Moparts
440 falls off at 5 grand...Stumped
Posted By: stinger
440 falls off at 5 grand...Stumped - 07/22/13 02:16 AM
I have a 440 in a e bod,lunati 303 cam,worked 452 heads,391 rear auto.
has 3/8 sender,fuel line,eddy mech. pump,eddy rpm intake,850 holly dbl. pumper msd 6a ign.,headers,2 1/2" exhaust. runs like a champ and falls apart just a tic past 5 grand. I've tried jetting,timing,fuel pumps,no air cleaner,gas cap,2 different dizzy's all with the exact same results.
I would think it should pull past 5 grand but cant figure what's hanging it up. seems to be fuel but plugs are a nice tan color.
Any idea's??? I'm stumped.
Posted By: DAYCLONA
Re: 440 falls off at 5 grand...Stumped - 07/22/13 02:23 AM
Posted By: Dodgem
Re: 440 falls off at 5 grand...Stumped - 07/22/13 02:24 AM
May be running out of fuel. run it up to 4800 let off completely then back to the boards if it then pulls up to say 5500 then you know your fuel is not keeping up!
Posted By: Dodgem
Re: 440 falls off at 5 grand...Stumped - 07/22/13 02:27 AM
Quote:
Not knowing whether you've performed the mods to the car, or purchased it that way?....but any chance the MSD may have a 5000 RPM rev chip limiter? 
Oh yea try different chips if it as a limiter.
The other thing that can cause that is too much preload on the lifters and it pumping open. you can try taking a 1/2 turn at a time out of adjusters to see what it does don't be afraid of a little ticking!
Are the heads milled and or block decked much?
Posted By: lewtot184
Re: 440 falls off at 5 grand...Stumped - 07/22/13 02:29 AM
i've got a stock 440 magnum that drops dead at 4500,...
.
Posted By: stinger
Re: 440 falls off at 5 grand...Stumped - 07/22/13 02:36 AM
heads been cc'd to 85 so a little cut,can see the numbers shaved a little bit. no rev limiter. didn't think of backing out and hitting it again but will try. just running stock rockers for now.
I did not build the engine so not much help there.
maybe a set of rocker shaft shims???
Posted By: RapidRobert
Re: 440 falls off at 5 grand...Stumped - 07/22/13 03:10 AM
As you know I'd want to pin it to fuel or ign first. Sounds like you have a killer fuel delivery system but I'd T at the carb inlet & run a neoprene line to a vac gauge with a psi side & tape it to the windshield & need several psi at the offending rpm/load. since you've been dealing with this for awhile I'd go ahead & go to the trouble of subbing in a regular electronic ign & see what happens. Is rotor phasing close enough? NAPA has an Echlin rotor with a .060" longer blade that doesn't fix phasing but helps it as it reduces the distance the spark has to jump. MO-3000 for $8 dollars & change out the door. As said check preload. I'm gonna WAG that it is the Might Sputter & Die system. Holler how it goes.
Posted By: strokerchall
Re: 440 falls off at 5 grand...Stumped - 07/22/13 03:28 AM
do you have a carb spacer?
maybe the fuel is boiling?
Posted By: stinger
Re: 440 falls off at 5 grand...Stumped - 07/22/13 03:58 AM
Quote:
do you have a carb spacer?
maybe the fuel is boiling?
no and doudt it.
don't think its pre load or pump up.engine runs great until the 5 grand mark and after it falls flat.
Posted By: TheBlueBeast
Re: 440 falls off at 5 grand...Stumped - 07/22/13 04:21 AM
Quote:
May be running out of fuel. run it up to 4800 let off completely then back to the boards if it then pulls up to say 5500 then you know your fuel is not keeping up!
I had a 383 that did this. the pump push rod was worn and when i replaced it the problem vanished.
Posted By: stumpy
Re: 440 falls off at 5 grand...Stumped - 07/22/13 04:30 AM
I have had a bad coil cause this kind of trouble.
Posted By: Jim_Lusk
Re: 440 falls off at 5 grand...Stumped - 07/22/13 06:11 AM
Cam timing? My son had a 2.2/TII that was a tooth off on the cam sprocket. Engine ran GREAT except above 5,000 or so.
Posted By: Sinitro
Re: 440 falls off at 5 grand...Stumped - 07/22/13 07:22 AM
Obviously you have hydraulic lifters..
If original Mopar OE stockers 5K or a little over is all you will get...
Just my $0.02...
Posted By: gdonovan
Re: 440 falls off at 5 grand...Stumped - 07/22/13 11:06 AM
Don't overlook valve springs.
Posted By: Dodgem
Re: 440 falls off at 5 grand...Stumped - 07/22/13 11:12 AM
Shims may help try the fuel test first.
That was the first RPM limiter I ran into back in the day next was valve springs.
Posted By: patrick
Re: 440 falls off at 5 grand...Stumped - 07/22/13 12:52 PM
Quote:
Don't overlook valve springs.
that was my initial thought, as he didn't list what springs....for that fast rate cam, you want a spring probably with at least 120# of seat pressure and a 350lb/in rate
Posted By: DrCharles
Re: 440 falls off at 5 grand...Stumped - 07/22/13 01:16 PM
What happens when you rev it with no load (park/neutral)? If it still won't go past 5k then it's almost certainly not fuel supply
Posted By: Mr.Yuck
Re: 440 falls off at 5 grand...Stumped - 07/22/13 01:17 PM
I'll go with valve springs, if you are running stock rockers and springs it's a wonder it runs at all. Next would be coil although those tend to work until they get hot then they don't work at all. Alsomake sure you are not sucking the choke horn shut.
Posted By: eightlitermopar
Re: 440 falls off at 5 grand...Stumped - 07/22/13 01:34 PM
We had a 383 falling flat like that. It was the fuel pump pushrod. I second or third this opinion. Just looking at the rod you can't tell much of a difference.
I'd change that and see what happens.....
Posted By: gdonovan
Re: 440 falls off at 5 grand...Stumped - 07/22/13 02:23 PM
Quote:
We had a 383 falling flat like that. It was the fuel pump pushrod. I second or third this opinion. Just looking at the rod you can't tell much of a difference.
I'd change that and see what happens.....
p
Hook up a gauge and road test, does not sound like fuel to me though. Light throttle in to 5000 and then roll into it. Should have enough fuel in the bowls for a second or two.
Posted By: 6bblFLASH
Re: 440 falls off at 5 grand...Stumped - 07/22/13 09:11 PM
I would be very interested in a solution too.
I have the same problem on my 440,but have tried almost everything listed and more,3-cams/gears/carbs/ignition-3-of them/exhaust/timing /springs/fuel-pumps/shim-rockers......whats left?
Heads and a lighter car
Posted By: GODSCOUNTRY340
Re: 440 falls off at 5 grand...Stumped - 07/22/13 09:50 PM
Make sure the gas tank vent isn't plugged. Try it with the gas cap either loose or off to verify.
Posted By: stinger
Re: 440 falls off at 5 grand...Stumped - 07/23/13 12:34 AM
remembering back on all the stuff I tried I think it's fuel but will wire the choke open just in case. I bought the heads years ago and forget all the specifics. it has ferra valves,bronze guides,titanium retainers and hemi race springs what ever that means. they are single with dampners.
anywho,when changing jets I could move the falloff point a few rpm's up or down with a performer intake. swaped in an rpm intake and the fall off occoured closer to 4500 rpm so I rejetted and got it back up to about 5200.
I have a question about the fuel pump rod??? when I changed pumps I measured the rod and it's not quite up to 3 1/4",measured with a caliper. the rod is in good shape but came from 440 source. thinking it could be the rod. are these rods exactly 3 1/4"?
I had a 340 with crane cam close to this one with stock valvetrain and a six pack and that thing would spin up to 7 grand. but remembering I did have rhoads lifters in it.
Posted By: ahy
Re: 440 falls off at 5 grand...Stumped - 07/23/13 12:41 AM
Agree with RR an auxiliary gauge on the carb inlet line is an excellent diagnostic. A lot of the things mentioned (fuel pump, pushrod, vapor lock, gas cap) would show up as low fuel pressure. If the fuel pressure holds pretty steady then drops off as you approach 5000 RPM then you have narrowed down the problem. If not, keep looking. Your local AP store should have a suitable gauge. If you were nearby I'd loan you mine.
Posted By: Lefty
Re: 440 falls off at 5 grand...Stumped - 07/23/13 01:09 AM
Lot's of good suggestions. I'd add making sure the throttle plates are fully open with the pedal at WOT. If that's OK, I'd substitute in a different coil.
You didn't say "how" it falls flat. If it's draining the fuel line like in a plugged tank intake they usually just die and then when you back off they start back up in my experience. If the acceleration goes flat with a burble it's the rev limiter kicking in if it cuts individual cylinders. If the limiter is the type that kills all spark it want's to put you through the front window.
Just some more ideas, hope you find it soon...
Posted By: Mr.Yuck
Re: 440 falls off at 5 grand...Stumped - 07/23/13 02:08 AM
Quote:
I would be very interested in a solution too.
I have the same problem on my 440,but have tried almost everything listed and more,3-cams/gears/carbs/ignition-3-of them/exhaust/timing /springs/fuel-pumps/shim-rockers......whats left?
Heads and a lighter car
your blower is too small......
Posted By: stinger
Re: 440 falls off at 5 grand...Stumped - 07/23/13 02:08 AM
Quote:
Lot's of good suggestions. I'd add making sure the throttle plates are fully open with the pedal at WOT. If that's OK, I'd substitute in a different coil.
You didn't say "how" it falls flat. If it's draining the fuel line like in a plugged tank intake they usually just die and then when you back off they start back up in my experience. If the acceleration goes flat with a burble it's the rev limiter kicking in if it cuts individual cylinders. If the limiter is the type that kills all spark it want's to put you through the front window.
Just some more ideas, hope you find it soon...
it sounds like it just starts breaking up with a fast loss of power,let off and its fine. runs great up to 5ooo fine after.idles perfect,starts easy all the time.great running engine other then the 5 grand limit. there is no rev limiter.
the coil is old though,sound like it could be a coil? it's a blaster 2. I thought coils just took a dump and that's that.
Posted By: Mr.Yuck
Re: 440 falls off at 5 grand...Stumped - 07/23/13 02:11 AM
My blaster II is like 10-15 years old. It's been on 4 engines. does it Peter out in the burn out box at 5k? or is it down track?
Posted By: stinger
Re: 440 falls off at 5 grand...Stumped - 07/23/13 02:23 AM
Quote:
My blaster II is like 10-15 years old. It's been on 4 engines. does it Peter out in the burn out box at 5k? or is it down track?
street car so down track 
Posted By: Dodgem
Re: 440 falls off at 5 grand...Stumped - 07/23/13 02:29 AM
If it sounds like it's breaking up fuel supply or valve springs!
Posted By: stinger
Re: 440 falls off at 5 grand...Stumped - 07/23/13 03:52 AM
Quote:
If it sounds like it's breaking up fuel supply or valve springs!
my thoughts as well. I'll do the fuel test in a few days and post my findings.
the spring kit for this cam is cheap and single spring so should be an easy swap if need be.
Thanks All!
Posted By: dennismopar73
Re: 440 falls off at 5 grand...Stumped - 07/23/13 04:22 AM
It will be fuel delivery! either the pump not up to task, or the way the fuel is ran to the carb (s)
Unless the springs have broken the stocker will go past 5500!
Posted By: gdonovan
Re: 440 falls off at 5 grand...Stumped - 07/23/13 10:12 AM
Quote:
It will be fuel delivery! either the pump not up to task, or the way the fuel is ran to the carb (s)
Unless the springs have broken the stocker will go past 5500!
I went through this over well over a decade ago, two different sets of MP springs! All crap. Checked the pressures before and after a weeks run time and was horrified how much they dropped off.
Ended up buying a set of battleship steel springs and taking out the inner spring to get the pressure I wanted. Even after years of use still within spec and the motor has been buzzed hard to 7200 RPM.
Before that it would get to around 5000-5500 and pop and frat like it had a bad misfire from a coil of ignition box.
Check the springs, check the springs, check the springs. Really not that hard to pull two and have them checked.
Ignition wise I ended up using a gold NASCAR box, Blaster II coil, and Moroso spiral core 8mm wires all of which made no difference till I changed springs.
Hell I even indexed the distributor rotor with a clear ignition cap and timing light, still got the cap too.
Posted By: imfixinmopars426
Re: 440 falls off at 5 grand...Stumped - 07/23/13 11:07 AM
are the wires going to the dist correct polarity? I had one without factory plug ins and wired it backward...ran decent to 4-4500 then broke up bad.switched wires,and ran great...just a thought... also on fuel pressure,i would rig a gauge near the carb to see drop in psi...good luck,mike
Posted By: 63stabamatic
Re: 440 falls off at 5 grand...Stumped - 07/23/13 11:34 AM
I also had a 383 that did this, it was the fuel filter.
Posted By: Paul_Fancsali
Re: 440 falls off at 5 grand...Stumped - 07/23/13 02:40 PM
If all the above do not help disconnect the MSD and wire in a point distributor.I had MSD boxes that cost me .3-.4 seconds and finally pulled the crap out and wired it up to points and went faster then I ever had. I realize all out race car like all the toy's limiter etc I just want the time and a reliable car the boxes were fixed twice that's enough for me
Posted By: Sixpak
Re: 440 falls off at 5 grand...Stumped - 07/23/13 03:13 PM
Quote:
Quote:
It will be fuel delivery! either the pump not up to task, or the way the fuel is ran to the carb (s)
Unless the springs have broken the stocker will go past 5500!
I went through this over well over a decade ago, two different sets of MP springs! All crap. Checked the pressures before and after a weeks run time and was horrified how much they dropped off.
Ended up buying a set of battleship steel springs and taking out the inner spring to get the pressure I wanted. Even after years of use still within spec and the motor has been buzzed hard to 7200 RPM.
Before that it would get to around 5000-5500 and pop and frat like it had a bad misfire from a coil of ignition box.
Check the springs, check the springs, check the springs. Really not that hard to pull two and have them checked.
Ignition wise I ended up using a gold NASCAR box, Blaster II coil, and Moroso spiral core 8mm wires all of which made no difference till I changed springs.
Hell I even indexed the distributor rotor with a clear ignition cap and timing light, still got the cap too.
MP springs are junk - you learned the hard way.
Not sure what rockers are on the motor but I had a small block that would break up at 4500. Was running stock non adjustable rockers. Heads and blocked were milled. Hydraulic lifters would pump up at 4500 and cause valve float. Adjustable rockers cured it. I'd start with the valve train - adjustable rockers/valve lash, valve springs, and look at fuel delivery too.
Posted By: dogdays
Re: 440 falls off at 5 grand...Stumped - 07/23/13 05:11 PM
My
:
Valve springs.
R.
Posted By: p d'ro
Re: 440 falls off at 5 grand...Stumped - 07/23/13 07:57 PM
How far is it supposed to pull?
Posted By: beatgoeson
Re: 440 falls off at 5 grand...Stumped - 07/23/13 08:02 PM
Use a factory tach, Mine idles at 2500 and rev's to 9 grand in a second !! LOL
Posted By: dezduster
Re: 440 falls off at 5 grand...Stumped - 07/23/13 09:24 PM
I noticed you have quite a bit of edelbrock stuff on your engine. You didn't specify what timing chain you have but I have seen TWO of the edelbrock chains installed incorrectly due to the dots being vague as to how to align. Both engineers ran ok until 4800 rpm and just wouldn't pull anymore. Sounded like timing and fuel.
Posted By: TJP
Re: 440 falls off at 5 grand...Stumped - 07/24/13 06:20 PM
Silly question, what is the RPM range of the cam???
1. Fuel pressure, easily checked by installing a fuel pressure gauge and making a quick test run. If you're dropping below 6 psi you have to resolve the issue.
2. Try a run without the air cleaner, I got my backside kicked years ago by a big block that had to small of an air cleaner on it. Another similar situation was due to the air cleaner lid being too close to the top of the carb due to hood clearance.
3. Try un corking the motor. A restricted exhaust will drive you nuts. Think, mouse nest, collapsed baffle, heat riser stuck 1/2 shut etc.
4. Valve springs. I am not familiar with the 303 lunati but if it has steep ramps, springs, weak or not will cause the problem. IF that is the culprit it may also be prone to burping gas out of the carb due to the valves floating.(should be apparent with the hood and air cleaner off. One can make a series of test runs to establish the exact RPM that the problem occurs. Install .060 t.125 shims under the springs and repeat the test. IF the RPM moves up you have found the issue.
5. Along shot would be other valve train issues, IE: geometry, rocker arms/ interference, pushrod length etc.
keep us posted
Posted By: dogdays
Re: 440 falls off at 5 grand...Stumped - 07/24/13 06:25 PM
The Lunati 303 is one of the larger of the Voodoo cams, which have quick ramps. That's why I say springs. The OP didn't build the heads himself so he doesn't know what they are.
R.
Posted By: Dave Watt
Re: 440 falls off at 5 grand...Stumped - 07/24/13 06:38 PM
Quote:
and hemi race springs what ever that means. they are single with dampners.
My buddy had those springs on his '68 Pure Stock Hemi, it fell on it's face at 5,300 RPM's, changed to a different spring, now it will go 6,000 no problem.
Posted By: TJP
Re: 440 falls off at 5 grand...Stumped - 07/24/13 08:50 PM
Quote:
The Lunati 303 is one of the larger of the Voodoo cams, which have quick ramps. That's why I say springs. The OP didn't build the heads himself so he doesn't know what they are.
Quick ramps require a stiff spring 
Quote:
Quote:
and hemi race springs what ever that means. they are single with dampners.
My buddy had those springs on his '68 Pure Stock Hemi, it fell on it's face at 5,300 RPM's, changed to a different spring, now it will go 6,000 no problem.
it would appear as though the springs may be the issue, some of the things I suggested earlier are fairly easy things to check and can definitely cause the problem described. if the two above quotes are factual then the springs are probably at fault.
Posted By: stinger
Re: 440 falls off at 5 grand...Stumped - 07/27/13 10:23 PM
I picked up a summit dualfeed line with filter and gauge and a separate line to tape the gauge to the windshield. I got a constant 4 psi with no drop in pressure,engine still falls at 5 grand. I took theline off and installed it to the feed line and get a chatty 6.5 psi. I also replaced the fuel pump rod with a mancini one.
Posted By: RapidRobert
Re: 440 falls off at 5 grand...Stumped - 07/28/13 12:44 AM
Alright it ain't fuel starvation. EDIT got a points or electronic dizzy/system that you can sub in for a test? I feel lucky
Posted By: hp383
Re: 440 falls off at 5 grand...Stumped - 07/28/13 09:16 AM
Quote:
Obviously you have hydraulic lifters..
If original Mopar OE stockers 5K or a little over is all you will get...
Just my $0.02...
My 383 had a 292/509 old school purple shaft with stock springs and rockers, and Summit hyd lifters. It would pull hard up to 7200 and would keep going if I didn't shift or back off.
Previous owner used it for bracket racing and would hold it to 8000 on the shifts.
When I first installed the engine it would fall flat at about 4800-5000, mine ended up being a bad carburetor. I switched from the Holley it came with to a new Eddy 750 and wow, that woke it up.
Latter added the tunnel ram and a second Eddy 750 and I couldn't stop giggling.
But it seems the OP had determined its not a fuel issue.
Posted By: 52savoy
Re: 440 falls off at 5 grand...Stumped - 07/28/13 09:41 AM
Quote:
Quote:
Obviously you have hydraulic lifters..
If original Mopar OE stockers 5K or a little over is all you will get...
Just my $0.02...
My 383 had a 292/509 old school purple shaft with stock springs and rockers, and Summit hyd lifters. It would pull hard up to 7200 and would keep going if I didn't shift or back off.
Previous owner used it for bracket racing and would hold it to 8000 on the shifts.
When I first installed the engine it would fall flat at about 4800-5000, mine ended up being a bad carburetor. I switched from the Holley it came with to a new Eddy 750 and wow, that woke it up.
Latter added the tunnel ram and a second Eddy 750 and I couldn't stop giggling.
But it seems the OP had determined its not a fuel issue.
The usual.. mopar valve spring bashing 
I ran the same set of mopar "purple stripe" springs for 4 seasons, 3 or 4hundred runs. Shifted the Hemi at 6200 and trap rpm was about 7200! oh, rear gear ratio was 5.50 
I still have those spring and they carry the same pressure 35 years later. Also a few more new sets and I compared seat and open pressures on every set. They were indentical.
I guess I bought the only good sets that came out of Performance Parts.
I had a 383 built by Mid West Balancing(Performance Research now) in the early 70s and it would tach over 8,000 with the magnum "red springs". The bad thing is the valves couldn't take it and I broke a few... my bad 
My roadrunner.. same set of MP street Hemi springs since 1988 and its still pulling hard at over 7,000rpm.
Posted By: gdonovan
Re: 440 falls off at 5 grand...Stumped - 07/28/13 11:52 AM
Quote:
The usual.. mopar valve spring bashing
And mine (springs recommend by MP) had lost 50% of its rated pressure in a week as did the next set. I wasted hundreds of dollars chasing the problem not to mention track time and more $$$ towing too and fro.
Good luck with your springs, russian roulette if you ask me.
Posted By: 52savoy
Re: 440 falls off at 5 grand...Stumped - 07/28/13 04:30 PM
I can't vouch for what's sold now.
My springs have proven themselves by lasting all these years on nothing less than .600 lift. What else can I say other than I'll run them as long as the pressures stay up.
1970s and counting
As far a motor not revving...I agree with you guys. It can be gas delivery(pressure or adjustments), timing, valvetrain and possibly internal engine.
I'm a big fan of common sense..I would never jump to the conclusion it's springs before eliminating other potential problems first
Posted By: gdonovan
Re: 440 falls off at 5 grand...Stumped - 07/28/13 05:33 PM
Quote:
I'm a big fan of common sense..I would never jump to the conclusion it's springs before eliminating other potential problems first
Which I already pointed out, taping a fuel pressure gauge to the windshield and going for a ride would eliminate the fuel pump as a possible issue.
Cheap stuff first.
Posted By: NITROUSN
Re: 440 falls off at 5 grand...Stumped - 07/28/13 06:15 PM
Quote:
I picked up a summit dualfeed line with filter and gauge and a separate line to tape the gauge to the windshield. I got a constant 4 psi with no drop in pressure,engine still falls at 5 grand. I took theline off and installed it to the feed line and get a chatty 6.5 psi. I also replaced the fuel pump rod with a mancini one.
I would verify the needle and seat are correct. There is a certain size needed to allow enough fuel to enter the bowls. If to small you may be starving for fuel even though you have pressure. Pressure is flow to resistance.
Posted By: TJP
Re: 440 falls off at 5 grand...Stumped - 07/28/13 06:51 PM
Quote:
I picked up a summit dualfeed line with filter and gauge and a separate line to tape the gauge to the windshield. I got a constant 4 psi with no drop in pressure,engine still falls at 5 grand. I took theline off and installed it to the feed line and get a chatty 6.5 psi. I also replaced the fuel pump rod with a mancini one.
Ok, Lets assume fuel pressure is OK.
Does it drop at the same RPM in a 3 gears???
1. try the air cleaner off, (been bit twice by that, and its a kwik test,
2. if your running Chrysler electronic ignition you can try another control box, (long shot but again cheap and kwik)
3. next, I would try uncorking it,
4. valve spring time
Posted By: stinger
Re: 440 falls off at 5 grand...Stumped - 07/29/13 02:34 AM
Quote:
Quote:
I picked up a summit dualfeed line with filter and gauge and a separate line to tape the gauge to the windshield. I got a constant 4 psi with no drop in pressure,engine still falls at 5 grand. I took theline off and installed it to the feed line and get a chatty 6.5 psi. I also replaced the fuel pump rod with a mancini one.
I would verify the needle and seat are correct. There is a certain size needed to allow enough fuel to enter the bowls. If to small you may be starving for fuel even though you have pressure. Pressure is flow to resistance.
I've thought of this but not checked into it yet.bought a used carb and rebuilt it with a fast kit. I still think it's a fuel issue,car dose not sputter or pop,just sounds like running out of fuel. cant find info on what size needle seats are used.???
Posted By: RapidRobert
Re: 440 falls off at 5 grand...Stumped - 07/29/13 02:51 AM
I had a stock (rules required) airtex mech pump on a circle track 360 (9:1CR, 2bbl) with 5/16 line & there was NO delivery issue at WOT at 6300 RPM at the end of the straights. I'd sure think a DP holley would not have inadequate needle/seat sizes. Stay on this & keep us updated as we are anxiously awaiting the outcome
Posted By: ek3
Re: 440 falls off at 5 grand...Stumped - 07/29/13 03:45 AM
chased a fuel issue before because I did not have a gauge to check it.[ get one]. after changing almost everything that could be changed , I looked at the fuel pump - PUSH ROD - and it was worn off just enough to deliver some fuel !!
Posted By: karmakritters
Re: 440 falls off at 5 grand...Stumped - 07/29/13 04:17 AM
This sounds like the same issue I was having with my 440 last year. Check the rotor phasing in the distributor. My truck would pull hard to about 4500 rpm and then act like it was hitting a rev limiter. Turned out at idle the rotor was firing in the proper spot. Once the rpm's came up it would get farther off until it caused a mis-fire.
Posted By: 68CoronetRT
Re: 440 falls off at 5 grand...Stumped - 08/04/13 10:46 PM
Did you solve this problem yet?
Posted By: stinger
Re: 440 falls off at 5 grand...Stumped - 08/05/13 04:38 AM
tried .120 needle valve seats.car dose not fall on it's face anymore but still breaks up just past 5 grand. I'm ready to move on to the valve springs now. the question is will the comp 911 springs work with the 303 cam or just order the Lunati spring kit? I can stop by Mancinnis and get the 911 springs on my way to work.
Posted By: Dodgem
Re: 440 falls off at 5 grand...Stumped - 08/05/13 06:50 AM
those springs should be fine.
Posted By: 68CoronetRT
Re: 440 falls off at 5 grand...Stumped - 08/15/13 01:33 AM
Posted By: RapidRobert
Re: 440 falls off at 5 grand...Stumped - 08/15/13 01:36 AM
We need resolution
