Originally Posted By: JTK
It looks like GM kept the good attributes of the latest gen 4.3L. Which AT is used in these trucks?
"The fifth generation of the iconic GM small block engine family features the same cam-in-block architecture and 4.400-inch bore centers (the distance between the centers of each cylinder) that were born with the original small block in 1955.
Dubbed EcoTec3 in the new trucks - including a 4.3L V-6, 5.3L V-8 and 6.2L V-8 - the Gen-V engine family delivers greater efficiency, performance and durability, thanks to a combination of advanced technologies including direct injection, Active Fuel Management (cylinder deactivation) and dual-equal camshaft phasing (variable valve timing) that support an advanced combustion system.
The 4.3L V-6 is based on the V-8 versions of the Gen-V family, but with two fewer cylinders - a design lineage that dates back to the previous 4.3L V-6, which was itself a Gen-II small block with a pair of cylinders removed."
Why would they go back to multiple belts from the single serpentine on my 98 4.3?
Just because bore spacing is the same doesn't mean much... Are the bolts and lineups consistent with the old 4.3? Id love to drop one in my S10 and run it on E85...