I wrote this last summer. A little more Info on this swap:
I installed my LT-1 ministarter last weekend. I bought the Corvette unit (nippondenso) because it was new and did not require a core. Part numbers:
10455709 - Corvette High Torque Starter -$166.49
12338064 - bolts 2.55 each
14037733 - bolts 3.52 each
Total came to about $180 including shipping from Dal at Van DeVere Olds.
The install was straight forward. The Crossover pipe needs to be removed, but since I replaced it four years ago, it came off easily. The Battery cable needs to be stretched to fit, but just makes it. The solenoid wire just barely fit also. Both wires have some slack when installed, but the plastic wire looms limit their movement for installation.
The difference in the bolts are that the stock bolts are about 1/2" too long (A true cheap-skate/hack like myself would re-use them) but for $6 it isn't worth the trouble of spacers.
The new Starter gear is about .100" closer to the mounting face than stock so about .100 of shim is required. A 1/16" and a 1/32" worked for me. You have to snip off the holding tab on the shims because it will hit the Transmission cooling lines if you don't. Shims were about $3.00 for a pack from auto parts store (help! or motormite)
When you take off your old starter, you run into the first really bad deal: Your flywheel may be a burred mess - mine was (still is) this will cause the new starter some grief until you deburr it (time consuming) or it deburrs itself (a couple hundred or so starts). The old starter teeth had been worn into knife edges so the burrs were no problem. I'll take care of mine when I get my tools out of storage.
Bad deal number two: the new starter doesn't come with nuts. The solenoid nut can be re-used, but the battery nut is too big. The nuts that hold the bumper supports to the bumper are the perfect size. (the one you removed to mount the airbag filler
M8x1.25 )
This is one of those repairs that can be done in 1 hr. It took me three beacause I didn't know what I was doing (thought I could get away with not taking off the crossover - wrong) and I still have to deburr my flexplate (I'll still drive it and just endure the weird looks)
Total weight savings:
The stock starter and bolts weighed 17.4 lbs.
The new starter and bolts weighs 9.0 lbs.
It was easier than trying to lose 8 lbs dieting.