Carburetor Choices HELP ??

[Twinibeam66]

Hey everybody wanted to ask whats the best carb for this engine ??  FE 416   bore 4.080 stroke 3.98  Barry's Felony Heads   Comp Cam  Duration @ 50  243  251        Lift 638  643    Mahle pistons should be close to 10-1 Brent's new rockers and smith brothers push rods  Howards roller lifters   RPM intake   Melling HV pump  Canton windage tray and Milodon Oil Pan stock.  Now i rebuild a Holley 750 but not sure if its big enough its several years old and dont want to leave any HP on the table also i was reading on here a lot guys are running 850 or 950 or bigger, i have no experience with this so all help is appreciated . This engine is going in 1966 F100 that will be drove less that 3000 miles a year just a weekend deal.   

Many Thanks
Twinibeam66

 

[Drew Pojedinec]

Considering the usage, I doubt the extra ten hp at the top end would be worth a carb swap.

[338Raptor]

750 is plenty big enough.

[Falcon67]

Echo - decent 750 will be plenty.  If it's been a good carb, keep it. 

[wayne]

Find a 3310-1 780 one of the best holley made most times ebay will have one for sale.Some will have a gm number also they came new on 396-375hp.

[Twinibeam66]

Thanks everybody , hey Drew Pojedinec  the 750 i got somebody had changed the jets in it before i got it and im not sure what they should be ?? i put a 69 in the front and a 72 in the rear and a 4.5 power valve but i think the power valve should have been a 6.5 ?  what would be a good jet size for this ?

Many Thanks

[e philpott]

Currently 2x4's with my 416 but when I run a single four I use my Joe C ported Dove Spider with a Holley HP 950 with annular boosters , ran it on street for over 15 years and still have it , my car is 3800 with me in it C6 when automatic , wide ratio big in big out 4 speed currently

[Joe-JDC]

An alternative for your engine if you don't drive it every day would be the Summit 750 carb.  It is fairly inexpensive, does not leak like the Holley, and makes just about the exact same horsepower as any Holley 750.  I have done dyno testing with both, and for a street driven vehicle that gets driven only on weekends, or a couple days a week, I definitely would suggest the Summit 750.  JMO, and I do like Holleys, but I also hate to have to refill and prime them every time I go to start it after a week or two.  Joe-JDC

[Rory428]

Another vote for a 780 vacuum secondary Holley 3310-1. I have ran them on 390s, 428s, and my 427 with 428 crank engine in my Fairmont. When I had the 428 in the Fairmont before, I tried a number of larger carbs (800&850 double pumpers, 950 HP, 830 annular, 950 &1050 "3 barrels", and a 1050 Dominator, they all ran in the low 10 second range, but none of them went any quicker than the 3310-1. That same 780 vac is the same carb that ran 9.9 ETs on my 427/454.

[Thumperbird]

My only contribution to this discussion, which was learned the hard way after great info. from guys on this sight, check the dang butterflies for nice and smooth open and close behavior, equal t slot position, turn it into a fine mechanism as compared to the off the shelf stamped hardware rough acting mechanism.

[Drew Pojedinec]

Normal 3310 based 750 will have a 72 main jet
Really 68-72 is in the range for the primary.
Secondary will be 76-82 if there is no power valve. 3310 has a much larger secondary venturi than primary. Can’t speak for every 750 out there.
Same with 3310’s on their own.... EH vs -1, vs later ones are all different in calibration.
Anyway, that is the range for jets, you really need to drive and see to get it perfect.
Same with power valve opening point.

Maybe I am wrong, but it seems larger carbs almost always make bigger dyno numbers. Thus the rampant use of larger carbs on a dyno test.
This doesn’t always translate to faster or better at the track or on the street.
Hard to generalize

[Falcon67]

True from Drew.  Everybody will tell you to put a 750 on a 351C.  My old 650DP does the same ET/MPH as a tuned QF 750 (about 800~840 CFM real world).  A decent "3310" or an older 3310 updated with a QF main body, or other makes a decent all around unit once sorted.  Key thing is to get the list number and set it back to stock jetting per Holley specs, then tune from there.  Most are real close out of the box.  I had a basic 3310 vacuum secondary with a ProForm body that I loaned to a guy with a big 9:1 454 in a Firebird race car.  Used to run a blower, he pulled that off and put on a single plane and an 850DP.  Had carb issues at the track one night so I loaned him the 750.  His car picked up a full second in the 1/8 mile.  I like to never got that carb back.

Also agree with Joe - the Summit carbs are the old Holley 4010/4011 line.  I used one in the way back, mild 351C 4V, 9.5:1 with a big Weiand single plane intake.  Ran great street/strip, nice street manners.  Boosters look like the old Ford 4100 style carbs.  Holley gave them up likely because "that don't look like no Holley to me".  Hard sell for them. 

A good carb is like a good converter - you don't let it go.  If you don't need it right now for something, you preserve it and put it away nicely for that time when you do need it LOL. 

[427LX]

Hey everybody wanted to ask whats the best carb for this engine ??  FE 416   bore 4.080 stroke 3.98  Barry's Felony Heads   Comp Cam  Duration @ 50  243  251        Lift 638  643    Mahle pistons should be close to 10-1 Brent's new rockers and smith brothers push rods  Howards roller lifters   RPM intake   Melling HV pump  Canton windage tray and Milodon Oil Pan stock.  Now i rebuild a Holley 750 but not sure if its big enough its several years old and dont want to leave any HP on the table also i was reading on here a lot guys are running 850 or 950 or bigger, i have no experience with this so all help is appreciated . This engine is going in 1966 F100 that will be drove less that 3000 miles a year just a weekend deal.   

Many Thanks
Twinibeam66

If just cruising the streets a 750 should be fine. What gear and trans in your truck?
That's a good bit of cam for low end/mid range torque for truck use.

[Twinibeam66]

427LX  I just put a 370 posi gear in the truck, right now it has 3 on the tree with overdrive. But later on im going to put a TKO 600 transmission in it.  Thanks for the reply

[Twinibeam66]

Thanks Everybody for the help really appreciate it .  Great Forum