Originally Posted By: Trav
Some of these engines had camshaft and injector issues. Higher zinc and regular OCI helps a lot, Mobil 1 0w40, Castrol 0w40, etc fits the bill. Roller lifter are not totally immune to pitting and flat spotting.
Quote:
We’ve heard of some instances of LT1 valvetrain noise caused by
roller lifters pitting and developing flat spots on some of these
engines. The underlying cause is usually too infrequent oil changes or
an oil contamination problem.
Unfortunately this engine has one of if not the worst injectors ever made, I don't even like to clean them the failure rate is so high. They rust badly inside and with ethanol fuel this issue is greatly exacerbated.
There is a great solution for this, a replacement set of Bosh EV1 injectors, they bring new life into engines that were originally equipped with the dreaded Multec I.
Great to know. The car was part of a Corvette collection, the owner ran nothing but non ethanol premium fuel in all of his cars. This will definitely continue under my watch.