gsx-r 1052 engine - head surface

[Framotors]

Hi guys, greetings from Italy.

I'm refurbishing a GSX-R 1100 H engine I got for free years ago. The previous owner told me it was used for track days and tuned up a bit, but it looks completely stock to me.

I have a doubt anyway: the head plain is very low around cylinder 4-intake side (at the same level of head cooling fin) while the other side is higher, about 1,5mm more. Is it normal or is it the result of a bad machining work?

 

Low side, same level of fin

 

Opposite side, much higher

Thank you

[denisd]

Don't look right to me, maybe there is a reason you got it for free! 

[Buzuki]

IMHO what is most important is that all four compression chambers have the same volume , so make simple test by pouring some diesel fuel or motor oil with calibrated syringe in all four comp.chamber , than notice and compare compression chambers volumes , if all four comp. chamber have the same volume than that cylinder head is OK .

[wraith]

Looking at that head, don't think I'd use it.

[coombehouse]

I'd measure it to be sure. Put it face down on a flat surface & a straight edge across the the cam cover surface. Measure from the straight edge down to the surface at each end with a steel rule. It will give an idea where you are.

Edited October 28, 2022 by coombehouse

[george 1100]

You would need to check valve to piston clearance also

[Framotors]

11 hours ago, denisd said:

Don't look right to me, maybe there is a reason you got it for free! 

I guess you're right

[Framotors]

Thank you all, I guess it's time to take some measurements and decide how to proceed.

There's also a couple of dents which makes me worry.

I have another engine with lower mileage I was not willing to use cause painted blue, i think to remove its head and compare

[george 1100]

That dent would need welding and then resurfacing....again

[Gixer1460]

Its certainly not right! The 'dent' looks like someone attacked it with a hammer and nail! Looking at the surface there is little evidence that its been surface ground or face milled, so bearing in mind the potential deck height difference, I'd hazard a guess that someone tried DIY surfacing with emery paper and a sheet of glass, leaned on one side too heavily without swapping ends!