Absolutely sure your timing is spot on? Since it accelerates ok and seems to backfire at higher rpms you might have the valves a bit tight. Just throwing out ideas. Good luck🛠


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
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