All B-RB heads are interchangeable. CID - bore x str lo block 361 - 4.14 x 3.38 383 - 4.25 x 3.38 400 - 4.34 x 3.38 reg block 413 - 4.18 x 3.75 426 - 4.25 x 3.75 440 - 4.32 x 3.75 source: Mopar Engines Scott Monfort wrote: > Does anyone know what the bore sizes for a 383 and 413 are? I'm wanting to > swap 906 heads on to the 413, and I'm wondering if there'll be any interference > problems. > > Scott Monfort
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