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Guys I'm looking at building a stroker motor with my 400 and would like to use parts from my 383/440's. Can anyone give me any direction on a build guide? I was told a 470 is the way to go for power and cost. Thanks

Hey guys. I'm having a hard time reading these numbers off my h.p. big block h.p manifolds. I believe they are 69 or 70. Does anyone have a pair that may have the same numbers? I'm reading Right side 2906990 Left side 2843992-2