main bearing gap

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main bearing gap

Post  Rabbit on July 11th 2014, 1:10 am

hey this is Rabbit I was just wondering what is too tight of a gap and too loose of a gap on the mains I got a 466 run 6500 RPM 525 HP with a lot of street use getting hard on her every now and then im getting .002 to .0025 and .003 across the board are these gaps too tight? im torqueing it down to 90 ft pds any help would be greatly appreciated
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Re: main bearing gap

Post  dfree383 on July 11th 2014, 5:30 am

.002 is too tight shoot for .003
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Re: main bearing gap

Post  bbf-falcon on July 11th 2014, 7:13 am

If its a mostly street engine I would just use a good 10w30 oil and you should be fine But,make sure these measurements are correct and measured w/mic.Anything less I would go w/1X bearing.

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Re: main bearing gap

Post  Rabbit on July 11th 2014, 2:16 pm

would you say .0035 is to loose street/strip I do have a HV oil pump 8qt pan I know HV has nothing to do with pressure but how much would pressure drop going that big of gap by experience  Question I also heard .0032 is the max I think but not to much literature on .0035 I just have to ask thanks for the reply's guys
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Re: main bearing gap

Post  bigblock t-bird on July 11th 2014, 4:14 pm

Run VR120-50 and let it eat. Steve

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Re: main bearing gap

Post  Rabbit on July 11th 2014, 9:06 pm

20-50 scratch 
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Re: main bearing gap

Post  bigblock t-bird on July 11th 2014, 9:50 pm

Valvoline VR1 20W-50 racing oil

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Re: main bearing gap

Post  Rabbit on July 11th 2014, 10:04 pm

smaller gap thicker oil? 20-50 is to thick for me
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Re: main bearing gap

Post  dfree383 on July 11th 2014, 10:47 pm

Smaller clearance = thinner oil.
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Re: main bearing gap

Post  Lem Evans on July 12th 2014, 11:05 am

Check it with 100-105 lbs. ft. rather than 90#.

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