You're reading it wrong. But I don't care to explain myself, because the proof is in the pudding. Why crunch your old *** OEM springs up and down to their max when you can have some ballen springs in there just making love to your lobes. Yea that's right. No reason not to.

Evo's are not some cheap DSM that you can find a longblock for $500 and off you go if you make a mistake and chew up a piston and some valves. How many 9 and 10 second cars do you see running high lift cams with stock springs? None, because they're not stupid. It's whatever blows your goat I guess

 

No I didn't have any problems. I have stock springs/retainers, but my rev limit is stock too. My car have currently about 500 HP.

I'm running on this setup from more than 1 year and when You see at my graph, my power is holding till redline without any problems so I don't see/feel any floating.

 

the reply's are great thanks, i would like to hear from more people who have kelford 272's on stock valve train, I have talked to a couple of engine builders who have also said stock should be okey with 11 mm lift, i can get kelfords for nerly half the price i can get hks but in saying that kelford can grind cams to hks spec so maybe i will go for that but will have to wait alot longer for them to have spare time to get machines setup for that, it is interesting what people are saying im sort of going towards off the shelf kelford 272 . . . i believe there is a way of measuring Clarence somehow? people who have changed springs do the new springs feel alot different i would be interested if someone could actually measure the spring pressure on stock and aftermarket springs to see if they are actually all that much different . . .
i wont be revving the car to or past stock rev limit, and i only run 20psi boost on a stock 9 turbo, its not that i am cheep either its just the difference between springs is another $1000 atleast for only "insurance purpose" and little to no actual performance gains that i could be spending on other upgrades, please dont read this as argumentative i just would like everyone to know my views as well i would like to get the most i can on stock valve train it's just the difference between hks 272 to kelford from what ive read seem to be night and day , would i be right in saying hks would be the best cam for stock valve train as per manufacture recommendations . ... thanks for all the great info

 

well im not really looking for 500hp but maybe 350-400 i am swaying towards some kelfords , thanks for the reply

 

do you think they where a good investment ? good power gains ?

 

thanks for reply do you think your 272's where well worth it , grin from ear to ear factor when you first gave it a rev out ?

 

I'm running Kelfords on stock springs/retainers, but if I had it to do over again I would have replaced the springs/retainers when I already had the motor cracked open for the cams. It's a relatively cheap thing and will let you push your redline more safely. If you don't plan on revving higher than stock the Kelfords will be fine though.

 

Do you have to take the head off to put springs and retainers in the head?

 

No, there's a valvespring compressor tool thats pretty baller that you bolt up to the head and do the springs. You just fill the cylinder with air to hold the valves up while you do it. It's pretty fun.

Comp 272 & HKS 272 = 10.8mm Intake/10.2 Exhaust

Kelford/M2 = 11mm Intake/Exhaust



http://www.streettunedmotorsports.co..._retainers.htm

^$285 for a set of proven springs and retainers, and the peace of mind and no valve float. AND you can run whatever cam you like without issue or worry of cracking a spring. I have seen busted OEM Evo 8 springs come from using Kelfords on a DSM going to 7k barely making 350whp on a Mustang Dyno, and that's only because DSM'ers are cheap enough to try it.

Everyone saying the Kelfords etc are fine on a stock valvetrain are CIRCUMSTANTIAL. Any time you push something to is material limit your just waiting for the time bomb to blow. I would like to know how many consistent track passes with respectable times/mph these people have ran. I also would like to know who all these "engine builders" and "tuners" are that recommend this

I once pondered throwing big cams in on a stock valvetrain, and also pondered drop in cams. But the fact is either option I'm not seeing my full power and usage potential. Why do it twice?

 

well ill add my 0.02 i ran hks 272 cams on my evo 8 for a total of about 45k miles of which 20k were on stock springs/retainers, the other 25k is on my built engine now but this time with bc springs/retainers, now in the near future im swapping mine for gsc s2s....now hks cams are good they make good midrange/topend power its a good combo with the 64 mm fp red, however i want more top end power and a good 20-40 hp is left on the table between hks and gsc s2s....so if you want 350-400 hp get the hks 272 cams, but ull want more power after that even if you dont wanna admit it now, ive had 385 hp dynojet for a year and want more now i want 450 on 91 octane...so thats one reason why im swapping cams to do that.

 

these compressor tools you speak of are quite pricey i believe ? do you recommend any type ?

 

good thread, im also getting close to the same situation and just spent 8 hours looking for dyno charts with close to the same setup im going for with not too much luck, but im leaning towards gsc s1s or s2s.

 

sure they where a good investment

few weeks ago i did an engine rebuild and the cams are in perfect condition absolutely no wear.

 

sure they where a good investment

few weeks ago i did an engine rebuild and the cams are in perfect condition absolutely no wear.



power is good iam lucky

 

at idle u can hear how aggressive it is, but u feel so much power gain, well with a good tune that is +2 on buying them but every1 has a good point, dont go cheap and set up ur valvetrain just in case