Quote:
Originally Posted by unruhjonny
Additionally, that book doesn't list the two casting numbers of intake manifolds used in 1968;
I believe (going off memory here) the change over was somewhere just before the introduction of the RAII.
All RAII engines should have the later casting intake manifold.
'early' intake manifold: 9790140
'late' intake manifold: 9794234
The late intake manifold had the same size runners as the prior D-port engines, and was NOT the taller runners that the RAIV & 455HO/SD455 used.
For a brief time, my cousin had what may have been the very latest built RAI Firebird; it had the later intake manifold casting number.
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From what I've seen while looking for a date correct manifold, was the changeover date was around March 16-18.