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Click on image for the lowdown. 
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| | | Forums66 Topics128,022 Posts1,055,362 Members48,420 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Nov 2003 Posts: 53 Member | | Member Joined: Nov 2003 Posts: 53 | Two completely different engines. The 400 is a small block; the 402 is a big block, essentially a 396 with a slight overbore (about 0.030). The 402 was sometimes marketed as a "Big-Block 400", being distinguished in the literature as the "400 4 bbl" as opposed to the "400 2 bbl" which referred to the small block. | | |
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