grinding specificatios for 260 crankshaft

[Go Fleiter]

Dear Edwin,    nice to hear that You are close to solve Your engine problems!
    If You don?t get the journal specs, You can put plastigage between one rod?s bearings (oversize known) and the journal and tighten the rod cap to torque.
   After a time you can remove the plastigage and measure its thickness, getting the effective clearance.  So You can choose the right bearings.
   When doing my flattie six a couple of years ago, my shop people argued against factory specifications for clearance and torque. As I insisted on factory specs, my engine burned its bearings (and part of the journals) within one very warm summer and had to be redone.
  This time, as the rod bearing screws were nearly impossible to loosen, I let them do by good judgement, and since it runs much more smoothly.
   So: let the experienced people judge the factory specs. Maybe, however, for Your engine they are more correct.
   Who knows for proofed clearances for Edwins V 8 engine?
         Greetings! Yours Go 

[Edwin]

I live in The Netherlands. Unfortunatly my shop does not have the grinding pec for my crankshaft.
Does any one have it?
Here are the spec's.
According to my shop manual all 5 main bearings on a 241, 259, 270 hemi and poly engine are 2-3/8. I want the dimensions for 0.010 oversize bearings.

When I measure my main bearing on the crank that came out of the car the diameter is 60.26mm =2.3724 in. clearance 0.0015 to 0.0025 in.
Suppose the clearance is 0.0026. Standard main is 2-3/8 = 2.375
So if I'm calculating right the shaft journal should be 2.375-0.0026= 2.3724 in.
This is a perfect match. Looks like the shaft is still standard.

Calculating for 0.010 oversize:

For my calculations this means main bearing journal: 2.375-0.010-(clearance 0.0015)=2.3635 to (clearance 0.0025)=2.3625 in.

For the rod bearing journals 1-15/16=1.9375-0.010-(clearance 0.0015)=1.9260 to(clearance 0.0025)=1.9250 in.

Please correct me if I'm wrong. Can anyone check this with a manual?

Edwin.