Oil question

Slow_turbobird

Club Member
My uncle has a 408 the motor was always ran with 20/50

he did not kno that and he ran 10/40 he is hearing a slight

knock . The nock is there when he gives it gas but go's away

when he lets up. If he dose a oil change and runs the correct

oil and the noise go's away would u guys be worried about anything else.

And would u tear it all back down he runs tfs high ports and he dont wanna mess them up in any way.
 
Sounds like a bearing clearnce issue. Do you know what the clearances are on the rods and mains ?
 
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