$400 yikes for some 273 pistons? There are complete 273's in here that are cheaper, but I get it if you are going 100% rebuilt. 4bbl pistons stick out of the hole, 2bbl pistons are deep in there. Look at a 67 2bbl 318 compared to a 65 273-4, you will be suprised how close they are. And if you replace the 273 block with a 318, no one will know but you....
V8-273 2-bbl 3.625 x 3.31 8.8:1 180 @ 4200 260 @ 1600
V8-273 4-bbl 3.625 x 3.31 10.5:1 235 @ 5200 280 @ 4000
V8-318 2-bbl 3.910 x 3.31 9.2:1 230 @ 4400 340 @ 2400
