can they be run with stock valve springs i know obviosly a set of beehives would be a better option im just wondering if it will matter since my rev limit is at 7200

 

You Can but. is it really worth the money for what could happen

 

I agree with the above. Can they be - Yes of course. Would I recommend it - Of course not. Spend another $150-$200 and do them while your in there. There are a few tools on the market to install them while the head is on. I do most of my installs this way.

 

I don't recommend running factory springs on the 272s. You can do it, but for the minimal cost when you are already putting the cams in its stupid to not replace them.

 

I have them on my 9 everything else is stock and not one problem with it.

 

you will be fine. ESPECIALLY at 7200 rpm. if you're doing your own labor go ahead and put them in now, and put the springs in later. if you're not doing your own labor maybe try to wait until you can get some springs and or retainers to save there.


fwiw i know my cams are smaller than yours but i've been up to 8500 on stock springs with bc 272's. going on 2 years now been shifting my turbo at 8k for over a year now, no issues, no signs on valve float. i've head from people who have heard of people floating valves etc, but first hand experiences seem to be rather slim.

 

The lift on BC cams isn't a fair comparison with the Kelfords though. Stock rev limit on the Kelfords should be fine and if it's on the stock turbo, it has no reason being past 7200rpm.

 

I don't believe the duration of the cam’s has much affect of the springs; HKS 272's are fine to use with stock springs. The lift on a cam however is another matter. On the Kelfords its a much higher lift cam (I believe 11mm) then say a BC or an HKS making them harder on the stock valve train (VT) especially as the RPM's increase.

Can you use it with a stock VT?? sure, but as others have mentioned you do it at your own risk. Plus if you have a cam like that, its meant to increase power in the higher range of your RPM band, so to really take advantage of them you have to rev the car. IMO buy the VT components you need, then slap in the cams.