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5.8 EFI Roller Cam Conversion

It's an industrial engine, not a drag racer. You want a motor that can run all day at 4000 rpm. Roller lifters will help about .0003%.
Keep in mind that a marine motor is always going "uphill". Generally they do not go through rapid cycles of acceleration and deceleration like a car. OMC spent millions developing an angine that would perform well and still be long lived. Why mess with it?
 
Has any one out there converted a 5.8 efi cobra motor to a roller cam and lifter. If so what is the advantage. Thanks
Bondo said:
Does yer motor Need a new cam,..??

Bill asks a valid question.

If you are over-hauling this engine, and if the present camshaft is worn out, and if you want to do this, why not?
However, be prepared to spend some money! :eek:


Your Non-Roller camshaft engine may not be equipped for the cam follower "spider style keeper" hold-down tray, so unless the block is equipped, or can be modified for the hold-down tray, you may need to go with a retro-fit system.
(these are examples only)

There will be a reduction in friction, and it will open up some possiblities for a greater array of camshaft profiles... although you'll need to stay within a Marine Engine profile range.

Roller camshafts and roller cam followers will typically go 200+K miles (or even more) in a car/truck, and will usually outlast other engine components!

Is it worth the extra cost?????
Your call!


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In addition to what Rick has already stated- The hp increase from solids to rollers is about 15-20 hp. With the proper cam for your application this can result in a significant top end increase (if you're a go-fast guy), or as much as a 20% fuel consumption decrease if you're the mid-range cruiser type.
 
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