Main bearing spacers

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Main bearing spacers

Post  EverySparePenny on October 13th 2018, 11:12 pm

Are they used anymore? Where do I find them? Best installation technique?

Collecting for the new short block, have found several used billet cranks in useable stroke lengths but most have a 2.750 or smaller main.

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Re: Main bearing spacers

Post  BBFTorino on October 13th 2018, 11:25 pm

Roushe used to carry them, dont know any more. But perhaps some of the builders / suppliers on here can source them.

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Re: Main bearing spacers

Post  Paul Kane on October 20th 2018, 11:41 am

Of course!  Thanks Mark!  This is exactly how we make full-groove main bearings for 460s these days, didn’t think about doing the same with bearings spacers! We grabbed a set. Cool
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Re: Main bearing spacers

Post  Bill Heard on October 20th 2018, 1:02 pm

What's the difference between a main bearing spacer and a main bearing (insert) ?
I think I'm missing something here. But that's nothing new for me...…………..
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Re: Main bearing spacers

Post  Mark O'Neal on October 23rd 2018, 1:28 am

A spacer is used to reduce the size of the crankshaft main journal...in this case from 3.000 to 2.750. The insert is the bearing.

So you install the spacer and the insert on top of that.

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Re: Main bearing spacers

Post  Bill Heard on October 23rd 2018, 3:04 am

OK thanks...…….never heard of that before. So you would take a ford crank and turn the main bearing from 3 in. to 2.75 to have a smaller bearing surface......interesting.
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Re: Main bearing spacers

Post  jasonf on October 23rd 2018, 6:58 pm

Bill Heard wrote:OK thanks...…….never heard of that before.  So you would take a ford crank and turn the main bearing from 3 in. to 2.75 to have a smaller bearing surface......interesting.

You would use a crank that already has 2.75 mains.
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Re: Main bearing spacers

Post  Bill Heard on October 23rd 2018, 7:08 pm

OK I get it now, just a little slow.....thanks again
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