DCzapla

Just kind of thinking out loud. I imagine its possible to bore the 281 block, maybe punch to about 289ci. Silly idea? Maybe?

danzcool

If you are wanting to bore, take a look at the cammer block specs. I believe the cammer block was bored and sleeved to 94mm (as opposed to the stock 90.2mm), with the stroke left alone. Heads where ported to match the new cylinder size, and special head gaskets also? The cammer was a 5.0 displacement. (the sleeves for the cammer are available as part: M-6055-B, if you want to make your own)

jpplaw

With a stock 3v block, I would limit boring to .020, maybe even go up to .030 but only if absolutely necessary. In any case, you wouldn't get 289 cid out of that.

If you really want more displacement, you can also do a 3.700 stroke crank, but then you have to change rod lengths; the pin height in the piston gets to be too high if you don't. And these stock rods suck anyway. So now you're talking, new pistons, rods and crank.

Ford isn't making aluminum 3v blocks anymore, but they do have iron Boss 5.0 blocks out there with a 3.700 (94mm bore), and they will take a 3.800 stroke, for a total of 326 cid.