I'm not an Isuzu guy so this is all somewhat new to me.

Things I've learned today:

Bellhousing for the 2.5 Dakota DOES bolt up nicely to the 3.2 SOHC Isuzu V6. Apparently the block has a dual bolt pattern. The inner one is the GM 60 degree pattern. Starter on the Drivers (left) side may require some clearanceing. Otherwise, good fit.

Question: Is the SOHC 3.2 bolt pattern the same as the later DOHC 3.2\3.5?

Things I've verified today:

Dakota bellhousing fits Chevy 3.1 V6, Buick 3800 V6, Cadillac 4.1 V8 and Aurora 4.0 V8.

For Aurora\Northstar usage, bell requires clearanceing around external water jackets and repositioning one bolt hole.

For other motors, bell requires cut out for starter (unless you're using a mini-starter).

Nathan, in Rear wheel drive applications, the 3.8 V6 used the Buick-Olds-Pontiac bellhousing bolt pattern. In Front wheel drive applications the engine used the GM 60 degree bellhousing bolt pattern (even though it is a 90 degree engine). The 3800 V6 is an updated and slightly modified version of the original 3.8 V6. It is only available in the 60 degree bolt pattern. All 2.8\3.1\3.4 V6's also have the 60 degree bolt pattern.

Greg