Holley Float Bowl switcheroo...

Rory McNeil · 05-27-2012, 04:16 AM

The factory high performance Ford Holleys with the center hung float bowls have threaded inlets on the primary bowl only. They had a thread in fuel filter on the drivers side, with a small transfer tube between the primary & secondary bowls. I`m not sure if you could use 2 of the Ford primary bowls for both, since the the sight plug hole is often at a different level between the pri & sec sides. Also, most of the Ford Holleys have a hole in the top of the primary float bowl, for use with a bowl vent lever setup. Not really something I would want on a rear bowl, due to potential fuel leakage on launch. Holley 4500 Dominators do have float bowls that are threaded on both sides, and I think they will work on a 4150/4160 carb. You could look into that.

BlueOval Ralph · 05-27-2012, 08:26 AM

As I remember there is a slight difference in the height of the plug for checking fuel height if you dry set the floats with a drill or calipers no worry!

bill dedman · 05-27-2012, 12:46 PM

Thank you ALL for that great information!!!

I have ordered two of the 134-108 replacements from Summit, and will now be able to avoid the hassles of having to turn the carb around.

I REALLY appreciate all the good information; I knew I could count on you guys... you're the best! Have a good weekend!!!

05-27-2012, 04:16 AM	#1
Rory McNeil VIP Member Join Date: Jun 2007 Location: from Vancouver BC Canada, now in Nova Scotia Posts: 1,311 Likes: 317 Liked 1,105 Times in 303 Posts	Re: Holley Float Bowl switcheroo... The factory high performance Ford Holleys with the center hung float bowls have threaded inlets on the primary bowl only. They had a thread in fuel filter on the drivers side, with a small transfer tube between the primary & secondary bowls. I`m not sure if you could use 2 of the Ford primary bowls for both, since the the sight plug hole is often at a different level between the pri & sec sides. Also, most of the Ford Holleys have a hole in the top of the primary float bowl, for use with a bowl vent lever setup. Not really something I would want on a rear bowl, due to potential fuel leakage on launch. Holley 4500 Dominators do have float bowls that are threaded on both sides, and I think they will work on a 4150/4160 carb. You could look into that. __________________ NHRA 6390 STK M/S 85 Mustang

05-27-2012, 08:26 AM	#2
BlueOval Ralph Banned Join Date: Feb 2008 Posts: 852 Likes: 0 Liked 0 Times in 0 Posts	Re: Holley Float Bowl switcheroo... As I remember there is a slight difference in the height of the plug for checking fuel height if you dry set the floats with a drill or calipers no worry! Last edited by BlueOval Ralph; 05-27-2012 at 03:06 PM.

05-27-2012, 12:46 PM	#3
bill dedman VIP Member Join Date: Feb 2002 Location: Conway, AR Posts: 1,739 Likes: 0 Liked 6 Times in 4 Posts	Re: Holley Float Bowl switcheroo... Thank you ALL for that great information!!! I have ordered two of the 134-108 replacements from Summit, and will now be able to avoid the hassles of having to turn the carb around. I REALLY appreciate all the good information; I knew I could count on you guys... you're the best! Have a good weekend!!! __________________ Bill