Holley 4175 "Q-jet Replacement" carb

[Dan Gerber]

Does anybody out there have personal experience with a Holley model 4175 (p/n 80555C) "Q-jet Replacement" spreadbore carb? I'm considering replacing the custom late-model (i.e., '78 and later) Q-jet on my Buick 350 with the Holley for ease of maintenance, familiarity of local mechanics/tuners, etc.

Now I understand that the Holley is only rated at 650 cfm (as opposed to a Q-jet 750). I'm quite sure that I'm not using the full capacity of the Q-jet, since I have ported cast-iron manifolds instead of headers, anyway. That is, I think that the exhaust manifolds will be the restriction, not the carb.

The Holley carb uses the Q-jet bolt pattern, ahd has larger secondaries than primaries, so it is a real "spreadbore" carb.

Anyway, has anyone had experience with that particular Holley carb?

Hearing about your experiences will be greatly appreciated.

Thanks in advance,
Dan Gerber
Anaheim, CA

[walt whitman]

havent used one on a buick but work great on a bowtie. how heavy s your car? personally i prefer the mechanical secondary. You could save alot of $$ by getting an older q-jet though, if you get it off an olds you can change the choke therm to an electric one too just make sure it is off a 350 or larger

[copper128]

I'm running one on my '67 Olds 442 and it works great. The 400 definitely seems to like this carb. I don't think you can go wrong with the 80555 if you're looking for a Q-jet replacement. The electric choke is nice, too.

Glenn