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From memory the Fatso/Fatvo is the Evo stroke on Twinkie barrells, and jugs, the pistons are 3-7/8 with an Evo wrist pin.The pushrods are a special size too I think.Sputhe or Delkron cases from memory with Evo crank ,rods and timing gear, basically an Evo bottom end in the cases after market (Sputhe,Delkron,or ?) with the twinkie top end..Man I don't know if I've helped at all.Cheers.
When it comes to Merch motors the only way to know for sure is to open it up & check.
once you move the pushrode holes which tappet blocks do you use. (Evo or Twin cam)
What type of tappet blocks do i need to run
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