The easy "rule of thumb" is you want 10lb's of pressure per 1,000 rpm. 15 sounds a little low, but as long as it climbs and stays above the engine RPM, should be good (famous last words....)
1967 Firebird 400/4spd all numbers matching 1971 Camaro Pro ET Drag Car 1970 Camaro real Z-28 (needs everything) 1963 Impala 409 dual quad 4 spd 2003 Victory Vegas 2009 Pontiac G8 GT (My wife says I have a problem.....)
