Flex Plate Suggestion for 340 w/904

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HotRod20

HotRod20

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Running a 904 behind a 340 soon. I'm at the point of needing a flexpalte for engine balancing.
I will be using a Hughes 27-30HD convertor. Behind my engine it should provide about 2700 stall. Seems like a flexplate for a 904 is hard to find on Summit or Jegs for a 904 trans thats SFI rated fleaxplate... any recommendations from experience?? seems catalogs only list SFI flexplates for 727. Anyone else running this combo? Thanks.
HR20
 
Flex plates for internally balanced engines should interchange between the 904 & 727. I used an SFI 727 flex plate when I changed over to 904 in my bracket car. I made sure I measured to make sure everything would mate up correctly.
 
A stock 318 works fine.

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