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  #1  
Old 17th May 2008
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Default would this top end fit my 72?

just wondering if this would fit my 72' XLCH. he says its from a 77' but i thought those rocker boxes were older. or better yet will rockers like these fit my heads?

http://cgi.ebay.com/ebaymotors/HARLE...QQcmdZViewItem
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  #2  
Old 17th May 2008
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You have to know whether yours is Early or Late 72. Early 72 is 900 CC. Late 72 is 1000 cc but with thinner cylinder liners that can be bored out to only about 40 over. I think there is another major change to newer 1000 cc in 73 or 74.

Others may be able to come in here and be more specific. Basically you have to know what the differences are, which one you have, and what is compatible.

See what is in the compatibility Sticky.
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Old 18th May 2008
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He is advertizing an 77 OEM top end and you're right, those are early rocker boxes.
If the heads are from 72 and the cylinders are from 71 I don't think the cylinders and heads are going to bolt to each other. 71 was still 900.
BUT I don't have a parts manual that lists those parts, so that is all I can tell you.
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Old 18th May 2008
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The numbers are right but a 71 is a 900... something doesn't jive. Ask a lot of questions or you will end up with parts that you won't be able to use. I go to my local shop and have them look the parts up... or use the JP Cat once in awhile. They have some parts numbers in there... but not everything. The 1972-E73 had a different bolt pattern on the heads and cylinders... From 1970 to 1973, AMF did some funny things, there are a few "one of" items for Sportsters...

Jim
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Old 18th May 2008
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what about the rockers? would rockers like that, which are pre 71 900cc i guess, just swap onto my 1000 xlch?
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Yes, the rocker boxes will fit.
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Old 19th May 2008
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As long as your '72 is a 1000cc it should bolt on. The rocker boxes appear correct as they have the later allen head end plugs. Early ones were slotted. As long as the heads and cylinders are matched you don't have to worry about head bolt pattern. All 1000 cylinder base bolt patterns are the same. I've never come across a 900 '72, but its possible a leftover '71 was titled and sold as a '72. You should be able to tell by your VIN # stamped on the left engine case.
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