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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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castings, cylinder, heads

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  #1  
Old 5th September 2018
ChivaKnievel ChivaKnievel is offline
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Default Early Heads + Cylinder Castings

Hey there, I've been lurking the forum ever since I got my first Ironhead however long ago and first would just like to thank everyone here for all the invaluable information I've found over the years.

Onto the topic at hand, I just picked up a big lot of Ironhead top end stuff and am currently going through the (slow) process of cataloguing it all.



Most of it has been pretty straightforward, but even after searching through every sticky thread here and elsewhere as well as the sporsterpedia page I'm still left with a couple unresolved questions.

First is this rear cylinder, which based on the tag would of course date to October 15, 1966.



The large rounded triangle next to the month designation I cannot find any information on however. Does this have any significance? Or is it just some oddity from the casting company these were outsourced to?

My second question is about a pair of 900c heads. Of the other examples I have the rest have the same protruding boss for the rear set of head bolts seen in the first picture. One pair however has a much shorter, almost flush boss as you can see in the second picture. Does this correspond to a certain year range? (All of the heads have the standard 16683-57 casting no.)



Thanks in advance for your help, and if I run into any other peculiarities I'll be sure to share some pictures.
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  #2  
Old 5th September 2018
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In the two cylinder head pics it is the spark plug area that differentiates them. From the pic it looks like the second head has a raised boss for the spark plug which I think would make it an XLR or iron XR head.
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Old 5th September 2018
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you might want to chat up the guys on the k model site about the cylinder. they deal with up to 1969 and have documted some of the smallest details you can imagine.

as yoshi said the 2nd head pic looks like an xlr head ( totally useless ill gladly take it off your hands ) id bet the bolt surface is just a variation in the casting but just for the sake of knowledge ill see if my xlr set is like that this weekend. i think one of dr dicks sets is on the shelf next to mine if it is thatll give 3 sets to compair.
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  #4  
Old 5th September 2018
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The "rounded triangle" is the forge's casting mark. Yours is just very rubbed out, usually they are sharper. You'll find that casting mark on most hd cylinders from the 30s to the 70s.

I'm not sure on the heads.

As 8 Ball notes, much of the deep knowledge that had been here has moved to the k model site. It's more of a nut and bolt resto forum, but it seems that is what you are trying to figure out.

Just keep in mind you can still buy brand new, quality repo cylinders for $50 set from BMI karts until they finally run out of sets. In fact, I think I'll go buy another set right now ;-)

Last edited by Chuckthebeatertruck; 5th September 2018 at 13:30.. Reason: BMI
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Old 5th September 2018
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Thanks for the info guys, I'm not sure how the spark plug boss wasn't more obvious to me than the head bolts, haha. I couldn't find any other good shots of XLR heads online to compare to other than an old Hunting Harleys video where he happened to mention them, so I thought'd I'd upload some shots of these for everyone else to reference.
















I suppose from here I'll give these things an electrolysis bath and see if I want to have them rebuilt.
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  #6  
Old 5th September 2018
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you should have looked on the forum here.these are mine IMG_0056 by Bruce Stoudt, on Flickr the bolt holes have been relocated for 1000 c.c. cylinders,so that won't match yours.
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chiva- yours were also drilled for external oil drains

im tellin ya total junk send em here, ill throw em in the lake for ya
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Old 6th September 2018
ChivaKnievel ChivaKnievel is offline
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Quote:
Originally Posted by brucstoudt View Post
you should have looked on the forum here.these are mine IMG_0056 by Bruce Stoudt, on Flickr the bolt holes have been relocated for 1000 c.c. cylinders,so that won't match yours.
Oh wow, those look nice. I've got a 73' I'm buttoning up for my brother, maybe I'll end up doing something like this...

Quote:
Originally Posted by 8ball View Post
chiva- yours were also drilled for external oil drains

im tellin ya total junk send em here, ill throw em in the lake for ya
Huh, I was wondering what those "repairs" were. These things just keep on getting more and more interesting.
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  #9  
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The rounded triangle is from the MOCASCO foundry, in Milwaukee... Normally has a intertwined "MC" inside it...

see here:

https://www.jockeyjournal.com/forum/...ad.php?t=91759

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Old 6th September 2018
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Chiva,all the machine and port work was done by forum member mrmom9r.here's a link to part #2 of my thread http://xlforum.net/forums/showthread.php?t=2069695
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