According to my Service Manual, you couldnt get an inline six with a GMC 4x4 (at least in '69). You could get the base model, the KM/1500 or KM/2500, which was V6 4x4. Then was the KE/1500 and KE/2500, which were V8 4x4's.
According to ColoradoK5.com's info page, you can get the 292 in certain years of blazer, but I have heard from other members that you couldn't get a 292 in a blazer, and I must say I've never seen one. Maybe someone else can help here.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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