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Hoytster

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Chevy and Ford have both made 400+ ci engines they didn't consider "big block".
Exactly my point. There isn't just one factor that determines if the engine is a big block, but a combination. They also made big blocks that were less then 400 cubic inches. I'm talking about the combination of factors that are generally accepted in the automotive world (mainly classic cars) that defines the difference between a small block and a big block. Look it up if you have the time someday, it's kind of interesting and goes through some automotive history as to why each engine was labeled as such.
 
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Noobz347

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Exactly my point. There isn't just one factor that determines if the engine is a big block, but a combination. They also made big blocks that were less then 400 cubic inches. I'm talking about the combination of factors that are generally accepted in the automotive world (mainly classic cars) that defines the difference between a small block and a big block. Look it up if you have the time someday, it's kind of interesting and goes through some automotive history as to why each engine was labeled as such.

The whole BB vs MB vs SB thing, essentially describes the bolt pattern on the block itself. The displacement really had little to do with it other than the intent of application.

I think this is why you're getting at.
 

Hoytster

I don't dare do that to my Knob
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Yes, that would be one of the factors as well as the list of factors I listed originally. Honestly, just about every serious classic car guy I've ever talked to over the years about this has a difference of opinion when it comes to classification but there does seem to be some industry norms between them all.

In short, Ford is correct in calling this engine a big block IMO. Here are some links to some articles/discussions on this topic that appeared in a quick search I just did. I have some books that go over this but they're copyrighted.




Or maybe I'm just being an idiot and not understanding the discussion. It seemed there was some question whether this was a true big block......
 
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