I think all of the 68 & 69s have the smog pump (A.I.R). I don't know about the other years.
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Re: Exhaust Manifolds 66/69
Bill----
As Bob Lanham mentioned and I will confirm, ALL 1968 and 1969 Corvette big blocks(and small blocks, for that matter) were equipped with A.I.R. systems. For 1966 and 1967 Corvettes, though, only those equipped with the K-19 option(required for California delivery in 1967 for all engines and with MOST engines for 1966, excepting the L-72)were equipped with the A.I.R. system.
The confusing part for some is that the exhaust manifold CASTING numbers were the same for ALL 1966-1969 big blocks. Remember, of course, that CASTING numbers are not always the same as PART numbers. For non-A.I.R. big block engines during this period the CASTING and PART numbers were the same---GM #3880827 LH and GM #3880828 RH. However, for A.I.R.-equipped engines the CASTING numbers were the same, but the PART numbers were GM #3880833 LH and GM #3880834 RH. The latter part numbers were the ones machined for A.I.R. fittings.In Appreciation of John Hinckley -
Exhaust Manifolds 66/69
In looking at the "NCRS Spec Guide" they list the same casting number for all big block cars in all these years. The 69 cars where equiped with Smog Systems. Does that mean that all B/B cars 66-69 came so equiped? Second question since I have your attention. How many 1969 Judging Manual revisions were there from 1990 to present (2000)? The manual I have is First Edition 3rd Printing, Copyright 1989. Thanks for the help! Bill #20328Comment
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