I guess GM figured they would try to do the complete opposite of the Vega this time. Since the aluminum block did not work well under the cast iron head in the Vega, why not try an aluminum head (X 2) on a cast iron block?
Let's take it one step further, and do it on a diesel! I think the Duramex will go down in history as another GM diesel blunder.
Lets see, we got the Duramex, the 6. 5, the 6. 2, and perish the thought, the dreaded 5. 7 which could be found in the Gutless Cutlass!
Funny how history repeats itself.
------------------
89 D-250 LE 5 speed 3. 55 Limited slip, Banks Intercooler, 'Ol Blue Specials, K&N, Full Boar Muffler, 3" exhaust, Diesel Dynamics Stage 1 kit, Boost/Pyro. & 16cm2 215K miles.