4bbl carb on flathead?
- Thread starter Flathead man2
- Start date
Richard in Florida
Well-known member
The 1403 is electric choke, and the 1404 is manual choke.
From the Edelbrock web site:
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34PKUP
Well-known member
Picky, Picky, Picky- I have a 1404 with an electric choke. Does that make it a 1403 ? For that matter if I have a 1403 with no electric choke, does that make it a 1404 ?
AnthonyG
Well-known member
I went through the same research process when contemplating a 3 x 2 set up. The score on my post was about the same as this thread indicates.
1 - 3x2 has the biggest cool factor but also the biggest PIA factor setting up.
2 - Close to the same cool factor but much easier set up 2 X 2 either 94's or Stom's .
3 - Edelbrock great for the 4 barrel set up in the 500 cfm if your Flatty is modified a bit to take the higher cfm.
4 - Holley 390 for closer to stock engine lower cfm works better.
Mine is a medium modified 8BA and I was running an Edelbrock 500cfm and it ran great. I still have it and will use again in the future I suspect. For a little more cool factor I have tried a 4 barrel to 2x2 adapter from Speedway and went with the 2x2 with 94's. This setup with direct linkage was an easy set up and runs well. Wasn't sure about using the adapter but it runs great and lets carbs sit extra high which is a great look also.
1 - 3x2 has the biggest cool factor but also the biggest PIA factor setting up.
2 - Close to the same cool factor but much easier set up 2 X 2 either 94's or Stom's .
3 - Edelbrock great for the 4 barrel set up in the 500 cfm if your Flatty is modified a bit to take the higher cfm.
4 - Holley 390 for closer to stock engine lower cfm works better.
Mine is a medium modified 8BA and I was running an Edelbrock 500cfm and it ran great. I still have it and will use again in the future I suspect. For a little more cool factor I have tried a 4 barrel to 2x2 adapter from Speedway and went with the 2x2 with 94's. This setup with direct linkage was an easy set up and runs well. Wasn't sure about using the adapter but it runs great and lets carbs sit extra high which is a great look also.
On your combo what pri. rods/jets/springs and secondary jets worked for you?
Thanks
boogie
37pickupproject
Member
How does your ignition curve compare to a stock distributor? How much timing are you running?
I'm going for a speedway intake and edelbrock 4 bbl for my 296ci. I was thinking of sending my crab to Bubba to have it rebuilt and converted to 12v electronic. What do you suggest I do for igntion?
GreenMonster48
Well-known member
They used set up #11 in the manual. .083 jets and the metering rods that came with the carb. I used this same set up on the flathead in my avatar and it's working great. I ordered the whole jet/spring kit, but you might be able to get away with just ordering the jets.
Jim,
The 390 cfm Holley is purely aftermarket I believe, so no original application.
Can't say for definite, just from vague memory.
It is in my opinion a tad on the small side even for stock flatheads. The 465 cfm seems ideal. If you haven't got it, get JWL's book. This will give you the dyno numbers.
Given the choice of 390 Holley or 500 edelbrock, I'd go with the edelbrock. Can't argue with Richard's findings.
Martin.
The 390 cfm Holley is purely aftermarket I believe, so no original application.
Can't say for definite, just from vague memory.
It is in my opinion a tad on the small side even for stock flatheads. The 465 cfm seems ideal. If you haven't got it, get JWL's book. This will give you the dyno numbers.
Given the choice of 390 Holley or 500 edelbrock, I'd go with the edelbrock. Can't argue with Richard's findings.
Martin.
Anyone have experience running one of Barney's original 4 barrel manifolds with the Holley 390 CFM ? I was looking for one of his original ones because I believe he always had the best designs and casting quality. Did Navarro engineering make a 4 barrel manifold for the 59AB ?
Walt I want a ride, I'll say please if it helps.
38convsedan
Senior Member
I’m considering Edelbrock intake and Edelbrock 500 for my 8BA.
Can you walk me through a how to and components needed?
How are the accelerator and fuel lines modified?
Thanks in advance!
Steve
Can you walk me through a how to and components needed?
How are the accelerator and fuel lines modified?
Thanks in advance!
Steve
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38 coupe
Well-known member
38convsedan, you are running an 8BA yes? Are you currently running the stock distributor and carburetor? If yes, be aware you will also have to change the distributor when you go away from the stock carburetor.
The 500 cfm four barrel is probably larger than your engine will like.
The 500 cfm four barrel is probably larger than your engine will like.
aussie merc
Well-known member
Seems to me that the overriding factor here is carb sizing .Get that right and it all seems to work , its all about air flow thru the carb giving the correct signals cam and compression have some bearing but in the end not that much just need to match air flow with the sweet spot ..
tubman
Well-known member
I think you're right. I had a 390 Holley on a 276" Merc with a MAX-1 cam, and Offenhauser heads about 25 years ago. it seemed about right. I just wish I knew then what I know today. I'll bet it would have been even better.
A couple of years ago, I tried adaping a Quadrajet from a 3.6 liter Buick V6 to a 258 ci Flathead, that also had heads and a MAX-1. It did not work at all. I think it was the disparity between the size of the throttle bores on the Q-Jet to those on the Sharp 4-BBL manifold I was using. It was so bad that I abandoned he project almost immediately before I ruined a fresh engine.
A couple of years ago, I tried adaping a Quadrajet from a 3.6 liter Buick V6 to a 258 ci Flathead, that also had heads and a MAX-1. It did not work at all. I think it was the disparity between the size of the throttle bores on the Q-Jet to those on the Sharp 4-BBL manifold I was using. It was so bad that I abandoned he project almost immediately before I ruined a fresh engine.
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38convsedan
Senior Member
38 Coupe,
Yes…I’m running an 8BA..
In reviewing posts on the subject it looks like there are 390 and 500 schools of thought.
Those in the 500 camp comment on ease of tuning…
I understand the 4 bbl will require an updated dizzy..,
Yes…I’m running an 8BA..
In reviewing posts on the subject it looks like there are 390 and 500 schools of thought.
Those in the 500 camp comment on ease of tuning…
I understand the 4 bbl will require an updated dizzy..,