What is the cutoff size for a small block engine, and when does it become considered a big block?
CHEVY'S - YOUR SMALL ENGINES 302,307,305,327,350,400, AND OTHERS ARE SMALL BLOCKS, IN THERE YEARS THESE WERE THE BASE MODEL ENGINES. THE LARGER ENGINES 396,454 AHH WHAT EVER-YOU KNOW, THESE WERE THE ENGINES THAT WERE APPROVED FOR THE CERTAIN YEARS TO BE INSTALLED IN WHAT THE MANUFACTURERS CALL SPECIALTY CARS.
-PONTIAC'S REAL EASY. 1966 LEMANS 326 (SMALL BLOCK) 1966 GTO (SPECIALTY CAR) W/389 (BIG BLOCK). LATER GTO'S GOT THE PONT 400, CONSIDERED BIG BLOCK BECAUSE OF THE CAR IT WAS IN... BY THE WAY THE MUSCLE CAR ERA WAS STARTED BY PONTIAC WITH THE GTO!
-OLDSMOBILES - ANOTHER EASY ONE '64,'65,'66, & '67 F85 OR CUTLASS' CAME WITH THE 330 (BASE MODEL ENGINE) 442'S CAME WITH THE 400 (BIG BLOCK). OTHER LARGE CUBE ENGINES WERE ALSO REFERED TO AS BIG BLOCKS AND WERE USED IN EXTREMELY SPECIAL CARS LIKE THE HURST OLDS. '68 & '69 H/O'S HAD 455'S....
BUICKS THE SAME THING... CADILLAC - I THINK THEY ONLY CAME WITH LARGE CUBE ENGINES, BUT THEN WHEN DID THEY START MAKING A SMALL OR MID SIZE CAR?
THE REST ARE ALL THE SAME - FORDS, CHRYSLERS, ANY MANUFACTURER THAT MADE A MIDSIZED CAR AND WANTED TO PUT A LARGER ENGINE IN IT.
IN THE MID 60'S THE GOVERNMENT WOULD ONLY ALLOW NO BIGGER THAN 400 CUBIC INCHES FOR THOSE SPECIALTY CARS, THAT'S WHY THE HURST OLDS (455) WERE SO SPECIAL, AND THOSE COULDN'T BE FULLY PRODUCED BY GM, THEY HAD TO BE FINISHED BY GEORGE HURST TO BE SOLD TO THE PUBLIC.
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