Sbc mild cam after break in - CK-4 Rotella T4 10w30?

T

theraymondguy

Joined
Dec 13, 2014
Messages
15
Location
ON, Canada
I've just completed a flat tappet cam replacement in my 1984 Pontiac Firebird, 305 LG4.

Engine was running fine, though the limpest camshaft GM ever put in a sbc.

Now running a 420/443 112 lsa cam (old school "stage 1" grind). I used Driven BR30 break in oil and their assembly grease at manufacturers recommendation, I believe with great success.

I have been running Rotella T4 10w30 CK-4 for about the last 2 years, mostly out of convenience. Car does about 2000 miles per year.

53'Stude posted a VOA Nov 2020

Rotella T4 10w30 VOA

Since I didn’t see a VOA for Rotella T4 10w30 I sent one in. CK4 rated also.
bobistheoilguy.com

At 1174 phosphorus and 1310 Zinc, am I in the range for a mild cam running stock springs?

F6E6C146-0787-4FBD-B70A-9CDB1A912571.jpg
 
Thank you for the reply. I’m a little worried about the calcium number at 2000…

The engine is numbers matching and clean, and I mean clean. No sludge etc which is fantastic, it was clearly well maintained prior to my ownership as well.
 
Sorry ripcord, I’m a bit of an oil noob - I might’ve posted before having the full picture laid out. From what I’ve gleaned, the break in oil I used is preferred due to its low detergent quantity, it seems a bit counterintuitive to go with a “high” detergent oil immediately following break in?

If I understand the detergent may undermine the zinc?
 
You're fine with that oil though I would personally want to run Driven GP-1 10W-30 if you wanted a conventional or blend.

The 2000 Ca isn't an issue.
 
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