![]() ![]() to the crankcase for the intial start up. I'd used nothing less than a heavy-duty diesel motor oil in flat tappet engine, or full synthetic Mobil 1 15w-50, as well as adding a bottle of GM E.O.S. Are you looking for the Best Cam For 350 Tbi of 2022 These are some of the coolest Cam Kit we found so far: 1. ![]() Whereas an stock high mileage motor having the same problem would most likely be written off as simply worn out with little further investigation. not Nov.) This engine is long gone now.It now has a 520 hp 383. However, in a way high performance engines could be considered the "canary in the coal mine" for depleted ZDDP levels as numerous unexplained premature camshaft failures were experienced by reputable engine builders following proper break-in procedures. 62.7K subscribers Subscribe 1.6M views 9 years ago New small block chevy build with Comp Cams 279H Thumpr camshaft. Moreover, SAE papers as far back as the 1970's suggest a safe ZDDP level of 1200 ppm for flat tappet cams. On the contrary, even stock valve springs on a pushrod engines can develop very high pressures over the nose of the cam lobe. ![]() The main problems with flat tappet cams have been high performance, aggressively built engines, rather than conventional flat-tappet camshaft engines which SM is back-specced for.īut unless you have high pressure valve springs on a really high lift cam you might be looking at a non-problem.
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