100/4 Top End

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HEAVY DUTY 4 CYLINDER HEAD WASHER

Our Heavy Duty Cylinder Head Washer is a must when using an aluminium head, although is also recommended for iron heads.

PLEASE NOTE:

- 11 washers are required for 4 Cylinder
16 washers are required for 6 Cylinder

100/4 Top End
Code: CENG762
Sku: CENG762
Availability: In Stock
CENG762
£1.86
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COMPETITION HEAD GASKET

The very latest design using modern manufacturing techniques means this three layer all steel Competition Head Gasket is the best on the market. It has been made solely for us on dedicated tooling at considerable expense. Whether used on high compression race engines or simply to stop the constant water leaks down the distributor side of a standard engine, this is more than adequate to do the job. Being the same thickness as original it does not change the compression ratio and suiting bores up to 3.562" (90.5mm) diameter.

Available as a complete head set which includes all the gaskets you need when refitting a head, or as the steel head gasket only.

Our Competition Head Gasket can also be used up to three times.

100/4 Top End
Code: CENG401A
Sku: CENG401A
Availability: In Stock
CENG401A
£189.95
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Code: CENG401
Sku: CENG401
Availability: In Stock
CENG401
£199.95
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RIBBED ALUMINIUM ROCKER COVER

Finished in crackle black and highlighted with our motif. This come complete with polished Monza quick action filler cap and all fittings. Our Ribbed Aluminium Rocker Cover was designed to give extra clearance for the rocker gear, especially on engines with high-lift cams.

100/4 Top End
Code: CENG536
Sku: CENG536
Availability: In Stock
CENG536
£195.00
Qty

ROLLER ROCKER KIT

Comprising of roller rocker arms made from aircraft specification aluminium, offset steel posts, spacers and shaft. These are fully assembled, ready to fit to the engine (the push rod holes require machining a little for clearance, and valve to block clearance should be checked). They are considerably lighter and higher ratio than the standard and therefore not only reduce valve guide wear they also give increased valve lift (1.65:1 theoretical ratio).

100/4 Top End
Code: CENG502K
Sku: CENG502K
Availability: In Stock
CENG502K
£725.00
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Replacement Parts

Code: CENG702B
Sku: CENG702B
Availability: In Stock
CENG702B
£5.20
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Code: CENG702A
Sku: CENG702A
Availability: In Stock
CENG702A
£16.95
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STEEL ROCKER PEDESTALS AND SPACERS

These are much stronger than the standard aluminium ones and stop the rocker shaft from flexing and fretting. The spacers hold the rockers firm, stopping them from moving up and down the shaft.

100/4 Top End
Code: CENG508
Sku: CENG508
Availability: In Stock
CENG508
£135.00
Qty

TUFTRIDED ROCKER SHAFT

We have this specially heat-treated to give longer life under high performance conditions.

100/4 Top End
Code: CENG500
Sku: CENG500
Availability: In Stock
CENG500
£39.50
Qty

TAPPET ADJUSTER SCREW

We have reproduced the Tappet Adjuster Screw to the original design with increased high quality 3/8"BSF thread.

100/4 Top End
Code: ENG503
Sku: ENG503
Availability: In Stock
ENG503
£7.95
Qty
Code: ENG504
Sku: ENG504
Availability: In Stock
ENG504
£0.80
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BIG BORE MANIFOLD GASKET - 4 CYLINDER

Our 4 Cylinder Big Bore Manifold Gasket is manufactured from top quality materials with larger port holes.

Suitable for the 100M or Big Bore Manifolds.

100/4 Top End
Code: CENG546
Sku: CENG546
Availability: In Stock
CENG546
£16.00
Qty

MANIFOLD BLANK COVER

Protect your engine whilst it is in build, transport or storage. This thick card cover will help stop unwanted objects ending up in the ports.

100/4 Top End
Code: ENG546B
Sku: ENG546B
Availability: In Stock
ENG546B
£4.95
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NEW CAMSHAFT KITS

In 2003 we totally revised not only the way we sell our camshafts but also the design and manufacturing. We now only sell camshafts packaged complete with followers and cam lube for assembly. There are considerable differences between new and reground cams so the decision should be taken carefully. Manufactured to the original specifications with original lobe position. The oil feed to the centre journal is as standard and the lobes are made as large as possible to reduce wear. Using the best material available for long life and fully heat treated. Now also available as a Billet Blank for final profiling and heat treatment to your specification, by ourselves or your cam grinder.

PROFILES

  • DWR 1 Profile is the only camshaft which will fit without any valve pocket reliefs. This profile is similar to the original 100M cam and so works well in any standard or mildly tuned car.
  • DWR 2 Profile is high lift with 300 degrees duration (may require valve pockets). This profile is very similar to the original ‘Works' profile and ideal for race and rally cars.
  • NOW AVAILABLE DWR 4 Profile is our 100/S interpretation with 278 degrees duration, this puts it midway between our DWR 1 and DWR 2 Profiles in performance terms, providing good power with very smooth delivery. This 100S profile is equally well suited to the 100/4 - ideal for a Mille Miglia type rally car.

PLEASE NOTE: Prices include cam followers and cam lube, but not pushrods.

For a Camshaft Profile specification sheet please click the attachment below.

100/4 Top End
Code: CENG456B
Sku: CENG456B
Availability: In Stock
CENG456B
£369.00
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Code: SCENG456/4
Sku: SCENG456/4
Availability: In Stock
SCENG456/4
£595.00
Qty
Code: CENG456/2
Sku: CENG456/2
Availability: In Stock
CENG456/2
£595.00
Qty
Code: ENG456/1
Sku: ENG456/1
Availability: In Stock
ENG456/1
£595.00
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Attachments

Cam Timing Chart 4 Cyl2023.pdf Cam Timing Chart 4 Cyl2023.pdf View Download

A Little About Us...

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Welcome to the Denis Welch Motorsport website for Performance Parts. We cater for every aspect of work on your classic car be it road, race or rally, using our unrivalled success in many aspects of Motorsport to make your car as successful and reliable as possible.

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