pnanna

Hi Gang, Same ole' story here. Noisy tappet (lifter). One thing I'd like to add though. I did the MMO and a couple of oil changes. The rap-rap goes from a tic-tic to a real loud hammering. Driving by a concrete wall with the window down is almost scary! Interesting thing that I've noted..... when cruising at highway speeds and the lifter has quieted down, then I get a pronounced preignition from the engine. Like a baby rattle shaken vigourously. When the tappet returns, the rattle goes away! The tapping doesn't bother me so much as the cycle of real loud hammering that sounds like the side of the block is getting knocked out. My plan is to just replace that whole bank of lifters on that one side. Oil pressure is good and here're some specs. 1987 GL-10, fuel injected automatic with a measly 135k on the motor. My other 1987 went 250k and never had a a tap at all! Any ideas on the preignition thing? Thanks, Paul