Totally agree the vacuum secodary holley is the most simple design forgiving carb on the planet, the 4150 vacuum secondary model does give an easier option for jet changes then the 4160 version with a metering plate. Carbs if something is wrong with one you don't know how to fix one, you could be in holley hell, Q-jet hell or edelbrock hell.

 

I have had a Holley 4175 on my 78 L-82 4 speed for 23 years now with zero rebuilds and guys it runs perfect except for the occassional multiple engine cranking if left unattended for over a couple of days when cold (3 cranks to be exact). Running and hot starts are perfect. Changing jets is easy and I like the vacuum secondaries. Mileage is not bad either. I changed from the original quadrajet in 1985 since it was making the car run poorly, although I have heard that a properly setup and tuned quadrajet is a pretty good carb as long as you stay on top of it. My 4175 has been troublefree except for the floats draining issue.

 

I'll take my buddy and the work he's done vs. you or anyone else you care to bring along Mr. Canada, but thanks for playing.

Just because I didn't get into the details of the issues on this carb does not mean he can't tune one.

The point of this thread was to suggest a new carb. I don't need to explain why the old one needs to go.

 

Thanks for the specific suggestions guys. So-

-Which is a better choice for a driver, not particularly performance driving? The 4150, 4160 or 4175?

and

-what "floats draining issue?"

 

I am not a carb expert but the 4175 I use is a direct replacement for the spreadbore quadrajet meaning it will fit on an OEM spreadbore intake manifold. The 4150 and 4160 model holley's are square bore carbs for a square bore intake. If your car originally had a quadrajet carb and you are using the original intake you would need a 4175 on that setup. The 4150/4160, I believe, are also available in different CFM ratings such as 650, 750, etc. The 4175 is rated at 650 CFM which is perfect for a stock/slightly modified street engine and is close to the original quadrajet's rating of 700 CFM rating. I have been under the impression that one does not want to over carb for the street since it will actually hurt perfrormance and driveabiilty. The 4175 Holley is the direct replacement for a quadrajet and comes with vacuum,not mechnical secondaries, again similiar to the original quadrajet's secondary mechanism, although not exactly the same process. Everyone says that you do not want mechanical secondaries on a street engine. As for the "draining float issue", I am sure someone else knows more about it than I do since I have never had the carb apart, but apparently, one of the internal parts in my 4175 has gone bad allowing the gas to drain from the float bowls if the car sits for over 48 hours but it has no effect on normal starting and driveability which is why I have not been in any rush to take the carb apart to correct. I have been very happy with my 4175 for 23 years and I am surpirsed that it has lasted this long with no rebuild.

 

Thanks, jb

 

If "the car sputters after shut off" it may not be the carbs fault. If the idle is too high the motor can "run on" after you cut off the ignition. Low octane gas can compound that problem.

 

You ask a completely subjective question and then your surprised that there is no consensus .... " What year is the best Corvette "

 

[QUOTE" What year is the best Corvette " [/QUOTE]

1977

 

That was a rebuilt one? not a NOS?