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Old 04-13-2012, 07:21 AM
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sbc first start break in oil

I have a fresh rebuilt 350 that has yet to be started. It is a hydraulic flat tappet with a comp 4x4 cam in it and Vortec heads. I'm hoping to get the time to fire it off this weekend. I have a good friend who is a very experienced engine builder and he recomended Valvoline VR-1 racing oil for it's zinc additives. All the parts store had was straight 40 weight oil in the VR-1. I bought that and filled the motor along with a pint of the Comp cams break in oil additive and used a 1/2" drill and the oil pump priming tool to get the oil primed up. It took a few minutes to get oil to all the pushrods but eventually it came. I am now a little concerned I should have gone with a multi viscosity oil. Any thoughts? will I be ok? Just wanted to throw it out on here for some opinions.

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Old 04-13-2012, 07:30 AM
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first start up

IF u are using a std oil pump u should be ok.. if your using a hi vol/pressure pump... hang on.. u'll most likely be in the 100 psi area.... straight 40 is heavy.. i'm running a hi vol/press pump in my sbc and cold it runs ~75#, warm idle ~30#.. and i use 10/30
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Old 04-13-2012, 07:34 AM
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sorry, I forgot to mention it is a stock, new replacement Melling oil pump and stock size oil pan. I had almost 60 pounds oil pressure with the drill priming the pump
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Old 04-13-2012, 07:39 AM
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pressure ???

if that pump is stock type your gonna get alot higher pressue with it running... u do have a HEAVY duty pump shaft from the dizzy to the pump????? if u don't u just may be asking for a problem....
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Old 04-13-2012, 05:59 PM
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It is a melling pump shaft as well. We run straight 40w in marine 5.7 all the time. My concern is the initial start up and oil getting in all the small galleys right away I guess being a new tight motor. I can always drain it and save it for later. I saw the oil on the shelf my buddy recomended, bought it and didn't think about the oil weight right away until now.
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Old 04-13-2012, 07:13 PM
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You should be fine with that. As long as it was primed. Fire it up, run it 2500 rpm for 20 minutes to break in that nice new cam. Make sure your timing is right and keep eye on the water flow.
I think timing max 32 degreea for vortec, somone correct me if Im wrong
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Old 04-13-2012, 07:19 PM
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Quote:
Originally Posted by Richiehd
You should be fine with that. As long as it was primed. Fire it up, run it 2500 rpm for 20 minutes to break in that nice new cam. Make sure your timing is right and keep eye on the water flow.
I think timing max 32 degreea for vortec, somone correct me if Im wrong
Don't run it at a steady 2500 RPM during break-in. Vary the engine speed between 2000-2500 in order to vary the splash oiling pattern for more complete oiling of cam lobes.
Terry
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Old 04-13-2012, 09:44 PM
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Thanks guys, I will definately vary the RPM's around some during the break in process and then change the oil out. I found some multi viscosity VR1 racing oil today to run after break in. Getting close, can't wait to hear this thing go!! My friend and the machinist both estimate it around 400hp, that's gonna go pretty good in this CJ7!! The cam is a comp X4262H cam with Vortec heads and 9.7:1 compression.
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Old 04-14-2012, 03:17 AM
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Can add an extra 1/2 quart of oil (slightly over fill it to get more splash)

use zddp additive with any oil. www.Zddplus.com.

the cam is too small to make 400hp. Closer to 350hp than 400hp.

Maybe 400hp with roller cam but then we wouldn't be having this discussion about cam break in.
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