360 Bearings

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Charlesvolare

Charlesvolare

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I'm going through and freshening up my 360 and checked bearing clearances this past weekend. Mains are on the looser end on 0.0015", rods are on the tighter end of 0.0015", using plastigauge. I knew they were gonna be tight, but I'd feel a lot better at 0.0020"-0.0030". My crank has been turned 0.010" under and I used a fresh set on 0.010" undersized bearings to check this. The only bearings I can find to help with this would be these 0.009" undersized bearings:
Clevite MAHLE MS1266HG9: Main Bearing Set Chrysler 1974-2003 V8 360 (5.9L) with -.009" Undersize | JEGS
Clevite MAHLE CB481HN9: Connecting Rod Bearing Chrysler 1956-2003 V8 273/301/318/340/345/360; V10 488 with -.009" Undersize | JEGS

Does anyone have any info on any other bearings? Or is it feasible to have the crank turned under that minuscule amount to use the regular 0.010 under bearings? Has anyone had any luck with polishing the crank that much and it still being true?
 
Charlesvolare said:
I'm going through and freshening up my 360 and checked bearing clearances this past weekend. Mains are on the looser end on 0.0015", rods are on the tighter end of 0.0015", using plastigauge. I knew they were gonna be tight, but I'd feel a lot better at 0.0020"-0.0030". My crank has been turned 0.010" under and I used a fresh set on 0.010" undersized bearings to check this. The only bearings I can find to help with this would be these 0.009" undersized bearings:
Clevite MAHLE MS1266HG9: Main Bearing Set Chrysler 1974-2003 V8 360 (5.9L) with -.009" Undersize | JEGS
Clevite MAHLE CB481HN9: Connecting Rod Bearing Chrysler 1956-2003 V8 273/301/318/340/345/360; V10 488 with -.009" Undersize | JEGS

Does anyone have any info on any other bearings? Or is it feasible to have the crank turned under that minuscule amount to use the regular 0.010 under bearings? Has anyone had any luck with polishing the crank that much and it still being true?
Click to expand...
Charlesvolare said:
I'm going through and freshening up my 360 and checked bearing clearances this past weekend. Mains are on the looser end on 0.0015", rods are on the tighter end of 0.0015", using plastigauge. I knew they were gonna be tight, but I'd feel a lot better at 0.0020"-0.0030". My crank has been turned 0.010" under and I used a fresh set on 0.010" undersized bearings to check this. The only bearings I can find to help with this would be these 0.009" undersized bearings:
Clevite MAHLE MS1266HG9: Main Bearing Set Chrysler 1974-2003 V8 360 (5.9L) with -.009" Undersize | JEGS
Clevite MAHLE CB481HN9: Connecting Rod Bearing Chrysler 1956-2003 V8 273/301/318/340/345/360; V10 488 with -.009" Undersize | JEGS

Does anyone have any info on any other bearings? Or is it feasible to have the crank turned under that minuscule amount to use the regular 0.010 under bearings? Has anyone had any luck with polishing the crank that much and it still being true?
Click to expand...
Didn't know those bearings were a option. I don't trust the plastic gage, I would check it with a dial bore gauge. The 360 crank I had turned was too tight on the rods. Machinist tried to polish, said crank was too hard. Ended up going. 020 under on the rods.
 
Plastigauge is good for a quick check. Use a micrometer to see what you actually have.
 
MoparMike1974 said:
Plastigauge is good for a quick check. Use a micrometer to see what you actually have.
Click to expand...

I'm just wanting to see if there's any better options at opening the clearance up other than the one set of bearings I've found. Once I've looked at all the options I'll precisely check everything before final assembly.

The measurements were consistent on all five mains and the tightest rod had began showing copper through after two years of mild/light use. The 0.010" undersized bearings are tight, no doubt about it.
 
Charlesvolare said:
I'm just wanting to see if there's any better options at opening the clearance up other than the one set of bearings I've found. Once I've looked at all the options I'll precisely check everything before final assembly.

The measurements were consistent on all five mains and the tightest rod had began showing copper through after two years of mild/light use. The 0.010" undersized bearings are tight, no doubt about it.
Click to expand...

Use a bearing w/ another .001 clearance and fagetaboutit ---
 
famous bob said:
Use a bearing w/ another .001 clearance and fagetaboutit ---
Click to expand...
What choices are there for 0.009" undersized bearings? Crank is already turned 0.010 under. I've only found one set of -0.009" bearings
and I was asking if anyone else knew of any others or knew any tricks in getting the extra clearance another way.
 
Tims 66 Cuda said:
.010 bearings and polish the crank out to .011
Click to expand...


Don't like trying to polish a thou off a crank. You can get all kinds of taper, barrel and other things.

OP, what are your rod and main bores sized to? If they are at minimum (or under...seen that many times) you can open up the bores and get your clearance.

And even if you get the .001 you want, a 5w30 is all the oil you'll need. You don't need a 20w50 or something like that. No single grade oil. Ever.

If you live in a hot clime, you can use a 10w40 in the summer if you want.

I prefer a QUALITY 5w30 that is 100% synthetic. That you can run year round.
 
If I had less than desirable readings with plastigauge, my next step would be to throw a mic on there and verify them.
 
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