OK here is what I know, I have rods with length 5.630, and a crank with stroke 3.740, my stock block has rods with length 5.571 and a crank of 3.82, is it possible to switch the crank in from an H-series motor to an F-series, the reason I am wondering is I have the bearings, rods and pistons for the h-series crank but the bore is for a f-series. Anyone with any suggestion please help. The other advantage is that the h-series has bigger rod bearings so they will be better under pressure than the smaller F23 bearsing. What I want to do is use the rods which I have both for an H23 (5.571") or an H22(5.630") and they have a big end bore of 2.008 and the stock rods are 1.890. Any help would be great, Thanks, Jason.