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Identify Head

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Post Sun Feb 24, 2008 10:04 pm
Pa Site Admin

Posts: 5801
Location: Ohio USA

Casting number on the bottom, #16684-52. Has a letter "E" within a circle on the bottom of it as well. Thanks, Pa

Post Mon Feb 25, 2008 10:55 pm
Pa Site Admin

Posts: 5801
Location: Ohio USA

Thought I would have gathered some info on this K head by now. My parts books don't provide any info on the casting number and my memory doesn't serve me well, not even from the two KHK's I owned in the past. Pa

Post Tue Feb 26, 2008 7:40 am

Posts: 217
Location: Palo Alto, CA
Hi Pa, I believe these are just later model K/KH heads (maybe from 54 or so onwards once the casting had been finalised?), and standard castings. I wondered for a while whether this casting number indicated KK/KHK relieved heads as I have seen some NOS heads with non-standard relief work (and see in the parts books that heads were part of the performance package), but haven't seen enough close enough to substantiate this and doubt it. Harley casting numbers aren't always part numbers as we know and this number isn't in any book I've seen for K/KKs, KH/KHKs, or KRs. How do your heads look?
I'm sure Patrick, Mike, Beachdog or the others who have seen more of these bikes might be able to shed more light on it for you when they have the chance!

Post Tue Feb 26, 2008 4:14 pm
Pa Site Admin

Posts: 5801
Location: Ohio USA

Appreciate the reply Bro. I only have the one head. It really belongs to my Ole Lady and I haven't a clue what her plans are for it. The chamber is in mint condition with no cracks or signs of repair but someone ground some of the forward fin stock, between the fins, away. I assume they did this for better airflow. I post a pic of this head in the near future. Pa

Post Tue Feb 26, 2008 6:02 pm
Pa Site Admin

Posts: 5801
Location: Ohio USA

Here are a few pics. All I really know about it is it's a rear. I did find an inperfection after closer observation in the chamber area. Between the valve areas, against the chamber wall, is, what looks to be a casting flaw. If it is a crack, the cylinder mating surface doesn't agree. It is super flat. Pa

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Post Wed Feb 27, 2008 11:06 am

Posts: 2687
Location: Los Angeles, CA
That is the Hallmark of the company that cast them.

Post Wed Feb 27, 2008 6:44 pm
Pa Site Admin

Posts: 5801
Location: Ohio USA

The E in the circle or the number....or both...Chris ? Pa

Post Wed Feb 27, 2008 11:21 pm

Posts: 2687
Location: Los Angeles, CA
Pa wrote:
The E in the circle or the number....or both...Chris ? Pa



The number is the casting number. Casting numbers are NOT part numbers and will not be found in parts books. The Circle E is the foundries hallmark.

Post Thu Feb 28, 2008 6:15 am

Posts: 217
Location: Palo Alto, CA
So there's not some Circle E Ranch owner down in Texas who's hoarding these things? ;-)

Post Thu Feb 28, 2008 11:30 am

Posts: 2687
Location: Los Angeles, CA
suicideshovel65 wrote:
So there's not some Circle E Ranch owner down in Texas who's hoarding these things? ;-)

Yes, That rancher owns the foundry too. :mrgreen:

Post Thu Feb 28, 2008 3:19 pm

Posts: 587
Location: Crewe, Great Britain

Hi all, Hi Pa,

Yes, std K/KH casting. As cast combustion chamber. KK and KHK heads were milled deeper for clearance needed due to the higher lift cams

The cracks were another well kept secret from the factory... Everybody knows ALL the K gearbox must've exploded at some stage, but nodoby ever had a bad word to say about the heads, which mistify me as their propency to crack is second to none...

Due to the sharp transition edges between vertical walls and top around the valve area. I blame the double deck fin as well which probably induced unsufferable stresses when the engine stops and cooling occurs...

You've never seen a KR head cracked cause these sharp edges were relieved for more flow and lots of race guys in the 60's milled away the double decker fin!!!

Patrick

Post Thu Feb 28, 2008 3:35 pm
Pa Site Admin

Posts: 5801
Location: Ohio USA

Thank you Patrick. Pa

Post Mon Mar 17, 2008 5:55 pm
jib

Posts: 575
Location: devon,england
of subject slightly but as these heads were copied from the bmw sidevalve via the XA does anyone know wether those had problems with cracking? regards jib
Dude, check out that jibhead, he's crazy. Hasn't been sober for 40 years

Post Mon Mar 17, 2008 8:37 pm
Pa Site Admin

Posts: 5801
Location: Ohio USA

Speaking from assumption only, I suspect the increased compression ratio and cubic displacement had plenty to do with the cracking. Pa


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