It would not be a bad idea to have some heli coil or time serts in the right thread sizes on hand. You could always return them, and would hopefully be able to.

 

 

you'll have to measure your own, but compared to the exhaust manifold gaskets both the head exhaust ports and manifold ports were restrictive on mine. Like, by mm's.

I have the H180 cam so the head is breathing a bit more than stock. It made a difference enlargening them. I cannot speak to the stock cam.

 

Update: got down to the heads, trying to figure out how to get these sai pipes off, only thing that stopped me from pulling the heads yesterday.

 

 

replacing the valve stem seals should be a no-brainer. it's such a simple job. even if you have your heads sent out to be skimmed/tested etc., you can still do it yourself after you get them back rather than pay an exorbitant amount to have someone else do it.

as for the sai pipes, i was able to get one of the injectors loose on each side without distorting the pipe, enough so that i could unscrew that injector. after one injector is out, the other one can be loosened safely without worrying about pipe damage.

 

Ok I got the heads off, took them to a machine shop and I am cleaning everything in the meantime. I have a lot of tiny gaskets and stuff in which I honestly have no idea where they go but no worries.... I at least know where the major stuff goes.

 

My HG kit from L8 had a ton of extra bits