no there not stock rockers... there CompCams ultra pro 1.6 ratio roller rockers. or are you saying the ratio is stock? these are the lifters sealed power ht2269 they do have a hole on time and the rods have the hole through them to. we use 10w30 mobile one full synthetic once the break in oil was removed
Ahah.. I am a BIG fan of Mobil 1 and synthetics as I used to race rally cars a lot, and the reduction in oxidation and bore/ring/bearing wear is tremendous. In fact Mobil 1 saved my turbo rally engines twice.
BUT.... one thing I have found consistently is that Mobil1 is not good at keeping hydraulic lifters quiet. The reason, I think, is that *despite the viscosity numbers on the bottle, the actual viscosity is significantly thinner over most temp ranges than non-synthetics. (You can see this when you pour it out of the bottle and that is reflected in the much lower cold pour point.) Synthetics tend to be thinner over all temp ranges than non-synthetics; the only temps where the non-synthetics get as thin as synthetics will be above 200 F, which is the 'hot' temp at which the larger viscosity number is tested.
We're going to actually go for a 15W50 Mobil1 in my son's 340 to get higher ZDDP numbers (it is a flat tappet cam). Since you have a roller cam, I can't say exactly what ZDDP number you need, but it ought to be lower than the 1200-1400 PPM needed for flat tappets. But be aware that the lighter Mobil 1 weight have ZDDP around 800 PPM.