45 Magnum Engine

[45-Brian]

Good 'Day All,

I purchased a set of 45 cases that have been welded, machined and what I thought was ready to go to build a 45 magnum engine, however the cylinder bolt pattern do not match the early sportster cylinders I have. Below is a picture of the bolt hole pattern the was installed.
Can anybody tell which bolt pattern I have?
Disregard the actual gasket pictured as it was only used for illustration purposes, and measurments.
Cylinder base gasket measurements.jpg

Any help would be greatly appreciated.

Thanks Brian

[kitabel]

Doesn't look like 900cc Sportster, the spigot hole is too small (should be 3.25"). The 1000cc is even bigger.
Is that gasket rotated? The 2 pairs of left case studs are 2-7/8" apart from each other (same as a 45, but father to the left on the new metal).
Got a picture of the case deck?

[45-Brian]

Sorry for the delay, but I was away on holidays. Here are the pictures as per your request.

For some reason I cant get them to view the right way???Pic1.jpgPic2.jpgPic3.jpgPic4.jpgPic5.jpg

Also please accept the crudeness of the down & dirty caliper measurments. Hopefully you can make heads or tail of it.


Brian

[kitabel]

Thanks, but doesn't match any Sportster I know of, everything is too small.
This may be for an English single, for more about this and some pictures of a Magnum under construction see my page here: http://victorylibrary.com/tech/enigmas2.htm