High quality Stainless Steel cambox through bolts. Screw into Sleeve Nuts - Fits all SOHC models. This is the longer front cambox bolt that fits through the main cambox casting.  Price is Each.

Price is each - but we also sell as a set of 4 cambox bolts (slightly cheaper) - which is Item 0046).

These have the correct deep Norton head hex head and top curved profile.   This allows a good purchase with both ring spanner or socket.  They also have the correct imperial cycle thread - where they screw into the SOHC (cylinder head) sleeve bolts.

Fitting Notes:

The two longer cambox bolts feed through the main casting of the SOHC cambox, while the shorter bolts feed through the two cambox 'feet' at the rear of the cambox.  The feet of the Norton cambox are a renowned weak point - so it is very important when fitting the cambox that you check that the cambox is resting evenly on top of the 4 sleeve bolts, before tightening down the cambox bolts - particularly the short/rear bolts.  Failure to do this could result in uneven pressure being applied to the rear cambox feet . . . and the worst case scenario is breaking one of the feet off - something we all dread doing!

High quality Stainless Steel cambox through bolts. Screw into Sleeve Nuts - Fits all SOHC models. This is the shorter rear cambox bolt that fits through the feet that protrude from the rear of the cambox casting.  Price is Each.

Price is each - but we also sell as a set of 4 cambox bolts (slightly cheaper - which is Item 0046).

These have the correct deep Norton head hex head and top curved profile.   This allows a good purchase with both ring spanner or socket.  They also have the correct imperial cycle thread - where they screw into the SOHC (cylinder head) sleeve bolts.

Fitting Notes:

The two longer cambox bolts feed through the main casting of the SOHC cambox, while the shorter bolts feed through the two cambox 'feet' at the rear of the cambox.  The feet of the Norton cambox are a renowned weak point - so it is very important when fitting the cambox that you check that the cambox is resting evenly on top of the 4 sleeve bolts, before tightening down the cambox bolts - particularly the short/rear bolts.  Failure to do this could result in uneven pressure being applied to the rear cambox feet . . . and the worst case scenario is breaking one of the feet off - something we all dread doing!

Set of 4 cambox bolts, both long and short, CNC machined in high quality Stainless Steel. 

These have the correct deep Norton head hex head and top curved profile.   This allows a good purchase with both ring spanner or socket.  They also have the correct imperial cycle thread - where they screw into the SOHC (cylinder head) sleeve bolts.

This listing for a set of 4 bolts

Fitting Notes:

The two longer cambox bolts feed through the main casting of the SOHC cambox, while the shorter bolts feed through the two cambox 'feet' at the rear of the cambox.  The feet of the Norton cambox are a renowned weak point - so it is very important when fitting the cambox that you check that the cambox is resting evenly on top of the 4 sleeve bolts, before tightening down the cambox bolts - particularly the short/rear bolts.  Failure to do this could result in uneven pressure being applied to the rear cambox feet . . . and the worst case scenario is breaking one of the feet off - something we all dread doing!

This is the distincive magnesium cambox cover fitted to racing SOHC camobox's, which allow for the central oil feed to the camshaft.

These were fitted to the racing (magnesium) cambox's used on competition Inter's and SOHC Manx's from the early 1930's through to the introduction of the DOHC Manx engine. This type of cover were also often fitted to the later (Featherbed) Inter models.

As always with the castings I have made - I have had patterns made using an original Norton casting to copy from, and as you can see from the photograph, they are indistinguishable from an original. These castings are cast in high quality magnesium alloy and come fully chromated (and as you can see from the photographs, sprayed in Duck Oil to protect them from corrosion in storage), and if you are intending to fit our cambox oil feed jet boss, I can also fit this for you before sending out - as per the top photograph. This listing is for the bare casting, but all other parts required for the central oil quill feed are also available in this section.

Oil Feed to SOHC Cambox - Background:

For those who may not be familiar with the history of the Carroll designed SOHC engine:  As standard the SOHC cambox was fed with oil from the crankcase - coming from an oil gallery that went to a union at the rear/top of the crankcase.  This also had a feed to the barrel walls, for lubricating the piston.  There is an adjuster in that engine bolt to regulate the amount of oil going to the barrel (which does not affect the cambox feed - which is often misunderstood).  

However, the standard 'roadgoing' model fed the oil into the cambox cam chamber through the top oilway boss - where it is fed along the outside of camshaft, through a slot on the cambshaft spacer, designed for this purpose. This seemed to work reasonably well, although it is not uncommon to find the spacer has serious score marks along its outside surface, which may reduce efficiency.

Very soon in the evolution of this engine (i.e. early 1930's) the competition version of this engine was modified to employ an oil feed directly through the centre of the camshaft, out through oiling holes in lobe of the cams, and from there into the cambox cam chamber.  This direct feed ensured a forced feed of oil directly onto the cam lobes - which due to the more extreme lift of these SOHC sports/racing engines are prone to heavy wear.  

To enable this 'central' feed, a second (lower) boss was adopted in the cambox, which had a seperate oil gallery through to the bevel cover, where the oil was then routed through a bronze quill into the camshaft.  The same design of quill was already employed in the BigEnd (on all Norton single models) - but it is important to note these quills are NOT interchangeable, the hole in the BigEnd quill is much bigger than the camshaft quill . . . and getting them the wrong way round can result in either over oiling the cambox or (far worse) - possible damage to the BigEnd.

The first competition cambox's to adopt this central oil feed were aluminium cambox's.  By the mid 1930's, Norton had introduced magnesium alloy cambox shell's and bevel cover's for it's competition models, and from that point onwards - only the competition magneisum cambox type had central oil feed to the cam's.  However both types of central oil feed cambox are easily identified because they all have a quill nut in centre of the bevel cover - as per the cover shown here.

It is also worth noting that most (all?) Featherbed roadgoing Norton International models seem to have had engines built using the magnesium cambox and central oil feed.  Although not entirely sure on the reason for this - the story I had heard most likely was, that by the early/mid 1950's Norton had stopped using the SOHC cambox for racing, and had gone over to the DOHC type.  Therefore they had stocks of racing magnesium cambox's still available - so used them up on the Featherbed roadgoing models!  This is almost certainly true as money was always tight, but it would also have offered better oiling for these engines.

As a final note - providing your aluminium cambox has the second (lower) boss in place, it is possible to retrospectively change your non-central feed alloy cambox to centre feed.  I did this to my own Racing International when I first raced it, as did not have a magnesium cambox at the time.  However, it is not a job to be taken lightly - it requires the blank lower boss boring and threading 1/4BSP.  Very carefully machining oilways in the cambox to come out in the bevel cover mating surface - to correspond to this cover.  Then the fitting of a centrally fed camshaft/quill/and this cover  . . . and to ensure your cams have holes in them for central feed.  Finally, you then fit a blanking plug into the original top feed.  This is a lot of work, but does result in better oiling to the cams - and obviously makes your Inter cambox look like an M30/early Manx! 

Update Feb 2020:  Although these are not cheap - I can assure that given the substantial price increase of magnesium alloy castings I have been quoted for other work this year - it will be inevitable that any future batch's will come with a substantial price increase. With only two companies in the UK now producing magnesium alloy castings - the price of magnesium castings have risen hugely since these were last made.

Complete cheesehead screw set for SOHC engine, in stainless steel with red fibre washers - comprising : 18 screws in total - 4 cambox front bevel screws, 6 rear cambox screws, 7 timing case screws, 1 crankcase screw and high quality fibre washer set (including obligatory spare washer!).

These cheesehead screws are 'bar-turned' in Stainless Steel, to the same dimensions as the original 1930's/50's Norton items - i.e they are machined from solid bar, rather than being mass produced 'pressed thread' items. The primary reason for doing this is that the 'cheesehead' of Norton screws of this item has a distinctive shape and was slightly wider than the proprietary cheeseheads screws available today (many modern cheeseheads are approx 0.370-0.375" head diameter), while ours are larger as per the original Norton profile).

The set consists of 18 CNC manufactured stainless steel screws and 19 high quality red fibre washers (we always include an extra fibre washer - in case you lose one under the bench!).

An original NOS (New Old Stock) Norton cheesehead screw was used as a pattern (see final photograph), these screws copy that profile exactly.

Sorry, not as cheap as some of the mass produced type available - as these screws machined specially for us from oversize bar in small batch's.

Update Jan 2021:  Now back in stock.  We will also shortly be producing similar sets for Norton OHV/SV models and 'Laydown' type Norton gearbox's, email for details at sales@racingvincent.co.uk

Inlet and Exhaust cam to fit 500cc SOHC engine - with same profile as original 500cc M30/Longstroke Manx Profile 

These cams are to the original Norton SOHC 30M 115.87 and 115.88 (i.e Longstroke Manx) profile.  Although being originally fitted to racing SOHC engines, a number of customers also like to fit them to their roadgoing engines - and I have used this profile for both methanol race engine and on the road - being just a bit more extreme in their lift profile than the original road-going 500 International profile cams we also sell (those being item 0052).

These are suitable for both road and racing 500cc Internationals (i.e. Model 30M, SOHC Manx and Model 30) machines.  

September 2019:  Pleased to say we have just had a new batch of these come in, made by our original manufacturer of many years and they look as nice as previously - I have had a set of these in my original 38 Racing Inter for many years.  And price is the same as it was in 2014.

Inlet and Exhaust cam to fit 500cc SOHC Model 30/International engine 

These cams are to the original Norton SOHC International (Model 30) 62.12 and 62.13 profile and are suitable for all Model 30 road engines from the mid 30's onwards. TheyIt can also be retrospectively fitted to CS1

However, if you wish to use the more radical 500cc M30/Longstroke Manx Profile in your Inter engine - we can also supply those, go to Item number 0051 instead

September 2019:  Pleased to say we have just had a new batch of these come in, made by our original manufacturer of many years and they look as nice as previously and price has not risen from 2014 price

Inlet and Exhaust cam set to fit 350cc (Model 40/40M) SOHC engine models

This profile is the standard International Norton SOHC 40M 64.66 and 63.89, which was fitted to both 350cc road International and post war 40M SOHC Manx models - They should also be suitable for early CS1's if you want a slightly lower profile than Inter cams.

Update September 2019: Pleased to say we have just had a new batch of these come in, made by our original manufacturer of many years and they look as nice as previously and price has not risen from 2014 price

Paper gasket to fit all SOHC cambox back plate/cambox. This gasket is made specially for us and is virtually identical to the original Norton rear cambox washer listed in pre-war Spare Parts catalog.

High quality traditional paper gasket for all SOHC Cambox bevel covers, both Manx and International.  Price is each

Specially manufactured for RacingVincent by top quality UK gasket manufacturer