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Small Block Blocks Identification :: 1964 - 1990
Small Block Blocks 1964 - 1990
Small Block Identification
- A small block measures 12" between the heads at the manifold base.
- Facing the front of the engine, at the top surface of the timing chain
area, to the left of the oil fill tube, there is a code about 1.5"
high followed by the casting number. A letter indicates a big block, a
number indicates a small block.
- Big blocks have a little hump in that area, whereas the small blocks
have a completely flat shelf.
- Small blocks from 1977 onward will have the CID or liters cast in
large numbers right above the center core plug. The engine VIN number will
also be cast onto the side of the block.
From the outside they don't look different at all because the 260, 307, 330, 350,
and 403 are all the same basic block. But externally the distributor, valve covers,
water pump, front cover, oil pan, carb, etc are the same.
[ Thanks to Chris Witt, Tony Waldner for this information ]
ID/ Casting
Code Year(s) CID Number Notes
1 '64 330 381917
2 '65 330 381917
2 '68-70 350 395558
3 330
4
5
'73,'74 350 395558
2A '76-81 260 Solid main webs for 2A's only? At least for '76.
2B ??-'81 260 557751 Windowed main webs. Windowed main webs for 2B's only?
3A
4A '77 403 557265 Solid main webs possibly
553990 for these three
554990 casting numbers.
4B '77-'79 403 557265 Windowed main webs always.
?? '85 307 556607
5A '81- 307 3161
D3 350 7582 Diesel
Please refer to the Engines
section as well!
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