Why not a 413 ?

the "sentrys" at post #17/18 are correct. i bought 2 sets of pistons for 426 years ago. 1 mw 13.5 and other 11.0. could not find block. used 413 bored .070(i think) 426/396 /454 rings, 906 heads w/312/.590 mp cam in 65 coronet sedan 6.71/10.71 car, all day long. we did flow on 2 sets of heads. both 906's. there is no appreciable flow diff between 2.14/1.81 and the 2.19/1.88. with 1.88, you have to notch the block. also larry shepard told us once that if building a 426, best to use 11.0 pistons as they will b better with 906 heads.