it nock... With the hood up standing in front of the pickup you cant hear it intill you get to the back of the engine.... To be honest my first thoughts were one of the SB push rods bent.... OR a keeprer on a spring poped off.... But the later could not have happened.. And normally if a PR bends.. They smoke like a fright train!!! Then i thougt mybe a VC harness is was bad... BUT it passed the buzz test... any thought???? They would be great!!! one more thing... it still start great!!!! [/QUOTE]