And again, NOPE the smallest chebbie big block was the 348!!!!!! It was the same block used as the 409 AND the 427 "W" motors! Exactly the same block on the outside smaller bore on the inside, the 427 however, got a different crank.
The 366, was in fact wasn't a "big block" at all! It was a long block, tow package motor......I had one of them years ago.....Was the biggest POS I ever seen in a Chevy Cheyanne Super, badged as a 400! Needless to say the small block 400 that was original to the truck blew, and whoever had the truck before me, replaced it with a 366.....