Cylinder Head

These valves are slimmer in design than the standard items and have hardened ends to remove the need for the standard valve caps. The reduced weight and reduced friction, coupled with the superior spring arrangement and alloy top collars allow the engine to rev more freely. The kit comprises of valves, springs, guides, collars and collets.

Suitable for all 350c Bullets from 1955.

This new kit contains specially improved pulsed plasma nitride treated valves with a slightly larger 1.875" inlet. The valves are specially profiled for better gasflow and have hardened ends to remove the need for the standard valve caps. They come complete with a superior design of spring arrangement, guides, alloy top collars, bottom colars and split collets.

These English made valves feature an improved profile for better gas flow and are pulsed plasma nitride treated which results in less friction and less valve guide wear. They are a simple replacement for the standard valves.

Replacement zinc plated,copper oil pipes made in our own workshop.

350 Redditch and Indian Bullets 1955-1998. Part Number: 39676

500 Redditch and Indian Bullets 1953-1998. Part Number: 38124

500 Redditch Big Head Bullets 1959-1963. Part Number: 44321

350 and 500 Indian Bullets (Electric start models). Part Number: 560025A

350 and 500 Indian Bullets 1998 on (kickstart models) This includes a banjo and union kit which reverts the engine to the smaller banjo version which helps prevent damaging threads caused by the later banjo bolts. Part Number: 39676A

A weakness of the 500cc Indian Bullet engine is the exhaust valve. The diameter of the valve head is often too small for the valve seat, this prevents the valve head from forming a fully gastight seal which can cause a burnt exhaust valve and seat. This exhaust valve is designed with an over-size head. The new valve matches the valve seat correctly, allowing an efficient gas seal. The valve features a slimmer profile, for improved gas flow (similar to our performance valves) and high quality materials. The valve is pulsed nitride treated to give the stem an extremely low co-efficient of friction (the stem is more slippery and so wears less rapidly).

These titanium valves have been designed for competition use. The inlet has an improved profile and head diameter of 1.875" and weighs 52g (the original is 84g). The exhaust weighs 44g (half the originals 88g). They are finished in a low friction, wear resistant coating. The kit is completed with copper beryllium valve seats, phosphor bronze valve guides, a superior design of spring arrangement, alloy top collars, bottom collars and split collets.

These use a premium grade light alloy for the bearing blocks, with the added advantage of being doweled for perfect alignment and machined for "O" rings to ensure maximum oil supply. The rocker arms are a slim design that reduces the reciprocating mass. This in turn reduces wear on the cam gear and tappets.

IMPORTANT NOTE: The rockers we sell are not the standard Samrat items but have been specially supplied to higher tolerances exclusively for Hitchcocks. Additionally each set is checked and finished in the UK to meet our stringent quality control. If purchasing these from your local dealer, you need to find out whether they have been obtained through Hitchcocks to ensure that they been subject to our quality checks and are not the standard Samrat items.

A European made replacement for the original exhaust valve seat with standard outside diameter or 0.005” oversize.

Note: We also have available the standard Indian made inlet valve seat, part 144775.

These are high performance valve spring top collars for the standard Bullet valve springs. Lightweight and durable.

These can also be used with our competition valve spring Part No.: VS420A but not with the valves used in our competition valve kit).

Used for lapping in valves.

The Eezi-lap valve lapper converts rotary drill to oscillating action/grinding motion. It fits to all power drills with normal 5/16" (8mm) chuck and laps valves in double quick time. Produces gas tight seals in seconds and the 22/28mm sucker heads fit most valves, not just Royal Enfields.

A tool made by ourselves to help with the removal and insertion of valve guides.

An English made phosphor bronze valve guide from our own workshop. A direct replacement for the standard Indian guide which is prone to wear.

Note: These are also available in oversizes on the outer diameter.

These are an English made alternative valve stem cap (sold each).

These can be fitted to any of the classic engine Bullets (Redditch or Indian made) to ease oil consumption.

Note: They can only be used with the standard camshafts.

A set of 3 washers for the standard decompressor.

This plug has been designed to blank off the threaded hole and corresponding opening in the exhaust port for those of you wishing to remove the decompressor. It is supplied with the sealing washers.

These competition springs allow the use of higher lift cams without becoming coil-bound. They also help resist valve bounce at higher revs for totally standard engines. Made in England.

Note: These are not the same springs as supplied with the competition valve kits.

These hardened washers are made in our own workshops. They are 2.5mm thick and have the best diameter possible to fit underneath the 6 cylinder head nuts. The standard washers are too thin and soft and get crushed on to the cylinder head stud making the head difficult to remove. Sold as a set of 6 (4 inside and 2 outside).

These are the internal cylinder head nuts, made in England using a superior EN8 material. They have the added benefit of having a cap head so that you have the option of tightening with a spanner or Allen key.

Note: These are SOLD INDIVIDUALLY, order 4 for a FULL SET.

These English made cylinder head studs are manufactured out of EN8 and have a square machined onto the top. These are easily removed with a 1/4" T handle or socket set extension whilst the cylinder head is still in place. This then allows the cylinder head to be removed easily.

Note: Supplied as a set of 6.

These are the rubbers fitted to the EFI models as standard and can be trimmed to be used on the cylinder barrels of the older Bullets. They help deaden the noise especially from the alloy barrels.

Note: 6 to a set.

We start with a brand new late model Indian made head (these use the hardened valve seats). We reshape and gas flow to a 32mm (28mm on the 350cc) inlet port and fit English made phosphor bronze valve guides. On the 500/535 the valves are specially improved nitrile treated with a larger 1.875" inlet. The valves are specially profiled for better gas flow. The 350 and 500/535 come complete with a superior design of spring arrangement, including alloy top collars, and improved split collets. Supplied ready assembled.

We have bitten the bullet on this one and invested heavily in re-introducing the spectacular “Bighead” fitted on the 500 Bullets from 1959—1963. This is an all English made product manufactured to a high quality using the original factory drawings. It is available in the standard bighead form or with the massive inlet port to suit the 1.5” Grand-Prix carburettor fitted on the Fury. These heads have many design advantages over the conventional heads including semi downdraft carburettor, rockers running on fixed spindles, 80 degree valve angles, superior valve and spring design with large inlet valve which all help to give an instant improved performance gain. With its large fins and overall shape, it will enhance the look of the Bullet engine dramatically.

To convert the Indian made Bullets, you will need the standard bighead along with the fixing kit which comprises of everything needed to convert including valves, springs, rockers, covers, studs, gaskets, oil feed pipe, head steady and pushrods etc.

Please note: That the standard Indian tank will need some small modification to the underside to give the required clearance.

Fixing Kit for the BIGHEAD detailed above.

These are a modern material for the classic engines.
The 500cc gasket is an American made product with flame ring which we have developed and tested in both competition and road models, we have used these without sealant and they have proved excellent.
The 350cc gasket is the latest development from the Indian factory and also has been tested with excellent results.

These gaskets are available in the std 1mm thickness or a thinner 0.5mm which will raise the compression ratio. Being solid copper they can be annealed and reused. Care must be taken when fitting the 0.5mm head gasket that the spigot on the cylinder barrel is reduced accordingly.

Note: We would suggest that you always use a sealant on the head gasket, we use Wellseal (see the Tools and Sealants section of this catalogue).