I had someone tell me their 1000cc was bored to make it a 1200cc Ironhead. They fullashit?

 

They probably are.
But then, it could be 1200cc if the engine has been bored and stroked. Stroking it is the only way to get that size displacement.
pg

 

Yeah, that's kinda what I thought. To get 1200cc's not only would you have to bore and stoke it but I think also would have to alter or even change the stock heads completely.

 

You use the same heads with strokers, they are just machined for the new cylinders, at least that is true for my 1970 XLCH ( from 883cc to 1257cc)

 

I'm not real knowledgeable regarding boring or stoking motors. I wouldn't think you would be able to "stroke" a stock 883 any significant amount? Even with grinding/machining really dont look like there's much room to work with.. How much longer over stock are the rods ur running? How much overbore cylinders/pistons? Did you have to swap out or make any modifications to the cam?


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Just thought of another questions! Say I take my 1000cc and bore it out .60 over. What cc would the motor now =? 1200cc? Can you tell me how I would calculate that? Last question is if you knew how many cc's "max" (while still maintaining resonable structural integrity) is possible to attain from a stock 75' 1000cc motor PRIOR to any head modification?

 

hey gunnut1 - getting ready to tear down my 70 XLCH and i'm looking to stroke and bore it - could you offer any suggestions, potential parts lists, ideas, etc.? would greatly appreciate any input you might have to offer!!

 

I cannot help with the technical details. Not to rain on your parade, but you should be aware of some things ...

Boring an IronHead engine is never done to increase engine size; it is done only to repair worn cylinders. The cylinder sleeves are too thin to produce any significant power gains from overboring.

Most 1000cc engines can be overbored by .010, .020, ..., .070 after which you need to replace the cylinders with new or re-sleeve them. Some guys say that the .070 is too thin.

The early 1000cc engines can be overbored only to .030. I believe 1970 is in this category. With some machine shop work you can install a later top end.

Stroking can be done. It will cost a lot of money and requires significant knowledge and experience. It is not a simple matter of replacing parts. The needed parts will be difficult to find. The cases have to be machined to accept the new parts. You will have to beef up the transmission. Etc etc etc.

And when it is done the engine life will be reduced.

Others can help with the needed tech info.

 

Thanks Mick - I have done some research and am aware of the fact that doing this will shorten the life of the engine. We have a machinist friend with the know-how for doing the necessary work on the cases, etc.. etc. I have been trying to gather as much information as possible on both the pro's and con's of doing this. Appreciate your input!! Will post pics when we get done with the 70 whether or not it is decided to be bored and/or stroked.

 

May be some helpful info here, plus a few other guys running strokers ...

S&S FlyWheel & Stroker Information