Been doin some reading..
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
The secondary metering block on some Holleys can be changed but if one is going to go to that trouble, one might as well get metering blocks with changeable jets or a model carb that has secondary metering blocks with changeable secondary jets.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
This is my opinion, but a 600 CFM carburetor is way too big for a straight six. Not only is this carburetor too big for 300 cubic inches, but a straight six does not rev high enough to warrant that much airflow. I am running a 500 CFM Edelbrock on mine. This is about the highest I would go, and I'm still not done tuning it to keep from running too rich.
A 600 CFM carburetor is pretty common on 400's. They have over 30% more displacement, and typically rev higher. A 300 is a low-spinning stump puller by design, and a good one at that.
Postmaster
Joined: Mar 2005
Posts: 2,949
Likes: 6
From: Earth
That 600 Edelbrock may be spot on right out of the box. I've been tuning and mapping the 500 on my truck now and contrary to what I thought going in looks like it needs to run a little richer.
Drive it before you even think about changing anything. If there are no stumbles or flat spots just leave it. If there are it's probably too lean. The manual has good instructions on how to tune the carb if it needs it.
Any pinging might be cleared up by adjusting or changing the vacuum advance can. It should only show up at cruise or slight acceleration from cruise. The replacement can I on my dizzy only advances timing ~10 degrees at full vacuum, less than I've seen from some others.
Drive it before you even think about changing anything. If there are no stumbles or flat spots just leave it. If there are it's probably too lean. The manual has good instructions on how to tune the carb if it needs it.
Any pinging might be cleared up by adjusting or changing the vacuum advance can. It should only show up at cruise or slight acceleration from cruise. The replacement can I on my dizzy only advances timing ~10 degrees at full vacuum, less than I've seen from some others.
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Laughing Gas
Joined: Aug 2011
Posts: 1,116
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Well..I bought my eddy used..I was trying and hoping for a 500 but could never find the numbers..it I can..ill try to fine an autolite 4100 with the 1.08 size or and eddy 500 cfm..btw..what is the carb model for the 500?
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
Try Google...it can be a good friend. Edelbrock.com - Carburetors & Accessories - Performer Series Carburetors
Lead Driver
Joined: Mar 2008
Posts: 7,195
Likes: 387
From: Near Los Angeles
4100's can be pricey. They often go for $100--$170 on ebay, and still need to be rebuilt.
If you do get a 4100, the 1.08 venturi size, which is 480 cfm, there is some information you need. Ford put the 1.08 on big and small blocks alike--on big blocks for smog reasons. The two models were calibrated differently. What you want originally came on a 289.
Good luck. k
If you do get a 4100, the 1.08 venturi size, which is 480 cfm, there is some information you need. Ford put the 1.08 on big and small blocks alike--on big blocks for smog reasons. The two models were calibrated differently. What you want originally came on a 289.
Good luck. k
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Laughing Gas
Joined: Aug 2011
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I'll keep my eyes and ears peeled for a 4100. If not, i'll look at other carbs, been tinkering with some spreadbores. Anyways, about the spark-knock and pinging. I know I can get the distributor recurved at a local speed shop, but wouldn't all I have to do (If I have any problems) is set the timing, advance where I want it using the static timing method, if it knocks, turn the cap the other way?
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