Machining question.

[SlowChild3]

Im buying a 2.3 kit with main studs. I understand it has to be line bored. Do I need yo specify bearing size? Im thinking if its getting bored out then I need larger bearings. Correct?

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[evil tsi]

Im buying a 2.3 kit with main studs. I understand it has to be line bored. Do I need yo specify bearing size? Im thinking if its getting bored out then I need larger bearings. Correct?

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if its a 6 bolt motor then i would buy the kiggly main girdle before you have it line bored. if its an un cut crank then it would be standard sized bearings when you get it back. they take material off the caps, which football shapes the bore slighty, then they line bore it to get the straightness and correct size back.

 

[SlowChild3]

Ok. Thanks. That's what I was wondering how they get the egg shape out without being oversized. Makes sense now.

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[BogusSVO]

they take material off the caps, which football shapes the bore slighty, then they line bore it to get the straightness and correct size back.

This is correct.

The machine shop will line hone/bore the main journals back to the factory bearing housing bore.

You will need diffrent bearing size if the crank is ground undersize

 

[SlowChild3]

Are main studs one time use like head studs? Recommend anyway. Do the use my studs or something else?

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[evil tsi]

you can reuse the main studs and head studs, unlike the factory bolts they are not torque to yield. so they will use your main studs