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
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
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
