Re: What trucks got heat stoves in 1969?
Steven...after collecting pics of original examples for a while, I think it's safe to say that only 1/2T automatics got heat stoves in 69. No 3/4Ts (likely because they'd lag on emissions standards). No manuals (which means no 4WD trucks). Blazers were later in the model year, so all I can say is I haven't seen a 69 Blazer Auto (all were 4WD in 69) with a heat stove.
By 70, they all should have the heat stove. While it's possible you could have mismatched manifolds from the factory, I think it more likely an exhaust manifold came off at some point and the heat stove tin (as is often the case), did not get replaced.
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