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At what cubic inch does an engine go from a small block to a big block?
Wiki User
∙ 10y ago
Examples-from ford/chevy, late 1954-1990s(pre modular, LS):
Chevy:
small block- 9.025" deck ht., 4.4bore spacing, 265-400ci
big block-(w and mark motor) 9.8" ht., 4.84 spacing 348-454ci
Ford:
small block-
(Y Block)- 9.77 deck ht., 4.38 B. spacing, 239-312ci.
low deck block- 8.2" ht., 4.38 B. spacing, 221-302ci.
high deck block- 9.5" ht., 4.38 B. spacing, 351ci.
Big block-
MEL block- 10.48" deck ht., 4.90Bore spacing, 383-462ci.
FE block- 10.17" deck ht., 4.90 bore spacing, 332-428ci.
385 series block- 10.322 ht., 4.90 bore spacing, 460ci.
The largest production big block was the Cadillac 500, 10.81" deck ht and a 5" bore spacing. The largest small block is the LS base Z06 427ci.( 9.24 deck ht., 4.4 bore spacing.)
Other big differences are the main journals and the weight of the engine. The weight and limit engine bay space is the main factors for the sudden jump in the size of small blocks. A 427 z06 engine aprox. 400lbs. vs. a 600lbs 427 bigblock.
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∙ 10y ago
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At what cubic inch does a engine go from a small block to a big block?
BIG BLOCK OR SMALL BLOCK DOES NOT DEPEND ON CUBIC INCHES . IT IS THE DESIGN OF THE BLOCK ITS SELF.
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