351 carb recommendations

[abomb]

Looking for suggestions, carbs are not in my wheel house. Car is a 95 grand marquis, 4.56 rear, Hydraulic Tappet
RPM Range
1500 - 5200
Intake Valve Lift
0.477
Exhaust Valve Lift
0.477
Advertised Intake Duration
292
Advertised Exhaust Duration
292
Intake Duration @ .050
214
Exhaust Duration @ .050

214
Lobe Separation (degrees)
110
Aluminum intake and aluminum 210cc heads. No clue what kind of power the motor will be making. I've heard local guys suggest carter 625cfm up to a 750 double pumper but I'm interested in advice from guys that have experience with carb set ups on dirt.

[jugulator]

whats wrong with a holley 500 ?

[klicky96]

Holley 500 or edelbrock 1406

[abomb]

Oct 5, 2016 13:52:46 GMT -5 jugulator said:

whats wrong with a holley 500 ?

Absolutely nothing, it just wasn't suggested to me.

[redneckracing12]

Yep like stated. Holley 4412 gets my vote.

[fordpowerforever]

holley 500 is something every derby driver should have at least one of. works on 99% of applications.

[redneckracing12]

If you don't want to spend the $$$ on a holley pick up a motorcraft 2 barrel. They are a diamond dozen. Stay away from the 1.08 and 1.14 for your application. Look for the 1.21 and 1.33. I have 2 4412's and 5 motorcrafts. Can never have enough carbs lol.

[abomb]

Oct 6, 2016 20:26:17 GMT -5 redneckracing12 said:

If you don't want to spend the $$$ on a holley pick up a motorcraft 2 barrel. They are a diamond dozen. Stay away from the 1.08 and 1.14 for your application. Look for the 1.21 and 1.33. I have 2 4412's and 5 motorcrafts. Can never have enough carbs lol.

IS a 2bbl or even a 500 cfm carb enough for a heads/cam 351?

[redneckracing12]

For derby application yes.

[klicky96]

You don't want to throw a huge carb on it, even though it's got work done to it. Everyone thinks that if you are dumping more fuel, you are making more power. Well, that doesn't work in derby application. In this sport, you need to worry more about keeping that engine running when it's at 280+ degrees.

[abomb]

Oct 8, 2016 16:22:44 GMT -5 klicky96 said:

You don't want to throw a huge carb on it, even though it's got work done to it. Everyone thinks that if you are dumping more fuel, you are making more power. Well, that doesn't work in derby application. In this sport, you need to worry more about keeping that engine running when it's at 280+ degrees.

That's makes sense, I do heat races with the car though not straight on derby.

[rhull1977]

I know there is a difference between dirt track and derbies but there are plenty of high horsepower dirt track motors with 2v carbs. Don't underestimate a 4412 even on a built motor.

[abomb]

Oct 9, 2016 13:42:57 GMT -5 rhull1977 said:

I know there is a difference between dirt track and derbies but there are plenty of high horsepower dirt track motors with 2v carbs. Don't underestimate a 4412 even on a built motor.

For sure, I'm doing research on the recommendations you guys are making while waiting for all my other parts to show up. I assume I will want to run a manual choke carb to eliminate any issues an electric choke could cause?

[klicky96]

I don't run chokes period. I remove the butterfly(s). Never had an issue. Obviously, if you are running it in a below freezing environment often, I would get a manual choke. But if it's strictly for race purposes, I wouldn't worry. I don't have a problem getting my engines to start in the winter, couple extra pumps of the pedal, fire it up, and hold it at about 1500rpm for a little bit and she's good.

[JR/77x]

4412s are plentiful too at swap meets and hot rod shows find at least one every year that's pretty clean for under 75 bucks that's the least I can say