1.c Norton SOHC Head and Barrel

- High quality Stainless Steel head bolts for all 500cc Inter and SOHC Manx engines - Set of 4 sleevebolts, slightly cheaper than buying individually.  Note: Back In Stock November 2023

- High quality Stainless Steel Sleeve Bolts (head bolts) for all 500cc Inter and SOHC Manx engines

- Complete set of Sleeve Nuts and cambox bolts, as described above - High quality Stainless Steel

- High Tensile Stainless Steel Cylinder Stud Set for 350cc engines (Set of 4). Note, sometimes 350cc engines are fitted with 500cc studs and different sleeves. Please email for length details if you are unsure which to order

- High Tensile Stainless Steel Cylinder Stud Set for 500cc (and some 350cc) engines (this for single stud). These are CNC manufactured by us to the original dimensions and style and transform the look of your engine (particularly if you originals are rusty or losing their plating). Price for single stud

- High Tensile Stainless Steel Cylinder Stud Set for 500cc (and some 350cc) engines (set of 4). These are CNC manufactured by us to the original dimensions and style and transform the look of your engine (particularly if you originals are rusty or losing their plating).  Price is for set of 4 studs

- High Tensile Stainless Steel Cylinder Stud Set for 600cc engines (set of 4). The pattern for these was taken from a postwar (1949) Manx 600 engine, but they should also fit the pre-war 596 engines. Footnote: you might not recognize the 'A15' designate, but '15' was the model number allocated to 600 OHC machines . . . it is not listed in any catalogs though!

- Copper/Asbestos Type Washer used to seal exhaust pipe where it screws into cylinder head (normally requires replacement each time Union Nut is refitted). Fits all SOHC, OHV and Side Valve Norton models

This is a 79.62mm forged slipper piston to fit 500cc Norton International and Longstroke Manx (i.e. 79mm/79.62mm x 100mm) Longstroke singles with a 1.200" wide Gudgeon Pin. Manufactured by top performance piston manufacturer - Omega Pistons, to an original SOHC Norton piston pattern. Nov 2021 Update:  New batch now in stock and available

This is an 80.13mm (i.e 79.62mm +0.020thou) 500cc forged slipper piston to fit Norton International models with a 1.200" wide Gudgeon Pin. Manufactured by top performance piston manufacturer - Omega Pistons .   Nov 2021 - New batch now in stock 

This is a 79.62mm (500cc) forged slipper piston to fit Norton International and Longstroke Manx 79 (and 79.62)mm x 100mm Longstroke singles fitted with the 1.00" wide (M30/Manx type) Gudgeon Pin. Manufactured by top performance piston manufacturer - Omega Pistons.  Nov 2021 update: New batch now in stock 

This is a 79.62mm (500cc) forged slipper piston to fit Norton Racing International and Longstroke Manx 79 (and 79.62)mm x 100mm Longstroke singles - this version is very high compression - meant for alchohol/methanol fuels or racing fuels and competition use only. Manufactured by top performance piston manufacturer - Omega Pistons .  Now 21 Update - new batch now in stock

This is a 79.62mm (500cc) forged slipper piston which copies the same vital dimensions as the original 1940's-50's Norton Heplex 572 OHV (Model 18 and ES2) piston, other than having a slightly raised crown - which on most OHV models should relate to an estimated @8:1  compression ratio.  As with our SOHC slipper pistons - these are the highest quality forged slipper pistons made by top manufacturer Omega.  They are also similar to the lower compression SOHC Inter pistons, often fitted to CS1's and road going Inters (or later Inters). See detail listing for more information before ordering. Price is per piston

This is a 80.13mm (500cc) forged slipper piston which copies the same vital dimensions as the original 1940's-50's Norton Heplex 572 OHV (Model 18 and ES2) piston, other than having a slightly raised crown - which on most OHV models should relate to an estimated @8:1  compression ratio.  As with our SOHC slipper pistons - these are the highest quality forged slipper pistons made by top manufacturer Omega.  They are also similar to the lower compression SOHC Inter pistons, often fitted to CS1's and road going Inters (or later Inters). See detail listing for more information before ordering. Price is per piston

This is a listing for the Little End Bush to fit Norton Single Cylinder models - with 4 variation types.  They are available to fit most SOHC models (road going and competition type), OHV and SV models.  We also manufacture a type to allow the fitment of BSA type pistons, with 0.750" Gudgeon Pin diameter.  All are manufactured in high quality Leaded Bronze to original design.  See detail listing for more information on each variation.  Price is Each

These are modern circlips of the same size as fitted to standard Norton pistons - i.e 0.875" gudgeon pins, incase like me you sometimes buy 'New Old Stock' pistons at autojumbles, but the circlips are missing

- This is a 'Special Order' listing for SOHC Model 40 350cc pistons - that we have available to special order, using modern Hepolite replacement pistons, to the same major dimensions as original 350cc 71mm in STD (or +20) bore pistons.  See detail listing for more information 

Very nice example of the Norton SOHC exhaust nut, with the correct longer thread that differentiates them from the more common ES2 type. They are almost exact copies of the original, of the type fitted to most SOHC models, including both M30\M40 International and SOHC (Gardgengate) Manx's. 

This is the base barrel gasket of the shape originally fitted to all single cylinder 500cc models through the 1930's.  It also continued for Side Valve engines post-war, but can also be used on other 500cc post war models. Manufactured from high grade and slightly pliable oil jointing material.  See listing detail for more information

47 thou (1.2mm) thickness Stainless Steel Compression Plate. This really is a useful item andwill save you an awful lot of time with a fretsaw and file.  Used to amend compression ratio, fitted to base of barrel.

35 thou (0.9mm) thickness Stainless Steel Compression Plate. This really is a useful item andwill save you an awful lot of time with a fretsaw and file.  Used to amend compression ratio, fitted to base of barrel.

This item is for a set of Cylinder Head Sleeve Nut Washers, of the type fitted to most SOHC cast iron cylinder heads (both International and CS1).  These are CNC manufactured to fine tolerance and in stainless steel.  Price is for matched set of 4.  See detail listing for more information. Back in Stock - Sept 2024

This item is for a set of Cylinder Head Sleeve Nut Washers, of the thicker type fitted to most SOHC (and pre-Featherbed DOHC) Alloy and Bi-Metal cylinder heads (both International and Manx models).  These are CNC manufactured to fine tolerance and in stainless steel.  Price is for matched set of 4.  See detail listing for more information. Back in Stock - Sept 2024

These high quality valve guides are made to the original dimensions of SOHC Norton valve guides - this being the inlet which are bored to take the standard 11/32" diameter inlet valve.  

These high quality Oversize inlet valve guides are as per our standard SOHC valve guides (Item 0301), except these guides have an external diameter that fits into the cylinder head with an additional 1 Thou (0.001") diameter - which can help if you think you have a cylinder head which has previously had a guide move in the head, and therefore requires an additional interference fit.  See detail listing for more detail. 

Price is Each

These high quality valve guides are made to the original dimensions of SOHC Norton exhaust valve guides - with the exhaust guide on SOHC engines a bigger outer diameter, bored to take a 3/8" exhaust valve (the inlet guide is 11/32". The guide includes the important oilway from the cambox feed, which has a small countersunk face to allow for a better tolerence when fitting them.  Price is each.

This is an exact reproduction of the valve guide bottom collar that held hairpin valve springs on the Norton SOHC International model, as well as original SOHC Manx heads.  These are based on an original International valve collar - even including the patent number, but we have them cast in stainlesss steel so they do not rust, and are CNC machined.  See detail listing for more information.  Price is Each.   Update May 2023:  New batch now in stock

Hairpin valve spring manufactured to exactly the same specification and shape as the orignal type fitted to Norton International Model 30\40 engines. Price is for a set of 4 springs - which is required for one engine

Hairpin valve spring manufactured to exactly the same specification and shape as the orignal type fitted to Norton SOHC Manx Model 30M\40M engines. Price is for a set of 4 which is required for one engine

These are the brass union assemblies that screw into the front bevel gear chamber of the SOHC cambox and feed oil to the valve guides, via the small bore copper pipes. Similarly, they were also fitted to many pre-1938 OHV rockerbox's. This assembly is for an inlet valve assembly - as the union has a smaller oil feed hole than the exhaust assembly.  Supplied as complete assembly, where pipe can be modelled to fit your engine.  See detail listing for more information.  Price is per assembly.