zed1 Posted September 23, 2017 Report Share Posted September 23, 2017 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" Thanks, Keith 1 Quote Link to comment
datzenmike Posted September 23, 2017 Report Share Posted September 23, 2017 My 620's L20B was 2". No matter it obviously works just fine. 1 Quote Link to comment
datsunrides Posted September 24, 2017 Report Share Posted September 24, 2017 1.5" on mine. 1 Quote Link to comment
420n620 Posted September 24, 2017 Report Share Posted September 24, 2017 1.5" on mine. same here on 521 j series. Quote Link to comment
XXL Posted September 26, 2017 Report Share Posted September 26, 2017 Mine is also 1.5" all the way back. (late 1968 J) 1 Quote Link to comment
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