Quote:
Originally Posted by stevej37
so...the problem is from the factory?
|
The faulty lifters, yes. For some reason the 6.1 engines ( SRT8) of the same era do not. We have one with 170K on the clock all good. Back in the mid-70's GM was cost cutting every way possible. One of which was not heat treating their camshafts as much therefore the microscopic layer was 'thinner'.
Problem is if the engine ever ran hot or oil changes became neglected the hardness would wear off and the lobe(s) would 'wipe'. Usually on the rear cylinders / exhaust lobe. So when that happens the exhaust valve barely opens and the subsequent explosion / mixture goes back up into the intake manifold. The more you open the throttle, the worse it runs.