Phackebook Marketfarce IDIOT!!

If you have a 426, that's what you have. The only block you can "make" one out of is to bore a 413 to 426. There are only two B/RB factory strokes.....The early 350, and 361, most 383's and all 400's were B / low deck/ short stroke

Some 383's for a couple of early years were made in RB, and of course 413, 426, 440, all same long stroke. RB, or "raised block" and long stroke

Interestingly, people think of B engines as long stroke big block engines, but they actually have a shorter stroke than Chev 350