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I'm not sure the reasons for the change but I believe in 1970 they bored out the 396 just enough to bump it up to a 402...Ok guys....Help me out...Why did they change from a 396BB to a 402BB? Also I believe the BB's were only available on the 2wd trucks in the 67-72 years.
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I've heard (is this how rumors start?) that there was some type of casting error in the 396 blocks and GM decided to bore them out rather than scrapping or recasting. I'm not sure how much I believe this but I guess it's plausable. Again, I have never seen any other proof of this other than what's been posted here in the past.
You are correct, no BB 4x4's were offered as an RPO, and only in 2wd from 68-72
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Currently on or near the homestead:
67 Chevy SWB 2WD stepside 350/3 on tree (Pat's)
67 GMC SWB 2WD Fleet 402/auto (Brian's under construction)
67 Chevy 3/4 ton 2WD 402/auto (Business Hauler)
67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC)
68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC)
70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC)
71 Chevy SWB stepside (Crushed by tree - parts donor)
72 Chevy 3/4 ton 4WD (Parts donor)
72 Chevy 3/4 ton 4WD Suburban (Parts Donor)
72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC)
81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler)
82 Camaro Z/28 355/Super T-10 (Pat's toy)
93 Caprice 9C1 (Brian's Cop Car)
02 Toyota Camry (Reliable but a souless steel and plastic hulk)
2011 2SS RS Camaro M6 Factory Hurst Shifter 
Maybe I need to sell some of this crap 
Yet another Bozo with a sawz-all
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