Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine> Sbf 306 running lean???
User Name
lost password?   |   register now

Thread: Sbf 306 running lean??? Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
03-16-2013 04:37 PM
Hookedup12 Also it has 6al-2 box, msd pro billet dist. And blaster 2 coil.
03-16-2013 04:36 PM
Hookedup12 They can fix it. They are extremely good with what they do to old mustangs I've seen over 12 of the mustangs they've worked on at some of the car shows in nc, they specialize in older mustangs. They just gave me the option to try and fix what I have or go for a carb larger over the whole map not just jet and power valve that's all. They are going to Tune this carb as is. And if I want to move up ill try it with a 670 or 650 an record hp number changes. If it is worse ill drop back to 570 but if they make this one work there ain't no need to fix what ain't broke. "Custom" means it was specifically ground hydraulic flat tappet for my combo, I don't have the cam card in front of me so I can't remember right off. Other than the flat spot it runs like a raped ape.
03-16-2013 11:30 AM
Irelands child I'm assuming the carb is new
It's a very good size for a .030 SB Ford. It IS a vacuum secondary carb. It is an emissions carb (kinda). It is NOT anything more then close to being street ready in that you may have to make jet, discharge nozzles or even power valve changes to make it 'right' for your engine/camshaft(whatever a 'custom' camshaft is). Then of course is the timing, curve and initial, and is it set correctly which can show the same effects of a lean condition, i.e. blued and possibly glowing headers.

It's dam' poor dyno shop that can't diagnose and make these changes. I would run, not walk to that shop, pay them and leave - forever - and at the next shop, I would sit and watch
03-16-2013 07:56 AM
RWENUTS How,s it run besides the stumble?
What's your timing set at?
03-15-2013 10:40 PM
Sbf 306 running lean???

I have a 306 and have a 570 street avenger carb on it. I have it at the shop on the dyno and they calle and old me it's running super lean which I truly believe because all the hesitation it was having, not bog just stop then pik back up. But they said I need to step up I have it in a light 68 mustang built c4 Hughes 2400 stall, 3.50 gear, tuned long tubes, custom cam, rpm air gap, forged pistons, 10:1 comp., ported and polished gt-40 heads.

My question is should I go double pumper or vacuum secondary??? I drive it around town no freeway or such just back roads and around town, I want it to still be streetable but I'm not worried about gas mileage. They told me I could go Holley 670 street avenger or 650 dp...

Any opinions???

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 06:59 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.