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What HP is the engine rated at ?
The 450 HP engine got the 7/16 dia pushrods. Memory drawing a blank on the 365 HP rated engine - if not 7/16 then 3/8 dia.
 

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Pulling an old thread up... I picked up a '66 396 with these same pushrods, trying to decode them myself (and google found this thread). Appear to be 8.28" and 9.25" long 3/8" bbc pushrods. Half of mine are hosed up, probably just get a complete new set of something else to replace them..
 

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The original factory pushrod probabily won't have a part number on them . It sounds like a TRW or Elgin part number. If they are silver they are most likely case hardened carbon steel. You'd be better off buying new pushrods if you plan on making any power with this engine. If it's stock you are ok but otherwise change them.
 
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