steve williams
New Member
Hi folks, can anyone explain/advise the different numbers used on HIF carbs. Those for my 3500 1973 read AUD 521. Is it poss to fit pairs of carbs with different numbers to the vehicle?
our cars are old and have had a long life during which misdemeanours will have occurred....Be aware that the tags could have been swapped at some point in the past, the only sure way to know is to look inside especially if they're missing.
It proved impossible to get a smooth even idle and good off-idle running on my carbs so I just lived with it, it wasn't until I had them both apart when changing the needles and compared one to the other that I realised the pistons were different (even though the casting numbers were the same).
I got another pair from a forum member (which seems to have cured the problem) but the carb with the distributor vac take off is different compared to my original carb, no tags on the "new" ones but the casting numbers on the bodies are the same.