Hey all, recently bought an evo 9, had some issues , pulled the head and had it redone. I bolted the head on and did a leakdown and getting 50% leakdown on #1 cylinder and 15% on the rest (fresh rings/hone 0 run time) when I spray some kerosene in the exhaust ports it shoots back out, intake also. The head guy tells me that he's confident it will seal up with a little run time, what do you think? Also, would that be responsible for the majority of my leakage? Should I just fire it up and do a leakdown after everything breaks in?Thanks.

 

I would say if there isn't any run time I would at least seat the rings and then redo the leakdown test being he is right if the rings haven't seated all the way they there can be some issues there right off the bat. I would start it up a few times, let it warm up to operating temp and then redo the test and see what comes out of it.

 

What lifters do you have?

I had an issue with GSC zero tick lifter causing my valves to hang open.

 

The cams are off right now

 

I have zero tick lifters as well. You have to stick a paperclip in and collapse the lifter before you put the rocker back on or it will hang up like your experiencing. It says so right in the directions.

 

I had the lifters out 4 times. Put oem lifters back in and issue disappeared.


Call gsc and have them give you the measurement that they require from where the valve sits to the tip of the valve. On my head it was way to much which made the valves hang open after machine shop did a valve job. I put oem lifters back in and it worked.

 

What lifters do you have?
Oem or gsc?

 

Also google gsc zero tick lifter issues and you'll see that I'm not the only one.

 

Oem lifters

 

You got any numbers on this? i have these gsc zero ticks and just did valve job, couple valves sit right on the edge of oem spec

 

nah the valves shouldn't be leaking. If the valve seats where machined and lapped properly there should be no leak i smell some bull****. Guys if the cams are off all valves should be fully seated, regardless of lash adjusters... you can put a little bit of engine oil into the cylinder and redo the leakdown test, if numbers improve its the ring seals, if not its the valves.

 

Why the hell are you doing a leak down test on a fresh engine with zero run time? You're wasting your time. Put it together and run it.

 

 

Interesting i have never heard that before. Hmm learn something new everyday.

 

Yeah I agree get some heat cycles in it.

Yeah it shouldn't hurt anything as long as your not being stupid about it.