I bought the Comp XR292R cam for my 498.

Comp suggests their springs with the following specs:
1.850" installed height @ 182 lbs on the seat. This gives 479 lbs over the nose at .650" lift. Rate is 496lbs/inch. Part # 953

My AFR heads came with the following springs:
1.900" installed height @ 210lbs on the seat. This gives 510 lbs over the nose. Rate on these springs is 470 lbs/inch. Part # 8000

Comp says the cam is cast but austempered for hardness as opposed to a real steel billet.

I'm not pushing coil bind with the AFR springs.
Think I'm ok? Should I maybe set them up at 1.930" to lessen the load a bit and get a little closer to Comps specs?

The AFR springs were essentially free.

Ron

The specs on the AFR springs lool OK, as far as that goes. I would not reduce their tension in any case.

Last I knew, AFR was using K-motion or some such on their heads. Alot of people have had trouble with them. I personally would not use them; but then, after evaluating the risk/reward ratio I don't see a point in even trying. The reward (getting out of buying the right springs) is so slight compared to the risk (broken springs, inhaled valves, rolled lobes filling the oil with metal shavings, etc.).

Ask Comp if they will warranty their cam if you don't use their springs.

Ron,
Unless you had the cam ground on a billet you need to change the springs.
All the -8 comp stuff is on a cast core & anything over 450 or can be a problem.

This in my opinion with a decent solid roller sucks as I don't like to use less then 200/500 & up in most cases on a roller.

I posted this before but I had the 254/260 lobes ground on a billet & Comp recommended a spring that ended about 225.600????
Same lobes, same company, more spring, Hmmmm ;)

Ron,

I am running that cam in my motor. I am using the Dart Pro1 310cc heads. Spring rates are as follows (and I have used with no problems)
Comp 954 springs
195# seat
550# open at .666" lift
Max lift .690"

I called Comp about this spring situation. This time I got a friendly tech.

Explained the whole deal and he said the springs I have are fine as long as I set them to 1.950 instead of 1.900. This will get the seat presure to right around 200 lbs and keep the open pressure below 500lbs. He said they don't recommend more than 225 on the seat with these cams due to the fact that the core isn't billet and it could break.

So looks like I'm going to be ok here as well, which means a few more $$$ saved.

Man oh man the details one runs into when building an engine......

I'm not even going to get into the 2 bolt to 4 bolt conversion using the Milodon caps and the fact that I wish to retain the windage tray.

One other good piece of news....I can retain my ATI balancer by simply unbolting the weight. The 454 was external balanced and the 496 will be internal balanced. That info straight from ATI.

Sure glad these folks have 800 numbers.....

Onward through the fog.

Ron