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View Full Version : Buying a new carb NEED ADVICE


will300
03-03-2011, 08:06 PM
I am going to purchase a new carb for my 87 mc 351 ford. Everyone tells me to go with 4160 holley which looks great. But what is the difference between the 750cfm 4160 and the 600 cfm 4160? The 600 cfm is more expensive. Which one should i go with. Do i need a new lower intake if i go with the 750cfm 4160?

CantRepeat
03-03-2011, 08:18 PM
Well, I do not believe your 351 needs a 750cfm unless the engine is "highly" modified. Chances are if you are running a stock engine you are going to run it very, very rich.

What ever the added cost it will be more then worth it to you.

thatsmrmastercraft
03-03-2011, 08:26 PM
Good advice from CantRepeat. Replace the 600 cfm Holley with the same thing. If you have replaced the heads with GT40 heads and replaced the intake with a more efficient model, you could flow enough air to make the change to the 750 cfm necessary. Without those modifications, you would have problems. Definitely not the place to economize. Make sure to replace both the carb base gasket and the gasket between the spacer and the manifold. Good luck.

east tx skier
03-03-2011, 08:44 PM
Even with the GT-40 heads and better intake, I still ran the 600 cfm Holley 4160 with wonderful performance.

thatsmrmastercraft
03-03-2011, 08:58 PM
Even with the GT-40 heads and better intake, I still ran the 600 cfm Holley 4160 with wonderful performance.

No question the 600 would work well as you had it, you just would have had the opportunity for more horsepower with a move to the larger carb. Always better to have a little smaller carb than too large.

WilliM1940
03-03-2011, 10:04 PM
If you have the old carb, buy an overhaul kit and some floats, it's not that difficult. Just a pain in the a$$ to set the floats on the marine version. The 600 is sized right to the engine, at 4500 rpm you will only be sucking 458 cubic feet per min of air in the 351, normally aspirated.

j.mccreight@hotmail.com
03-03-2011, 10:31 PM
I second the rebuilding, fairly easy did mine last year works like a champ 50 bucks for kit and put the rest you were going to spend on a new carb towards gas money this summer :D

americanskierJim
03-03-2011, 10:33 PM
Here is a place to buy your rebuild kit. I bought one and still have it on my work bench. Hope this helps you out.



http://allstatecarburetor.com/detail.php?pid=512&mfgn=1&ctgn=6&stt=5&gb=2

thatsmrmastercraft
03-03-2011, 10:42 PM
If you go the rebuild route, it is worthwhile to use an agitator while soaking the carb. That will help ensure you have all the gunk cleaned out before it all goes back together. Rebuilt plenty of Holley carbs over the years. Not too much to it.

Jeff Lyman
03-03-2011, 10:55 PM
Agree with all above. Last summer I rebuilt the old 4010 on my 351 with great success. No premature shut downs any more. HINT... I tested over and over and found the fuel bowl levels had to be kept very high close to the point of overflow. For what its worth.... alot cheaper than a new one.

Peter cant wait to see my new Dubs!

thatsmrmastercraft
03-03-2011, 11:06 PM
Agree with all above. Last summer I rebuilt the old 4010 on my 351 with great success. No premature shut downs any more. HINT... I tested over and over and found the fuel bowl levels had to be kept very high close to the point of overflow. For what its worth.... alot cheaper than a new one.

Peter cant wait to see my new Dubs!

Good point about the fuel levels. While the settings seem kind of crude, it is important to be spot on. The 4160 seems to be more forgiving.

Jeff, they are on the way! :cool: