1jz cam clearance issue.

[kelson]

Ok, so a little history: my 1jz head was warped so I decided instead of getting it resurfaced I would buy a new head from a club lexus member, because it was ported, +1mm ferrea valves....ect.

So today I got the ferrea valves put in with the stock springs and retainers (I'll upgrade those later. I'm not planning on reving the crap out of it yet.) so I transfered the buckets from the intake side of my old head to the corresponding places on the new head. I have never done the shims before, but it didn't seem hard so I put in the camshaft. When I went to check the clearance I realized the cam was holding all the valves .5~1mm open! when they should be completely closed. so I put the smallest shims I had on and repeat. same problem. so just for kicks and giggles I moved the buckets back to the original head and the clearance was right on. so now I'm just really confused. I check the specs on the ferrea valves and they are the same overall length as stock. am I missing something here? someone help.

P.S. I also checked with no shims in the buckets and there was a lot of clearance so how small of shims are available?

 

[kelson]

bump. Ideas? anyone?

 

[Bigzavs]

im not sure exactly, but the stem on the ferreas might be longer or shorter, cant remember. you might need to pull a valve and compare against a stock one. if it is longer you can either get a smaller shim, or have the top of the valve stems cut down

 

[hvyman]

when you do a valve job you have to cut the tops of the valves since material was taken off the head.

 

[kelson]

when you do a valve job you have to cut the tops of the valves since material was taken off the head.

ah! I see that makes sense. so do I have to get a machine shop to do that?

 

[hvyman]

Usually if you want it precise. That is also part of a valve job. Idk why it wasnt done if the guy got new valve's.

 

[kelson]

Usually if you want it precise. That is also part of a valve job. Idk why it wasnt done if the guy got new valve's.

ok thanks. it does seem a little odd but the head was never installed so I guess thats why. it only came with intake valves, I had to order the exhaust myself.