I was actually talking about this with my boss at the hot rod shop and he pulled out this spec sheet that showed what filler rod should be used on 4130 depending on the governing association and it was different from Indy, Nascar, NHRA, etc. Some used er70s, others D2, and other 308. I dont remember which were for what, but I guess it varies.
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06-09-2009, 06:58 PM #21Junior Member
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- Apr 2009