Helloooo! What can we do for you? I sent off your question about 3.8L main bolts to one of my contacts and am waiting to hear back. In the meantime, you might want to look at our article on Rebuilding Buick 3.8L engine. Might help. Couldn't hurt.
Brendan
Brendan Baker
Senior Editor
Engine Builder Magazine
www.enginebuildermag.com