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NOS Cylinder head identification #75381 06/16/08 5:26 pm
Joined: Jul 2006
Posts: 12
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DCotton Offline OP
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Here is the short version of a long story. I opened a box in my shop that has been there for 36 years.
[Linked Image]

Inside is a NOS Norton 750 head complete with original invoice from Norton Villiers to Suzuki of Oregon City (my folks, Suzuki, Kawasaki and Norton dealers in the 1960ís and 1970ís). The invoice is for part number 060988, cylinder head, $160.00 dated 1/12/1972. Thatís the correct part number and price for a stock head (I still have the parts and price books).

[Linked Image]

Here comes the twist. The original packaging inside is labeled Plumstead cylinder head, no. 8, F/S 180.
[Linked Image]

If I remember correctly this was a combat head that Norton provided to those of us on the AMA circuit. There is no casting/part number on the head, you can faintly see the BYRCO logo.
[Linked Image]

It looks almost identical to a stock head except the relief for the push rods is machined away from the valve instead of towards it.
[Linked Image]

Any help in identification from you Norton experts would be appreciated.

Thanks
Darrel


Darrel Cotton
Bend Oregon
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Re: NOS Cylinder head identification #75382 06/16/08 5:58 pm
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Dave Comeau Offline
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06-0988 should be a std RH1, 28.5mm ports, with guides installed.

http://atlanticgreen.com/images/cylhead.jpg

or
http://atlanticgreen.com/nhth.htm


dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
Re: NOS Cylinder head identification #75383 06/16/08 6:02 pm
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Ron Leisner Offline
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Part number 060988 is for the 1972 non-Combat (low compression) head. I take it the last picture is of a Combat head for comparison, evidenced by the milling machine marks on three "nubs" and the shallower recess.

Is it an illusion or are the valve seats larger (larger valves) in the subject head? Were the ports reworked?


Ron L
1973 MkV 750 Roadster
1974 850 Interstate
1975 850 Cafe Racer
1968 750 Fastback
1967 P11
1969 Ranger 750
Re: NOS Cylinder head identification #75384 06/16/08 6:18 pm
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DCotton Offline OP
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Dave, Thanks for the quick response. I had already been to both of those sites. In fact the last picture is from the second site and shows the difference in the puch rod cut outs. My head has push rod reliefs cut towards the outside of the head while the 060988 stock head photo is relief cut towards the combustion chamber.


Darrel Cotton
Bend Oregon
Re: NOS Cylinder head identification #75385 06/16/08 6:44 pm
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DCotton Offline OP
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Ron, Good eye the subject head (new head) has been reworked. We used to install a larger exhaust valve/seat (from a Chrysler hemi), it is a little bigger and the head is flat instead of concaved (gained a little compression), installed bronzed wall guides and cleaned up the exhaust port. This was a spare head for my flat tracker/TT bike that never got to see fame and fortune (or bend, break and pound itself to death). You might find this interesting. Here is a hand written invoice for the machine work on this head and another Norton engine. These prices are right up there with the $0.15 hamburger.
[Linked Image]

Darrel


Darrel Cotton
Bend Oregon

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