Inliners International Forums General Discussion Hi Performance CAM set-up

Hey, I was wondering if you could put a 250 cam in a 292 like from Comp Cams????

THanks.
MATT!

You can, as long as you make sure the lobes don't hit the crank bobs or rod ends/bolts, and you use an electric fuel pump, as the pump eccentric is in a different location.

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David
newbie #4153

You will have to mill off the fuel pump lobe of the cam. It is in the center of two lobes where the rod bolts must pass. I am running a 250 cam in a 292. That is the only alteration to the cam I had to do. I already was using a ele. fuel pump. Hope this helps.

So...whats the deal with a 250 cam into a 292 anyway..??? I mean..aren't most stock 250 cams retarded or just ho-hum..??.. So what has the cam builder done to a 250 that can't be done to a 292.??..Anyone out there ever experimented with marine /sterndrive long duration cams..??..AKA=RV..The lift is supposed to be stock but the duration longer to get the boat on a plane better..Mercruiser is pretty mute on this subject..The 165 HP stern drive engine (250) is one tough cookie.!!. Al

[This message has been edited by inlineidiot (edited 09-24-2003).]

[This message has been edited by inlineidiot (edited 09-24-2003).]

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

Thanks for the reply Just A Six.I am still in a fog bank over why not just have the stock 292 cam ground for the lift you want instead of fussing with the fuel pump change with the 250 camshaft..