dookie454

http://www.mediafire.com/download.php?j2un3jddtzj (UPDATED LINK.. this should bring you to the download)

Im attaching an audio file, it plays using Quicktime (doesnt play in my Winamp). I have what sounds like one lifter ticking madly away,
If anybody wants to chime in I'd really appreaciate it. Didnt know where else to post this but saw other Comp Cams 875 posts in here.

There's about 6800miles on a 383 Forged rebuild and about 7psi and 6200rpm rev limited only recently moved up to 9psi. Ticking is getting worse and worse as miles rack up. When I drive this car Im usually always into the throttle at least 2 times out of a trip, so it's beat on everytime I drive it .
It really only does it when warm, and worse at idle than anywhere else though around 2100rpm when oil is nice and hot I can hear it decent inside the car.
Oil pressure is about 30-40psi at idle undess real real hot.
It ticks worse as the oil gets hot.
Sounds like it's near the middle of the d-side bank, so maybe cyl 5? Sounds like it's under the valve cover but seems just as loud from underneath.
It doesnt do it when oil is cold, thought this morning I did hear it before oil pressure built up which is rare... thinking it's getting worse real fast.
Right now it has 5w 40 Rotella Synthetic with about 1500 miles on the oil.
Changing to Trick Flow guideplates did not do one thing
Adjusting rockers when running did not one thing either.
Cam is 230 intake, 234 Exhaust. Lift equates to 0.564" Intake, 0.576" Exhaust using 1.6 ratio CCA-1302-16 Rockers.

I havent had the intake off yet but all the rockers, valves, pushrods look great and it runs perfect, Im worried this ticking could turn into a blown motor if a lifter falls apart and creates a mess.

I dont know what version 875-16's I have as I didnt take a picture but I think I bought them around 2007.

Any helpful advice, should I immediately stop running it?
I think AI reccomended these rockers during the intial build: GM 12371042 Hi-Performance Roller Lifter Kit

Thanks everybody

kylersaulsbury

sounds like a blown header gasket to me, if you've readjusted everything. Get a piece of hose to hold to your ear and just move it around. It will help you isolate the sound.