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Jul 30, 08 · The 413 is an RB big block mopar, same family as the 426 and 440, so a lot of parts will interchange There was a high performance 413 Max Wedge version that had a cross ram and big port heads and lots of compression Those are pretty cool, but rare Here's a website with info and specs on the big block moparsThe primary difference between this engine and the 413 Max Wedge, of course, was the larger bore of 425 inches, resulting in 426 ci The 426 Max Wedge was strictly designed for racing, and was offered in Plymouths as the Super Stock 426 and in Dodges as the 426 Ramcharger (the spelling was changed)Jan 29, 11 · yeah the 413 Max Wedge was one of chrysler's top performance engines in the early 60's and did very well in racingthey set alot of records and won plenty of races, the motor grew into the 426 Wedge in the mid60'sthe motor home editions of the 413 are pretty choked down with small valve heads and such, but they have plenty of potential and alot of low