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Original downpipe diameter

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I want to confirm that I have a original downpipe sizing, my 1966 520 (J13 engine) measures 1.75 inches in diameter.  Can anyone confirm that the diameter on their 520 is also 1.75"




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 My 620's L20B was 2". No matter it obviously works just fine.

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1.5" on mine.

same here on 521 j series. 

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