Number refers to degrees (approximately) the cam holds the valves open - bigger numbers usually mean more 'acceleration' power at higher revs, but the cost is often less torque (pulling power) at low to medium revs - which is where you want it for driving in traffic, unless like me you enjoy battling with your own car as well as other drivers.
Generally speaking - for daily drivers up to 266, trackday weapons up to 300, racers/sprinters etc up to 320 - but you wouldn't take it to the shops......engine preparation, tuning, fuel, and driving style all make significant differences. I love the character a hot cam gives my engine - my wife hates it (LOL) Have fun! (and have a chat to Chris Ellis in Bundy -he's good value) PS bigger engines are less reactive to hotter cams, but if you put a sprint cam in a 997, you will have a three speed car - stalled, OMG make it stop!!!! and buried up the bumper of the Volvo in front...
_________________ Min - 1970 MkII S, 119hp Dave Anton 1380, SH Engineering belt drive, 1.5 rollers, 123Tune ignition, 48 DCO SP Weber, HP Headers, MSD, Maniflow ex. Swiftune SC/CR 3.7 + ATB, all KAD front, antiroll bars and gas shocks, 6 inch Minilites with Dunlop Sports
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