Common rebuild machining procedures?

[87'GTstang]

At what point would you actually regrind a crank say .010" undercut with the use of oversized bearings for a rebuild? Would it be limited to such things as a spun bearing or very excessive wear? Who would just use standard size bearings and put it back in there?

Same thing goes for factory connecting rods - when would you consider it a normal routine to have then straightened, magnafluxed, and resized?


Also what seems to be the common things all used to balance an assembly (basically what has everyone had to bring for a balance job on a rotating assembly)?

Lastly of all, when balancing, who ops for stock 50 oz imbalance and who opts for 28 or even 0 oz and why?

 

[brad8750]

They do make an oversized in 0.01 and 0.02 sizes so if you plastigauge and find you need more, you have that option. Most of the time if you have light grooves or abrasions it can be polished out and it is not a big deal. I would not use anything more than 10 under on a crank on a high horse appliction. You need to check the rods....period it is the weak link other than the block. You need to resize if you put new rod cap bolts in. When you balance a motor you need to have pistons, rods, crank, balancer and the flywheel/flexplate they are weighed and spin balanced according. The balance of the motor as far as oz is based off of the year and make of the motor, it really isnt an option.