SOHC.co.uk Forums > SOHC Singles & Twins
My first project - 1974 CB360 K0
Bryanj:
I agree with Ash thats a casting flash, cam and head in very good condition, if you cant get better rockers they will run as long as you are not racing!
Craizeehair:
Thanks Bryan, I’m really pleased with that.
McCabe-Thiele (Ted):
Yes casting marks can appear very scary when you first find them.
It all does look pretty good.
K2-K6:
My view of the rocker faces, they definitely need attention....Newman cams a good place to have them repaired and reground to specification.
The pitting on them directly wrecks the oil film that's supposed to keep the materials apart (follower and camshaft) with likely a short life thereafter. This is often the result of poor oil condition from servicing and or, dilution of the oil from petrol contamination, short journeys etc.
Generally looks pretty clean and good condition in there.
Agree with casting marks, the method of die-casting has a jigsaw puzzle of moulds to form the shape in which to cast, when opened to get the crankcase out then imperfect mould joints leave these characteristic split lines where those joints exist. Not detrimental at all.
AshimotoK0:
--- Quote from: K2-K6 on February 24, 2024, 11:23:45 AM ---My view of the rocker faces, they definitely need attention....Newman cams a good place to have them repaired and reground to specification.
The pitting on them directly wrecks the oil film that's supposed to keep the materials apart (follower and camshaft) with likely a short life thereafter. This is often the result of poor oil condition from servicing and or, dilution of the oil from petrol contamination, short journeys etc.
Generally looks pretty clean and good condition in there.
Agree with casting marks, the method of die-casting has a jigsaw puzzle of moulds to form the shape in which to cast, when opened to get the crankcase out then imperfect mould joints leave these characteristic split lines where those joints exist. Not detrimental at all.
--- End quote ---
What do you reckon to the arrowed areas on this shot of the cam lobes please Nigel? Is that due to oil starvation/lack of oil change at correct intervals. I wouldn't personally run replacement rockers on that until it was reground. Not sure if that cam is chilled iron or not. I have seen this a lot on G5 cams and not K model cams (K model cams are usually pitted badly).
Of course there is the old adage of how many miles it will do after restoration or lack of them but I am not from that school of thought. I would want it to be right.
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