Originally Posted by willwren
The swap is a very good option if you're determined to keep the body/chassis you own. In fact, it'* still the BEST option in that regard. And it can be done in a couple weekends.
This isn't about swapping entire stock powertrains. Lets try looking at it a different way. Somebody hands you a bare block & caps and says "Go build me a motor" What are the options for the parts that go inside the block...specificly the pistons choices and the associated parts that go into the rotating assembly.
I don't believe for a moment that the stock 3800 bottom end is indestructable. What I have to work with is two motors. An LN3 with a yet to be installed M62 blower and a Series II 3800 with an M90 blower (Yeah, I scored an M90 with TB and LIM...so much for having a N/A backup motor
) The LN3, by virtue of being in the car already is the first that will likely blow, hence the first in line for a rebuild when that happens. The car can run on the spare motor during the rebuild.
This may seem a bit odd to you all. No apologies offered since this approach has worked for me for years. My 87 Camaro has a 420cid motor I built in it currently. But also has a backup 350 motor ready to go in (and it'* been in the car more than once already.) I expect the same from the Bonneville, so while dicking around with one motor, I have a ready to use spare and a plan. Probably will pick up a spare transmission along the way too.