32 plymouth

[broker-len]

this is a model PA     motor rebuilt    new pistons and valves   adjusted valves when I got it home  head checked for being true  new head gasket    running a carter BB1 updraft carb  I just rebuilt      I believe it is timed correct     compression is   60 in all holes  wires are old but see no signs of arching--cap shows no arcking---put a vacuum gage on wiper port and it is pulsing        if I clean  the plugs they get dark right away        when driving it    can't get out of second  no power   point are gaped correctly                 what do you think-------bobnroman@yahoo.com

[ArticiferTom]

Sounds like Carb or timing . See these pdfs. leaning more to timing , mine did same with slight low reading till I adjust . Even though points set . Vacuum takes all wear and lash out of setting .

Press - Vacu test4.pdf

Press - Vacu test5.pdf

Edited May 3, 2017 by ArticiferTom (see edit history)

[broker-len]

thank you tom but I already have this info

Edited May 3, 2017 by broker-len (see edit history)

[j e weaver]

valves to tight or brunt would make vacuum pulsating

[rustyiron2]

If you hook a vacuum gauge to the running engine and read the needle fluctuation,  will need an illustration manual, it will tell you the problem(s).  Early technology still applicable for just a few bucks.  Go to Google and type in " vacuum reading char"t and you should get a printable chart.