Page 86 of Master Jaguar Catalog by XKs Unlimited

a xk 6-cylinder v-12 cams not legal for use on pollution controlled vehicles xks has compiled a selection of performance camshafts for the six-cylinder and the v-12 engines for nearly thirty years xks has been building and racing performance jaguar engines the table below gives you key specifications for performance camshaft selection careful consideration should be made before camshaft selection we have provided a performance ranking it is a guide only giving a typical range of application there are many variables involved in making horsepower and the collection of parts brought together by an engine builder may or may not yield the performance figures desired we have listed the cams that have performed well in our experience the fine tuning and set-up is still in your hands unless we are doing an overhaul for you this information is meant to inform and support your decision-making process the useable rpm range is derived from results of our dyno testing and on-track record keeping note too the installation of any of these cams in a pollution controlled engine that is used on public roads is against most state and/or federal regulations you should be aware of local ordinances and abide by the laws in your area we hope this presentation is a help to you and your engine builder camshafts performance ranked camshaft selection introducing xks unlimited s performance ranked camshaft selection the choice of camshafts is a critical one for power output and is often made without all the facts at your disposal most of the power increases in a jaguar high performance engine build-up are made in the cylinder head increased flow by porting and the use of larger valves is necessary so too is a camshaft dialed-in for the type of driving the engine is expected to endure overall power increase depends on many factors proper carburetion header/exhaust selection and a compression ratio suitable for the application all have a bearing as much as we would like to say install these cams and get 1 more horse5 power no problem it s not that simple the table below lists our reground and billet camshafts most are regrinds on suitable cores and are ideal for mild applications part number 1 585 7-1 1 586 7-1 1 587 7-1 1 588 7-1 1 610 7-1 1 61 7-1 1 1 592 7-1 1 593 7-1 performance rank xk-1 xk-2 xk-3 xk-4 xk-5 xk-6 v12-4 v12-5 engine a billet cam is designed and ground to be a particular profile from a steel billet to shape a cam lobe material is ground off forming the shape the designer requires when working from an existing camshaft there are limits to how much material can be removed to reshape a lobe with a new steel billet those limitations are lifted with billet cams we can achieve more performance through · greater valve lift for higher rpm · smoother ramping for less strain on the valvetrain · reduced valve float means more longevity · longer durations increase total air flow the total benefit from xks billets is more dependable and durable horsepower while more expensive our billet cams are worth the extra cost when focused on the ultimate goal of performance there are two full-race billet profiles from which to choose duration degrees 254 258 308 31 0 306 323 258 268 camlift inches .390 .404 .426 .445 .501 .518 .404 .424 useable rpm range 2000-4500 2000-5000 2500-7000 3000-7500 3500-7000 3500-7200 3500-6500 3500-7000 application xk-6 xk-6 xk-6 xk-6 xk-6 xk-6 v-12 v-12 h.p street h.p street rallye slalom full-race billets full-race billets slalom road race 82 orders 800 444-jags 5247 · fax 805 544-1664

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