I just got my 91 305 back from the machine shop today. I'm not sure what the main or rod bearing oil clearances should be. The shop gave me print-outs of all the specs, but that page was missing when I got home.

Here is what plastic-gauge measurements were:

Front to rear-
.0015 inch /.038 mm
.001 inch / .025 mm
.0015 inch / .038 mm
.0015 / .038
.002 / .051

 

Looks reasonable to me.

Remember, it's not a race engine, that'll be run cold with straight 40 weight in it, 10% diluted with bypass methanol; it'll be street driven with 5W30.

Why in the world are you spending all that money on a 305 short block?

 

I'm just looking for the spec numbers to make sure it's within tolerances. Do you have them?

Ugggh!!! The 305 comment is like hearing a broken record. But thanks. I'm not building a race car as you mentioned. The G92 TPI 305 is only a few horses shy of the 350 of the same vintage. It has a T5 which is questionable behind much more torque and hp than this engine has, and for once I've decided to keep a nice numbers matching, reliable, stock as possible club event car.

 

From my 1987 FSM for 305ci (L98 can have 0.0035 max clearance).

Main Bearing Clearance (service):
Front: 0.001 - 0.0015
Intermediate: 0.001 - 0.0020
Rear: 0.0025 - 0.0030

Rod Bearing Clearance (service):
0.002 - 0.0030