Do you mean the fuel compression nuts & pipe ends, its possible it 1/4 BSF, but I am not 100% sureGood point sorry
its a p6 3500s with I think hif6 carbs and has what looks like compression joints onto the carbs
hope that helps a bit
Hi thank youI have a fuel pipe in black nylon with male threads each end. Both are 20 tpi, one with an OD of 0.493", the other 0.429". 1/4 BSF pitch is 26tpi.
Hi thank you1/2" & 7/16" UNF are 20tpi, respectively 0.500" & 0.4375" DIA
Okay thanks for the info regards paulA bit more info - the nut that holds the reserve tap on its mount is listed as 7/16 UNF. Seems to be about 1/2 the usual thickness of a nut that size.