Same basic short block in FWD & RWD, differences is starter mounting
bosses, and all bellhousing holes tapped vs one as a pass thru (FWD).
I bereave the heads differ between the FWD & RWD versions.
Most problems on this engine stem from intake gasket failures. Other
then that, a damn good engine. It is not uncommon to see the original
engine running well past 220K miles.
Its mainly the FWD version that has problems because of the bean-countered
"high tech" plastic intake. The RWD version used in F-bodies and other RWD
GM vehicles(Holden and Opel) uses an aluminum intake.
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