Oil Viscosity

Old 04-24-2009, 01:38 PM
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jreiley
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Default Oil Viscosity

What weight oil would be correct for brake in and then for after break in for a blown bbc?
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Old 04-24-2009, 04:47 PM
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wmeabates
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I allways use a strait wieght oil for brake in because of what is in a multi wieght is not good with high heat,like where the rings run on a fresh hone. 30w warmed a little is before the first start is good.If it's a flat tappet cam a racing oil should be used.That what works for me.Bill
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Old 04-24-2009, 07:41 PM
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kwkracing
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Depends how loose the motor is? I run 60 weight valvoline racing oil plus some marvel mystery oil in my blown injected bbc
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Old 04-25-2009, 06:46 AM
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jreiley
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I don't know what the tolerances are for the mains and rod bearings, but I can find out seeing as how the engine isn't totally assembled yet. Is there any guide lines I could use? Thanks.
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Old 04-25-2009, 09:31 AM
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bbchevy
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Default Oil

Brad Penn makes a Brake in Oil.It has Loads of the GOODIES that a Fresh Motor NEEDS!!!
Later
G 8)
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Old 04-25-2009, 01:42 PM
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oldandtired
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Default Re: Oil

Originally Posted by bbchevy
Brad Penn makes a Brake in Oil.It has Loads of the GOODIES that a Fresh Motor NEEDS!!!
Later
G 8)
x2
Penn Grade 1 for break in at $6/qt and like BBChevy said it's got lots of "zippitydodaday" in it. Only 30 wt but breaking in a flat tappet cam you won't be under 2000 rpm anyway.
If possible, run reduced ratio lifters or remove inner valve springs during break in. This is one of my personal streadfast rules.
Good luck, Dave
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Old 04-26-2009, 05:33 PM
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TS1955
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Lucas also makes a good "Break In" additive also. Part # 10063 which cantains Zinc. Can also be used in each oil change too.

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Old 04-27-2009, 07:34 AM
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jreiley
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That's good to know about the Lucas product. They are readily available around here where Penn isn't.
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Old 04-27-2009, 10:48 PM
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russ67chevelle
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agreed that main and rod clearance should dictate weight of oil. comp cams has a break in oil additive toooooo
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