Hey everyone. just curious, I am going to be upgrading my old intake and carb on my 75 f250 camper special 460ci. I was thinking about a weiand stealth dual plane with an edelbrock carb combo. the only mods on this motor is a mild towing cam and duall exhaust. It is my daily driver-small trailer puller. would this be a good set up. and what size carb should i go with. I dont want to overcarb. It does not have to be edelbrock carb either. Thank you for any input. mark

 

I have a 77 F250 with a fresh 460 in it. I got a Weiand stealth intake and reused the existing Edelbrock 600 carb. I have about 300 miles on it so far and it runs great. I may go to a 750 carb in the future. According to the Tips section in Summit Racings catalog, this is the formula used to figure carb size:
engine displacement(CID) x max RPM divided by 3456 = ideal carb size.

I figured a 460 at 5k max RPM and came up with 665. That's why I'm leaning toward a 750 CFM carb. Hope that helps.

 

The part of the formula you missed is the 80% volumic effiencey part. Which turns your 665 into a 535 CFM carb. Over carburation is the biggest mistake most do-it-yourselfers make. An RV cam is not gonna wanr to do 5000 rpm.

 

Correct, street engines are about 80% VE while race motors can reach 100%. My cam will not see 5k RPM very often but I just used the number for the formula as the redline is 5200 RPM.

 

hi, with your engine i would use a smaller dual plane manifold more suited to low RPM than the H/Perf stealth and maybe up to a 700 CFM carb vac/sec

 

A 700 is too much for a street/towing rig. Stick with the 600 for better low end throttle responce, torque and fuel econnomy. For his purposes the stock intake will do as well as the more expensive aftermarket intake.

 

I recently swapped out an Edelbrock 600 cfm for a edelbrock 750 cfm I had on my FE 410. Putting on the larger carb made a world of difference. The 600 cfm starved the 460 of fuel. I get better mileage with the 750.

 

With the stock cam the 600 is more than enough and the 750 is overkill with loses in low end throttle response and fuel economy (which is bad enough without hurting it worse). Please supply the numbers from the time slips from the race track where you tested your claim. Please don't use the totally bogus "I can feel the difference in the seat of my pants from the driver's seat." As your butt is not a calibrated test instrument and means nothing. How high are you revving this 460 of yours anyway?

 

I've got a '77 F250 Camper Special, regular cab, fresh 472 (460 +.060) Fuelie pistons, D3 heads, Cam 214/224 - .295/.310 @ .050 - 107/117 CL (never sees the high side of 5000rpm) and I use an Edelbrock Performer 460 intake and Edelbrock 750 carb. Tried a 600 on it to start with, but I like the 750 better....more torque...as good, if not better mileage, IF you dont floor it all the time. The 600 seemed to "lag" a bit on tip-in acceleration, but was OK. Like I say, I just like the 750's "feel" better.

"Your mileage may vary...."

 

I will agree with bear on the quote of right out of the box and it runs not being the case. I just put a 600 edelbrock on my 86 f350 460 and had the two adjustment screws on the front out of adjustment and it made my truck run like crap. easy fix though. After some adjustments truck runs good. Mine is a stock set up.

 

On my 88 E350 with a swapped in 87 460 I used a Holley 750 om top of a Stealth intake. I put in a straight up timing set. That was all I did to the supposedly 80,000 mile wrecking yard engine I bought for 1000.00 delivered to my door from Ranch Ford parts. I don't have much other 460 experience but I can tell you it will idle down to 500 rpm with ease and when you stomp it from a dead idle it will scratch the 285/75-16's for about 50' in my 7500 pound van. It drives like it is injected and will pull 16,000 pounds up the steepest grades at 65mph if you want too. I think a 750 is the ideal size for a stock to mild 460.

On the dyno my 357" Chevy picked up a solid 20 horsepower and a few foot pounds of torque going from a race prepped 750 to race prepped 1100 cfm Dominator. The increase was all across the range from 5500 to 8300 rpm. The throttle response and low speed drivability improved over the 4 other carb I have run. It gets right on the converter razor sharp and never hesitates. I have dynoed 4 carbs on this engine and the Dominators all made more power than the regular 4 barrels. I am the current MPH record holder in my drag race catagory.

 

OK... I recently purchased a 1978 f250 4x4 supercab camper special (not that all of this matters) with a nearly stock rebuilt 460. I purchased the truck in Northern Washington and drove it home to southern oregon. What a slug over the numerous mountain passes. It is a 74 motor out od LTD, or someting and I know little more than that. It was rebuilt 20,000 ago to stock with Edelbrock Plus cam and silv-o-lite dish slugs - lo po retard. Anyhow, with just a switch or carb from the "new" 600 Edelbrock to the 750 elec chock I had on my FE 410 (not an engine expert, but learned how to wake up an FE... love my 410) woke this guy up. I plan on new timing gear and further later, but I think 600 cfm is too small for a 460. Of course I have non of the experience of guys like Bear 45/70 although my guns shoot better from much farther away.

 

I had a 360 FE, and re-ringed it, got a towing/rv cam from napa, hedmans, and an edelbrock performer intake and 750 manual secondary carb. Quite awhile later I tried out a vaccuum 650 Holley, and man, was that a dissapointment. Both were tuned as best as I could get it, and the FE ran fine with both, but the power and responsiveness of the 750 was a major step from the 650.

I would think having an extra 100 cubes would definately call for the larger carb.

 

Both carbs were to big anyway and the mechanical secondaries just fool you butt into thinking they are better due to the massive stumble when you crack the throttle. I also think that if the 650 wasn't better than the 750, your tunning skills are lacking in the carb department if not overall. A bigger carb rarely helps performance, especially when you were to big to start with. Don't any of you people ever listen to what the carb manufactures have to say? Big carbs are great on race motors and are the scurge of street engine, especially in a truck.

 

When I was 16 the first engine I ever rebuilt was a Chevy 327. I built it to the factory 350 horse 327 spec. I started out with a 600 vac carb and it seemed fine but when I switched it to the 750 double pumper it seemed twice as strong.

Later I had a 72 Challenger with a 318. I put an 340 intake and factory carb on it and it ran really well. I soon put a 750 on it and it would lay twice as long of burnout as it would with the stock four barrel. It pulled better off the bottom and made a 130 mph car a 140mph car.

A few years later I had a friend with a nice Mustang with a Boss 351 in it. I put one of my race 1050s on it for an experiment. That turned that car into a beast. It was a 4 speed car. He thought it was a little soggy punching it wide open right off idle but once it hit 2500 rpm it came alive.

I'm a firm believer the 460 likes bigger verses smaller.