Carburetor suggestions
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Senior User
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From: Masontown, WV
Carburetor suggestions
My stock 2150 carb is getting in bad shape. I want to upgrade to a better carb and wanted to get some input. I use my truck mainly to haul firewood and to tow cars on a trailer. The truck will pull great at anything below 3 grand but it won’t go any higher while towing up hill. I thought about installing a Holley 500cfm to save some money. The engine is a 400 with about 6000 miles on it. It has an rv cam, headers, 351c 2v heads standard pistons 30 over.
Thanks
Gregg
Thanks
Gregg
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Joined: Aug 2001
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From: Delaware
An Edelbrock #1406 (600CFM) with an Edelbrock Performer EGR intake should help.
The RV cam might be holding you back. The Torque could be falling off above 3000 RPM, but it could be the right choice for pulling a load at lower RPM.
The headers should help, but some porting work on the exhaust port will do more.
The RV cam might be holding you back. The Torque could be falling off above 3000 RPM, but it could be the right choice for pulling a load at lower RPM.
The headers should help, but some porting work on the exhaust port will do more.
Posting Guru
Joined: Dec 2002
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From: chicago burbs
if towtruck has the original heads, or D5 or later heads, you can't do any good by porting them. i went way too far out of my way and payed way too much for a set of D5's. the exhaust port is choked as-cast. nothing you can do. it's 1/2 way full right up to the top of the valve guide boss in the port, it's a water jacket. the only fix is a set of pre '75 heads, before the water jacket filled exhaust port. i can't imagine that a 4bbl carb would help much either with those heads? i ended up swapping the valves from the D5's into a set of early castings. bare D5's for sale, with a bag of parts.
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From: Masontown, WV
Maybe the cam?.... I thought this also but I read somewhere the stock carb is only good for 350 cfm, that’s why I thought it was holding me back. If I did the math right, I run out of air at around 3 grand, that’s why I was going the 500 cfm carb route. Am I right about this?
The heads are from a 71 351c 2v so I could probably do some work to them to get better flow.
As I write this though, my old carb has probably leaked out enough fuel to buy my lunch tomorrow.
The heads are from a 71 351c 2v so I could probably do some work to them to get better flow.
As I write this though, my old carb has probably leaked out enough fuel to buy my lunch tomorrow.
Posting Guru
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From: chicago burbs
good news on the heads then, a little porting can do wonders. do you know any more about the cam in the engine other than it being an "RV" cam? are you sure your distributor is working properly, vacuum and centrifugal? what is your total timing? leaking fuel can't be a real good thing, leaking from where? 2bbl and 4bbl cfm ratings don't directly correspond, they are measured by different standards. doesn't make sense to me either? a 400 should be able to pull a freight train and never give up!
Last edited by grclark351; Nov 29, 2005 at 11:42 PM.
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From: Delaware
If you post the cam specs, I'll run a simulation on Dyno Sim.
If you change manifolds, get the EGR version, or else you will need to recurve the distributor.
If you change manifolds, get the EGR version, or else you will need to recurve the distributor.
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From: chicago burbs
about that carb then, have you looked at a holley 7508-1? it may require a little tuning. your stock carb in good order should run the truck up the hill no problem though, i'd just rebuild the stock one if you think that'll take care of it? converting to a 4bbl manifold and carb presents it's own issues that you may or may not want to tackle. if there is something holding your engine back from being all that it wants to be, adding new parts will only add to the list of suspected problems. i'd just kit the carb and see what happens from there.
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From: Masontown, WV
Thanks for all the replies. I think I had a misunderstanding of how a carburetor affected engine rpm. I thought at some point the engine would run out of air and not let it spin any faster under load due to the restriction of air movement. This is why I thought 3 grand was about it for my 400 with the carb I have. Now I see it is also many other factors. You guys are right about its pulling power. At 2500 rpm I could pull just about anything that wont tear my truck in half. Its just 2500 rpm is 55 mph with my gearing and I hate to be 15 mph below the speed limit up hill.
Danlee, I’ll see if I can get the specs on the cam. It’d be nice to know what kind of numbers I should be getting. Thanks. EGR intake and recurving the distributor I know I should remember this but can you help me out?
Danlee, I’ll see if I can get the specs on the cam. It’d be nice to know what kind of numbers I should be getting. Thanks. EGR intake and recurving the distributor I know I should remember this but can you help me out?
Last edited by towtruck; Nov 30, 2005 at 09:24 PM.
Fleet Mechanic
Joined: Jan 2003
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From: Central Ohio
I did notice on my Bronco when I first got it the engine seemed as though it weezed out much above 3000 rpm or even 2500 for that matter. I did some bolt ons, carb, intake, and headers and the difference in the engine breathing is phenomonal. Even with the stock cam it likes to rev high. And the speed at which it can rev is much faster. I figured the stock intake or carb must really be chocking its breathing. I do want to put a new cam in it soon but I have never done a cam before so I did the easy stuff first.
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