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WINDSOR SMALLBLOCK TALK

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I saw a 221 windsor for sale today i wonder how high that th8ng will rev

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Same 2.87 inch stroke as the 289 but with a 3.5 inch bore...better to start with the 289.


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I saw a 221 windsor for sale today i wonder how high that th8ng will rev

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No better than a 289 in theory, both have same stroke. 221 has tiny pistons, sort of like what a 253 is to a 308

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221 260 and 289 all share the same stroke, the biggest problem with 221's and 260's is the small bore size doesn't let you get a decent size valve without being shrouded/running into the bore, the other problem with 221's and 260's is most them are of the 5 bolt bellhousing variety

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And a 255 (3.68 bore)
260 (3.8 bore)


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The 255 has a 3" stroke like the 302 but the crank is a lot lighter, the crank pins are semi-hollow and the counterweights are smaller. Racers in speedway stock classes used to hunt around wreckers for these cranks because they had a lower rotating mass. They could break more easily too but racing is about breaking stuff to win

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And a 255 (3.68 bore)
260 (3.8 bore)


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255 was a smog era us engine, I'd be surprised if there was any over here, apparently there's not a lot of parts interchangeability with regular 8.2 deck Windsors, but I've only ever read about those

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221 260 and 289 all share the same stroke, the biggest problem with 221's and 260's is the small bore size doesn't let you get a decent size valve without being shrouded/running into the bore, the other problem with 221's and 260's is most them are of the 5 bolt bellhousing variety
On u tube there is a 283 chev that revs to 12000rpm i was just wondering if any of these smaller c.i. windsors would be a high revver

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On u tube there is a 283 chev that revs to 12000rpm i was just wondering if any of these smaller c.i. windsors would be a high revver

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Other than the 289 not really

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The first Windsor blocks (221/260/289) can theoretically be stroked with the 2M crank from the 302 but the pistons will stick out the bottom of the bores slightly at BDC. Hardly worth worrying about that minor issue but also hardly worth bothering with as Thom said, pre-65 blocks are 5-bolt and rare as anyway.

 

On the subject of the 255, they only made them for 2 miserable years in the 80s (I think 81-82) then they gave up on that dead-end. I think they were good for something like 120 HP. But GM were doing the same thing with the SBC so Ford can't cop too much flak from it. This short production run makes them extremely rare, and pretty much irrelevant now.

 

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