SunshinePerformance

Hey guys got a good one for you! 402 has 6000 miles and every 126 miles it uses about a quart of oil. What could it be? This is what I know my leak down test said that it leaks about 5% across the cylinders, not bad. I still run the factory PCV system, could that be the problem? The head have been checked out twice and nothing found. Any input?

jermzz

iTrader: (18)

My friend had the same problem. When we pulled the valve covers for the rockers when we did his cam, we found a nice size hole in the intake runner of his Patriot stage 2 heads. Obviously caused from overporting. Maybe you have the same problem seeing as you have the same heads? Some JB weld and a catch can later, oil consumption was about normal. Here's a picture to show what i'm talking about.


Either that or... how many miles are on the motor? Maybe the rings didn't seat.
it's a possibility aswell. Pull your plugs and check them all out. You can tell a world of problems from them.

nahasapeemapetalon

iTrader: (9)

check your rocker bolts and maks sure there is sealant on them, maybe valve seals(exhaust) and maybe some pcv...i plan on putting breathers on...but im sure you have a much more serious prob.

LS1Beginner

Thanks for the thread. I am having a similar problem but oil consumption is a bit less (1qt./500 miles). I setup the catch can but no oil found. Plugs 3 and 5 oil fouled. White smoke on starting (after sitting for a few hours). I had sealed the rockers with white (teflon) thread sealer. The picture is great.
I'll look there next.

SunshinePerformance

Well guys I too checked the rockers and sealed them, I have the catch can mod but it dosent catch to much. The can will pick up about 2-3 oz every oil change not much. The motor has only 6000mi on it so rings?????

LS1Beginner

Sunshine:

I have heard that one can tell rings by decellerating down a long hill from about 50mph. I just took mine out and tried it (from about 75 in 3rd), but no visible smoke out the rear. I also have oil on plug threads up to the seat but absolutely no oil leaks from valve covers etc.. I am going to inspect the heads next for cracks or holes like the picture. Maybe I used the wrong sealant on the threads.

As an aside, after a head gasket failure I sent the heads back to Gunner at Patriot at his request. They were disassembled, checked, cleaned etc.. and had a clean bill of health.