What is the easiest way to tell a shovelhead from an ironhead? is an ironhead a shovelhead or vise versa? ok two stupid questions but hey I'm trying to learn here!!!

 

A Shovelhead is a big twin that was manufactured from 1966 until the evolution motor came out in 1984. I think it was 1984. An ironhead is a Sportster motor, although I'm not sure if it's still called that.

 

An Ironhead ain't a Shovelhead, and a Shovelhead ain't an Ironhead.

Shovelhead = Big Twin, engine & transmission separate, coupled on the left side by the primary. Pushrods are at different angles, as they share one camshaft. Generator Shovel - 1966 - 1969. Alternator Shovel, aka Cone Shovel - 1970 - 1984, although some early 1985 models may have had Shovel motors.

Ironhead = Sportster, engine & transmission share a common case, aka unit construction. Pushrods are parallel to each other as each has its own cam. 1957 - 1985.

 

Thanks QT Hush and pococj. I'm new to the harley scene and glad I found this place. I hope to learn a lot here...and share as much as I can as well. Thanks again, Al a.k.a. Springer Kid

 

pococj is correct of course , use this simple rule from far away, if the chain/belt is on the left (viewed from the rear) it`s a big twin. If it`s on the right it`s a Sportster. Same rule applies for Flatheads, left is 74 or 80 cid, right is a 45. 45`s morphed into K models (unit construction flatties of 45 and 55 cid)and K`s turned into Sportsters with the adoption of overhead valves. ALL V`s U`s W`s K`s and XL`s have 4 cams, one for each valve.

 

Hmm didn't know that about the Flats... Thanx Hoze.

 

Springer Kid...there are no stupid questions, just foolish people who don't ask (when they should) and end up screwing up or who try to impress others with their lack of knowledge.

 

I asked a similar question a week or two ago. Look under classics (same place as you posted your question) and click on "engine history question". I got some great info there.

 

Does a magneg stick to the cylinder head?

 

Shovelhead

https://www.mortonsdirect.co.uk/mslm...Shovelhead.jpg

Ironhead

https://2.bp.blogspot.com/-fVgLHFL-0.../s1600/XLH.JPG