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MSE4

HEAD UNLEADED LARGE VALVE,92on,NO BYPASS HOSE(+£200 /CHARGE

35.7 x 29.5mm race valves in plasma-nitrided EN214N s/steel with manganese bronze valve guides, Nominal 21.4cc with No by pass hose but heater take off holes open. This specification of cylinder head, based on used core castings, is modified to current fast road style to maximise fast road and track day/weekend-warrior performance when used with fast road and road/rally camshaft specifications. That means optimised BHP and torque out-put through port shape and dimensions and valve throat shapes developed on airflow bench and dyno/rolling roads to work with the aforementioned camshaft types, along with suitable compression ratios given modern lead-free fuel specifications. Genuine Rover copper-beryllium lead-free exhaust seat inserts are fitted. Latest specification manganese-bronze valve guides are used along with the latest specification plasma-nitrided EN214N stainless steel (35.7mm inlet and 29.5mm exhaust) and 220lb (nominal at maximum valve lift) double valve springs to give a cylinder head capable of withstanding a maximum continual peak rpm limit of 8,000rpm and 0.500" actual valve lift. Suitable for auto-testing, hill-climbs and track day use. Combustion chambers are set at an average 21.4cc since most engines these will be used for will already be using an elevated compression ratio (CR) through either smaller capacity dished pistons and/or larger bore capacities, and their efficiency will boost dynamic CR considerably. 9-stud fitting as standard. This head has no by-pass hose adapter fitted.



A surcharge for non-exchange purchase of £200 (+VAT in EU) applies. Heads supplied as exchange units must be in good re-workable condition with no cracks, in completely standard form (no modifications), and complete with valves, springs, top caps and collets.

Some companies call this a stage 3 head but our way of thinking similar to original Special Tuning is as follows-for 1275 head

Stage1 has 33mm inlet 29mm exhaust std valve sizes and gas flowed

Stage2 has 35.6mm x 29mm ex road quality valves and ported to Road Sport spec

Stage3 has 35.7mm x 29mm ex race quality valves to Super Sport/Grand Tourer spec

Stage4 as stage 3 but with either larger inlet or exhasut valves and more modified throat and port work

For real race use ask our technical staff at York or Potters Bar.
  • £964.59 exc vat
  • £1,157.51 inc vat

 In stock

 
help Recommended usage 1 x MSE4 to fit one mini.
See details below of where MSE4 is used in AKM manual.
 
Cylinder Head - Qty 1

 
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Cylinder Head

Engine

Classic Mechanical Parts Manual
 

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Fitting instructions / Articles

C-STN20 SPI PERFORMANCE KIT and C-STN20BUDGET KITSINGLE POINT 1992-1996


This kit has been specifically designed to work with the factory fitted existing single point engine management system. No modifications are necessary

Please beware that if prolonged speeds of 100mph are envisaged the engine may run lean and could eventually lead to engine failure. Power output figures of around 80bhp are normally expected after fitment but is dependant on the original engine build (rolling road tests have consistently shown 20-25% increases).

Figures confirmed by Swiftune Racing. Extra BHP can be obtained with professional air box modification. Further power increases would necessitate modifications to inlet manifold and use of a tubular steel LCB exhaust manifold. These performance figures apply equally to both kits and the only difference is the material of the valves and the different type of 1.5 rockers used. The budget kit uses forged rockers and includes 4 extra washers to shim correct alignment over the valve stems. Fit 2 of AEG168 washers between post and rock...