Lifters can clatter, but I never heard one knock. That's usually something more serious like a rod or main bearing. Either one of these can be caused by low oil pressure, has that been checked with a mechanical gauge? If a lifter is bad, the cam will need to be checked too. If your mechanic is certain its a rocker arm, will he gaurintee it will fix the problem? Before sinking a ton of money into that engine, consider the cost of a replacement, low mile used one. These motors are known to go hundreds of thousands of trouble free miles, but once in a while one goes South prematurely, so I wouldn't be afraid of a used one. I'd get another opinion. Best of luck
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Arctic Traveller
KC6TNI
2001 GTRV
Advanced 4wd
Agile Ride improvement package
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