[asphaltgambler]

John's 'race' spring set comes with Titanium retainers. From other non-P car performance engine builds I've found that valve springs weaken over time, especially in air-cooled apps because the thermal cycles are much quicker (in time) and the temperature extremes are wider.

In light of what an average Porsche engine build costs just in parts, again I believe it is cheap insurance compared to shimming a 20yr old stock spring. Even John's 'street' set is a a bargain @$195. offering @10lbs higher seat pressure and @20lbs additional open over stock.


There's another post here about a guy over-reving his 3.2 and the $$$ and time consequences. True that at some extreme rpm's the valves are going to hit the pistons regardless of what spring set-up is choosen, but maybe in his situation if he had a stronger set there would be no 'accident'