Springs and lifters.

You could make the investment now in a set of SM Composite lifters, no break-in, no cam wear, swap cams anytime and they'll also fit the 440.

One set of lifters will probably last you a lifetime, 20 cams and 10 motors if you want. Put them in any hole, on any cam, no cam lube, no break-in, any engine , in any hole, no eating cams ever again.

There new Street Hydraulic with .100 travel sets up just like a stock lifter, silent run... Cheapest insurance you can get for your motor.

Go through this board and see how many guys have lost their motors because of Cam Failure, do you want to be on that list?

Not to mention the gain in top end HP (usually 25-40) because of the increased spring pressures now controlling the valve on the seat which is exactly why Automotive roller lifters were developed in the 40's-50's.

It's 2009 the technology is here to prevent all these problems.

Rebuild engine after wiping out cam $3000 (If your lucky, it can go much higher)
SM Lifters $720
Save $2180.00

Over 10 years most guys will re-cam, rebuild or re-motor 3-4 times and each time you do that break-in your rolling the dice... Mix a little eye of bat, lip of chicken and armpit hair of snake together add 1 oz. to oil and cross all toes and fingers, turn the key and pray.

Or.....fire it up and go...."your in good hands."