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Installing a 90's Katana head on a GS1100

The gsxr 1100 cam guide show'ed up today. It's longer than my 750 one and about 1/4 inch shorter than the GS one. Did a test fit and it looks like it's going to work. That was the 2nd show stopper fixed, like should I weld the head for the GS one or try the GSXR one.

Still got to finish up the clean up work I'm doing in the ports then I'll put the valves back in and it's ready to go on.

The final thing left is the 13.5-1 piston fix and clearance check and/or alittle more grinding if required. I should be ready to clay the tops of the pistons by next week.

It's getting closer to see if this head can make the claim 20 hp more than a 1150 head???
 
RacingJake said:
It's getting closer to see if this head can make the claim 20 hp more than a 1150 head???
Click to expand...

Do you have any way to measure the difference in power? You changed so much this winter hard to say how much is due to head.

Oh yea, I still have a home for that old slow clunker head thats now collecting dust, LOL.
 
I'll just be running it down the track and will see.

And as for collecting dust no worry she's in the bag :lol: I think Ryan used his as a door stopper a few years ago
 
I clayed the pistons with the head on and got about 30 thou clearance, waiting for some feedback from the guys on dragbike. I'm thinking I need 50 to 75 thou just to be safe.

I'm not talking about V/P clearance, it's the head/piston clearance I'm worried about???
 
Today I work on the piston's some more and I think they are done. Also drilled some some holes into the manifolds and screwed the nos fogger's in. I like the rubber manifolds no tapping required.

I'll clay the pistons again tomorrow.....got my fingers crossed.
 
How are you reshaping them?

A friend of mine has some of Paul Gast's old prostock parts and they reshaped the piston to get it to fit up in there pretty tight. If you want I can see if he has any numbers.

My old girl has a lot of slop. Nothing can hit the turbo pistons and I would dare to guess that yours makes a lot more power than mine off the line.
 
The only places they were hitting where on the side after alittle work with a file and some sandpaper I have about 50 thous clearance after I clayed the pistons and cranked it over.

h2.jpg


p2.jpg
 
Last edited:
Not yet, I'm still waiting on a 1166 base gasket to show up cause my 1395 gasket was just alittle too big. I'm not using a topend oiler so I need alittle gasket material around the block oil passage between the studs. Other than that I think I got everything cover.

Maybe by next week it should be back in the frame \\:D/
 
Jake, I cannot stress this ENOUGH - GET a topend oiler! I promise, you will have cam & rocker issues if you don't! TRUST me,I had another guy I built one for learn this the hard way. I am NOT kidding, Jake, GET a topend oiler! If you need one I have a brand new one from Ward on my shelf right now. Ray.
 
Never had any topend issues after 1000 runs, but then again i don't run mega cams or spring pressure's either. This year I'm not running bars/box/ 2 step so my out of the hole launches are going to be real soft.
 
Jake, in this case it is an issue with getting oil to the cams with THIS cylinder head! It isn't fed like a GS! Look at where the cam oiling cames from in the valve cover on this head! If you DON'T put an oiler on it, you WILL fry topend parts! I have done ENOUGH of these to know what is needed! Ray.
 
If you need gaskets call cometic gaskets direct. They usually have mine ready in a couple days. When they were a smaller company they used to make them same day.
 
Got the cases bolted together and the base gasket will be here in a few days. So I set the lower end in the frame and used a flat washer to space out my 530 14 tooth sprocket and lined it up with the rear. Only have a 42 tooth on the rear so most likely I'll go through the traps in 3rd gear now.

With alittle luck it might be ready by next Friday's shootout
 
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