Main Bearing Clearance At .0015 For 289?

K

ks65stang

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Aug 12, 2012

#1

• Aug 12, 2012

• #1

I had my machine shop undersize my crank by -0.010" and I bought +0.010" oversize bearings. I ran a strip of green Plastiguage and got .0015 clearance on the mains. Is this OK? I was shooting for .002-.003"?

Thanks in advance!

 

rbohm

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tucson,az

Aug 13, 2012

#2

• Aug 13, 2012

• #2

thats perfect.

 

Realmongo

I prefer to be called "Evil Genius"

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Oct 10, 2001

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Aug 13, 2012

#3

• Aug 13, 2012

• #3

Agreed!

Should be .001"-.0025".

 

K

ks65stang

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Aug 13, 2012

#4

• Aug 13, 2012

• #4

Thank you, that eases my mind!

 

SoCalCruising

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Aug 15, 2012

#5

• Aug 15, 2012

• #5

Watch your oil pressure. If it looks high, run (or start with) a thinner oil, like a 10W30.

 

rbohm

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tucson,az

Aug 15, 2012

#6

• Aug 15, 2012

• #6

actually runnign a 10w30 oil is good advice anyway on a new motor.

 

K

ks65stang

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Aug 15, 2012

#7

• Aug 15, 2012

• #7

I will run 10w30.

Should I run an additives? I don't want too. I used assembly lube on all parts needed and gooped the cam / lifters up real good.

I'm just waiting on some valve train parts to I can set up my rockers and hope to get it installed in a few weeks!!!

 

horseballz

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Aug 16, 2012

#8

• Aug 16, 2012

• #8

There are several ZDDP/zinc additives that are recommended, through at least your first oil change, for flat tappet cammed engines. I, personally, would keep running the additive right on through the 5K mile mark, for safety assurance. Some folks suggest using diesel engine oil or a racing oil, such as Schaeffer, Royal Purple , Joe Gibbs, etc, that are labeled "For Off Road Use Only" that still have the ZDDP in them. The recommendation seems to indicate using these oils for the long term. A bit pricey, though!
My $.02,
Gene

 

SoCalCruising

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Aug 16, 2012

#9

• Aug 16, 2012

• #9

I'd run Shell Rotella Triple protection 10W-30. Last I heard, it still had the additives. Check first.
Anyone here know for sure? I went full roller when I built the 331, so I don't keep up.

 

PoppyMod

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Aug 18, 2012

#10

• Aug 18, 2012

• #10

Hi,
You should run a straight 30w with the additives for initial break-in. Assuming no roller conversion.
Good Luck!

 

rbohm

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Aug 18, 2012

#11

• Aug 18, 2012

• #11

since you are running a flat tappet cam, i would run the zddp additive for at least the first 5000 miles. i would also switch to a good synthetic oil around 2000 miles, but i would not use race oils like royal purple, a good street oil will do just fine. after 5000 miles, you can back off using the zddp additive, i would do it at every other oil change for a while though, eventually stopping altogether at around 20,000 miles or so. there is no harm though in using the zddp additive at each oil change if you choose to do so.