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i know this has probably been answered before, but i searched and couldn't find anything. this is probably a really easy question too, but all the people i've ever talked to can't give me a very good answer. what is the difference between a big block and a small block? is there a distinct line where it switches? or is it just the "heavy dutiness" of an engine (wall thickness etc.)? i would love to find a good answer to this question.
Big Block and small block are more of a chevy and dodge thing than a ford. We do refer to the 385 series and FE series as big blocks. The 220 - 351W blocks are considered small blocks. The 335 series is highly debated. Cubic inches or wall thickness has very little to do with it. Ford makes improved 351W blocks that will take a larger bore than my 390. Ford made many different V8 blocks and chevy only made 2 different styles. If you are racing your ford in a small block only event you will probably need a windsor series engine. The cleveland might also be accepted.
Originally posted by lilpig88 thanks for the info. so there really is not a distinct big and small block, just a way that certain people refer to different blocks.
Heres some mud in the water, so to speak...
The small block has a bore spacing of 4.380",
The 335 series is a small block, Bore spacing 4.380",
The FE is neither a big block, or small block, same
goes for the Y-Block...
The 385 series is a big block, bore spacing of 4.90"
But, the 351M/400, has a deck height nearly 385 series
tall, (10.302" vs 10.322") but the small block bore spacing.
Are we confused yet??
Steve & the Rockette
'72 Capri 2L
'73 Capri 2.6L V6
'73 MG B GT 2.6L V6(Ford)
'74 Capri 2L
I've read about that block, I was hoping you were talking about some long lost factory block. The experts at Car Craft said that the Dart block could probably go to 4.200" without any problems, but I think I'd be happy with whatever they'd recommend if I was gonna pay $2,000 for an engine block.
John F. Daly III
'77 F-100 LWB, 100% Aftermarket 302-R.I.P. (Stolen)
'95 F-150 SWB, 300 I-6 Now with 300,000+ miles!
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