Hello...
I was wondering if anyone could shed any light on this. My 305 LG4 decided to finally crap out. Rod knock from the #1 cylinder and #1 main bearing.
I pulled the bearings and came up with this: The connecting Rod bearings say: .0005 OS. The main bearings say: .0006 US. Are these bearings typical for an 84 LG4 or was my crankshaft machined and the bearings replaced with these? Did GM even use these bearings on new cars? They do have GM labels on them.
If these are replacements what should the car originally have had?

My dad and I were guessing that the crank was machined at one point and these bearings were put in.

Anyone know where I can find a set of bearings in these sizes?

Thanks for any help

 

most shops i've saw stamp the crank after they grind it. only way to know what you have or need is to measure it. anyone that sells bearings will have what you need. it really doesn't amtter waht WAS in it you need to measure it and figure out what the clearance is and buy the bearings to fit, or machine the crank if it's too far out.