Most all of the grinds available over the counter for 250's mimic smallblock grinds in terms of lift and duration. With the longer stroke 292, it's usually better (for street anyways) to use higher lift and not big duration. Then the torque is still high without making the rpm range sky-high, which is not so good for the 292.
By the way, the stock 250 cams are identical to the stock 292 cams except for fuel pump cam location. And RV cams are generally high lift for torque and barely more than stock duration to keep the torque curve low in the rpm band. Marine cams are chosen for a specific rpm range to match a prop and it's efficiency to the boat's limits. That's where correct duration comes in to place the torque peak at exactly the right rpm.
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David
newbie #4153
