TBH I think 4 - 5 should be OK, but it's a little high for SU/Weber/Dellorto. they should be 2 - 3.5 PSI.
Holley (and perhaps other US stuff) like 5 PSI.
TBH I think 4 - 5 should be OK, but it's a little high for SU/Weber/Dellorto. they should be 2 - 3.5 PSI.
Holley (and perhaps other US stuff) like 5 PSI.