I have a 91 sierra with a 4.3L and 194,000 miles on it. My question is would you suggest a re-manufactured engine or rebuild it? Most guys around my area say it would be as cheap for a remanufactured engine. The only problem is trying to find a reputable engine company. I don't trust Auto Zone and GM offers their re-manufactured 4.3 at $2600.00 plus $600.00 the dealer wants for the installation. Seems high but it carries a 3 year 50,000 mile warranty plus if the dealer installs it I shouldn't get the run around if something happens to it. The truck is in real good shape and I only gave $2300.00 for it so I feel it is worth fixing compared to buying a new one.