973800CamaroRS

iTrader: (3)

Been battling this issue to no avail, I am constantly getting oil on my spark plugs threads and on number 2 cylinder will foul out the plug to where it wont even fire. I am running a prc 260 ls3 head and I have rtv the rocker bolt holes. I have no idea where the oil is coming from. Didn't have this issue until these heads ? Any advise. The motor does use oil but does not leak, going to do a leak down test this weekend. After an hour driving all the plugs are burning good except one and all have oil on the threads.

G Atsma

Valve seals/guides....

973800CamaroRS

iTrader: (3)

The heads have less than 5,000 miles but I have noticed this problem since day 1.

G Atsma

Make sure the valve seals were correctly installed. Even new they will fail if not done correctly.

973800CamaroRS

iTrader: (3)

Would of been straight from tsp, but I will check. Will a leak down test help confirm this ?

G Atsma

Probably not if the valves seal well.

RockinWs6

It would have to be more than just a valve seal to foul a plug.

miami993c297

iTrader: (6)

First item to check, it was the issue on my engine after new valve seals installed, 3 did pop-up

973800CamaroRS

iTrader: (3)

Going to check this weekend all plugs have wet threads however only cylinder two will foul out

973800CamaroRS

iTrader: (3)

Little update.... replaced valve seals but the issue is still there. Compression on all cylinder is within 10psi. I'm kind of lost as to what could be doing this just to one cylinder.

RockinWs6

Well without scoping the cylinders I can suggest a few things. 1st would be carbon pasted rings, second broken rings or ring lands. Like I said above noway valves seals would cause a oil fouled plug. When number 7 in one of my LS1 cars was fouled the piston was broken. I'd rent or buy a cheap camera scope and take a peek.

973800CamaroRS

iTrader: (3)

Was compression ok ?

WSLN 6

iTrader: (3)

Leak down test could tell you more I would think...

RockinWs6

Yes it was....real pain in the azz.

01CamaroSSTx

iTrader: (3)

I was running into the same issues with my build. New build with PRC 265cc heads and kept oiling down the back cylinders and burning oil out the tail pipes once you reached operating temp. Been told to put sealant on rocker bolts that wasn't it. Guides, seals, rings all culprits but after checking compression and leak down tests it turns out I was just getting way too much oil into the intake so my question to you is how is your PCV system setup

RockinWs6

He is having a issue with no 2 cylinder, I seriously doubt its pcv related.

973800CamaroRS

iTrader: (3)

I run a catch can so that wasn't my issue it ended up being a cracked piston. Not sure how I cracked a wiseco forged piston but I am going to pull it apart and see.

RockinWs6

Bunch of things can crack um but the most likely culprit is not enough ring end gap. Ring expands and has to go someplace, ends up cracking the piston. I'd probably check the injector and inspect the intake seal in that area. Cylinder may have been running on the lean side. Also check the rod bearing for signs of detonation.Good Luck

973800CamaroRS

iTrader: (3)

Appears there is a small circle and the cracks proceed from that. not sure if something hit the piston.

white01ss

iTrader: (37)

Maybe the piston is contacting the head? What's your piston-to-head clearance? Also, piston-to-valve clearance?