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The reason I have heard for boring the 396 cu. in. to 402 cu. in. in late
1969 was because of the new 1970 emission laws. The law allowed higher
emissions output for engines over 400 cu in. The cost for Chevy to build the
402 was less then the 396 because it did not need to meet the more strict
emission laws. They still called it an SS 396 because of all the advertising
and popularity of the SS 396. They did build a non SS 402 big block engine
Chevelle called the 400 turbo jet engine and there was also a small block
engine called the 400 turbo fire. Crazy but true.
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