Fuel pressure

Moderator: Mod Squad

64-5mustang
Registered User
Posts: 95
Joined: Sun Sep 20, 2015 9:43 pm

Fuel pressure

Post #1 by 64-5mustang » Wed Mar 07, 2018 11:55 pm

On my old set up i was stock 66 200 with a webber 32 36 and hei, on my built motor I'm using a holly 350. On the webber I had a pressure regulator set at 3 psi. On v 8s I have nerver seen a holly used with a regulator. Can I ditch the regulator or not. Thanks in advance

User avatar
B RON CO
VIP Member
Posts: 677
Joined: Tue Apr 05, 2016 7:02 pm
Location: Long Island, NY
Contact:

Re: Fuel pressure

Post #2 by B RON CO » Thu Mar 08, 2018 5:26 am

Hi, Holley recommends 6-8 psi. Stock mechanical pump should work fine. You may need a regulator depending on the fuel pump you use. Good luck
B RON CO. Still workin' on it!

1933 Ford Pickup - 59A Flathead V8
1966 Ford Bronco - U14 - 170/200 Straight 6
1966 Ford Mustang - 289 V8

User avatar
wsa111
FSP Moderator
Posts: 2935
Joined: Sat Jan 24, 2004 5:28 pm
Location: South Carolina
Contact:

Re: Fuel pressure

Post #3 by wsa111 » Thu Mar 08, 2018 10:35 pm

You might want to keep your regulator.
Holley carbs have several float & needle & seat combinations.
To be on the safe side especially with heat soak the 6# setting might help.
Braswell & Bo Laws Auto sell many types of floats & needle & seat combinations.
I use their road race float in all my Holley carbs.
I would recommend the Holley 7448-350 carb over the Weber carb.
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, HEI dist. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
2003 Ford Lightning daily driver. Recurving Distributors. billythedistributorman@live.com
Image

64-5mustang
Registered User
Posts: 95
Joined: Sun Sep 20, 2015 9:43 pm

Re: Fuel pressure

Post #4 by 64-5mustang » Fri Mar 09, 2018 12:01 am

You alordy know the exact one that I'm going to use. And I'm more familiar with a holly than any other carb

User avatar
rbohm
Assistant Admin
Posts: 5674
Joined: Fri Nov 08, 2002 4:00 am
Location: Tucson, AZ
Contact:

Re: Fuel pressure

Post #5 by rbohm » Fri Mar 09, 2018 9:58 am

while the holley carb doesnt need a regulator, using one is a good idea. the holley and the autolite get away without using a regulator due to the large bowl volume, as well as the size of the float, compared to other carbs. the weber is sensitive to fuel pressure though, in part designed that way since the carb was designed to be able to control the fuel curve for a variety of engines compared to the american carbs.
64 falcon
66 mustang
05 grand marquis

my mind is aglow with whiriling
transient nodes of thought
careening through a cosmic vapor
of invention

Who is online

Users browsing this forum: No registered users and 22 guests