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Hello all. I've got a '94 Suburban 6.5 turbo w/ 180k. Its got a noticeable knock on cold starts but gets somewhat quiet after warming up. I've heard that a cheap fix is using a 6.2 from a military humvee. is this practical? will i lose power? or do i have to spend $4000 on a rebuilt 6.5? thanks for any advice.
 

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Find the cause of the knock first.

An injection line touching the coolant line will cause a knocking sound, so will a bad injector, a bad vacuum pump, and a bad crank pulley....
 
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