currently running the gsc s1's as in my sig all mods in sig and future as well was debating soem bigger cams but want to keep stock valvetrain for now was debating s2's or hks 280's, since cams don't seem to be too bad of an install

 

i have the cossie's 272's and i have no problems with them and im on stock valvetrain, i think the 280's might be a little to aggressive

 

HKS 280's will be fine with stock springs and retainers. GSC S2's should be fine with stock springs and retainers as long as you observe the stock rev limit. I'd say go with the S2's.

 

S2's over the 280's for sure.

 

cool cool what i was leaning towards, mioght help out with the fp red too just not sure aout valve train

 

any more inputs ha

 

280 is more agressive

 

more aggressive then what?

 

HKS 280's are not necesarily more "aggressive" than Cossie M2's, the GSC S2's, or the Kelford 272's. No, they are not! You cannot just base relative duration comparisons on different manufacturer's claimed duration specs, if that is what you are going by. For the duration measurements to be comparable they would have to be taken at the same minimum lift.

 

S2s are nice. i have a set of 272s in my garage. but i would choose cosworth or kelford

side question...for cossie 272s on stock springs/retainers, what would be a safe rpm to rev it up to? i was told 8000 rpm. but i wanted to verify that.

 

as for kelfords which ones i was looking at cosworth m3's but migh tbe too much for stock vslve springs retiners