Oil weight?

Your engine clearances are in the typical SBF range of .001-.003" for rod and main bearings, so chances are a 5w30 or 10w30 would be fine. I'd ask Rick what he recommends since he built it, just to be on the safe side though.

mob said:

I've seen a bunch of guys on turbo mustangs running Rotella 15-40 diesel oil.

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Good stuff.....I use it in all my cars..and my motorcycles

I generally can't use anything thinner than 10w-40 in teh Notch or the Black Pearl in the summer months. They're both high-mileage motors, and anything thinner than that those motors seem to inhale and blow out the tailpipe a lot faster. Yayyyy for worn rings!

In the winter months, I don't go thinner than 10w-30. But then, it almost never gets below freezing here, either, so ... meh.

If your motor has fairly fresh rings and bearings - like, less than 50k - then I'd stick with 5w-30, although 10w-30 isn't going to hurt anything. Going with 20w-50 seems like overkill on a "young" motor, to me.

Let us know what he says, please. I'm running 10-30 in mine with very similar clearances.

Chris

I would say you’re a little thick for those bearing clearances. What kind of oil pressure are you running? I would say 5-30 or 10-30 would be fine. I bet if you run it on the dyno make a pull with 20-50 then do a oil change with 10-30 you will pick up some power.

Remember you can actually scuff bearing if the oil is too thick especially on cold starts. Make sure that motor is good and warm before you go rag on it with that oil.

20-50 is great oil if you are getting a lot of fuel wash such as a alcohol application.

On a side note, small block chevy wrist pins

Scott

Not to thread jack, but its a similar question. I have a 100k mile stock engine, its got pretty low oil pressure and eats a lot of oil. Should I up my weight? I think im using 10w-30 right now.

That would probably be a good idea as long as you don't live in excessively cold climates.

GroverDill said:

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LOL that spec. sheet looks familiar i was looking at mine yesterday from rick, funny i just texted him hour ago about mileage before going to synthetic oil i have 1200 miles he said he likes 3000 before switching no problem i'll wait. Im gonna try that new Castrol Edge Synthetic 10w 30 with a quart of my old faithful Lucas Synthetic oil stabilizer