holley 6919 tuning

Reply Subscribe

Thread Tools

Search this Thread

Mar 14, 2007 | 09:47 PM

exploderjoe

Thread Starter

New User

Joined: Nov 2006

Posts: 11

Likes: 0

holley 6919 tuning

I have a holley list 6919 on my 85 460, this carb has the reverse idle system. I have the idle mixture screws all the way in, which is were I have the highest vacuum reading and the engine still idles slightly rough. It seems to me that I am running lean. What jet size do I have now? and how many sizes should I go up?

Mar 14, 2007 | 10:26 PM

LxMan1

Moderator

Joined: Dec 2001

Posts: 22,436

Likes: 17

From: Louisville,Ky.

Well, It came with 622 jets. Which are emmisions exact sized 62 jets.
I would try 65 jets. But I don't know if this will help the idle. How does it run other than a rough idle? I am guessing you have checked everywhere for a vacuum leak. What intake manifold do you have?

Here is the Holley link for carb info http://www.holley.com/data/TechServi...%20Listing.pdf

Mar 14, 2007 | 10:57 PM

exploderjoe

Thread Starter

New User

Joined: Nov 2006

Posts: 11

Likes: 0

I just switched to a Edlebrock performer manifold after having problems with vacuum leaks with the factory manifold,the roughness it smoooths out as the rpm's increase and if I stomp on it, well it will pin you back.
on my vacuum gauge I have a high and fairly steady reading

Last edited by exploderjoe; Mar 14, 2007 at 11:00 PM.

Mar 15, 2007 | 12:24 AM

LxMan1

Moderator

Joined: Dec 2001

Posts: 22,436

Likes: 17

From: Louisville,Ky.

Pull the spark plugs and see how they look. Black from too rich or white from too lean.

Mar 15, 2007 | 06:53 AM

exploderjoe

Thread Starter

New User

Joined: Nov 2006

Posts: 11

Likes: 0

they are white

Mar 15, 2007 | 07:12 AM

LxMan1

Moderator

Joined: Dec 2001

Posts: 22,436

Likes: 17

From: Louisville,Ky.

Try stepping up to 65 jets.

Mar 18, 2007 | 12:41 AM

kermmydog

Post Fiend

Joined: Oct 2003

Posts: 9,176

Likes: 4

From: Western Central NV

You are aware that the reverse idle carbs adjust the opposite of a regular Holley. The adjustment screws adjust bleed air rather than fuel. When you turn the screws in you richen mixture.
I assume you already knew this. I just thought I would mention it in case you didn't.