Engine power question
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Senior User
Joined: Jan 2012
Posts: 333
Likes: 1
From: Denver, Co
Im in Arcada near Denver somy elevation is right aroung 5300ft. So im not to high in altitude but im pretty far above San Jose. I did do plug wires but the engine was acting up before all of this. Im heading out to work on the truck now so i will get more info around noon.
And thank you for the concern. A close friend was injured in the Centry 16 movie theater shooting but he has been cleared with minor injuries
And thank you for the concern. A close friend was injured in the Centry 16 movie theater shooting but he has been cleared with minor injuries
Cargo Master
Joined: Oct 2011
Posts: 2,251
Likes: 304
From: Kenner,La.
no power
Smokey, One other thing to check would be the relationship of the #1 piston @ TDC and the "0" or TDC mark on the harmonic balancer, these things are known to "slip" giving an incorrect timing, which results in a retarded spark. This is rare but does happen. Do not assume it is correct until you have checked it. I have been bit by this more than once.
Kenny
Kenny
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
If you get back in to the carb again check the main jets # stock was for f250 was between #54#56 c/s had the #56 #57 from what, I've found. So correct jetting is one size smaller for every 2000 ft elevation. for the norm.. Most people had auto shops re jet and tune the motor for the higher elevation when they live their. I know many flatlanders from Los Angeles that headed for the mountains would flip the air filter lid over to help it get more air to make it carb, as, I did the same. I remember once going the New Mexico and some where in AZ. in the mountains my old 57 ford was bogging down sucking gas. So stopped and loosen the dizzy and turned it until the motor rpm came up and ran better. JUMP in and it ran good again. But turned it back coming out the the mountains to run good again.. Once you figure out what the problem is your having right now . Then do the find tuning of your motor..I do have a great number of ford jets if your in need of some.. orich
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Senior User
Joined: Jan 2012
Posts: 333
Likes: 1
From: Denver, Co
WoooooHoooooo!
After rebuilding the carb and adjusting airfiel mixture she lives again! Now when i get on the throttle hard instead of crapping out she squeels the tires and runs like a bat outta hell.
Thanks for all the help guys! I really appreciate it.
Next month im throwing on a holly 4bbl carb so if i need any help ill be sure to ask!
After rebuilding the carb and adjusting airfiel mixture she lives again! Now when i get on the throttle hard instead of crapping out she squeels the tires and runs like a bat outta hell.
Thanks for all the help guys! I really appreciate it.
Next month im throwing on a holly 4bbl carb so if i need any help ill be sure to ask!
Postmaster
Joined: Jan 2009
Posts: 4,584
Likes: 3
From: Chesapeake, Va.
Good for you! Glad to hear that it's running great. A Holley 4Bbl would be a great addition if you had a 390 or bigger engine but, I think you would be better off at this time with about a 500 cfm 2Bbl which would require fewer bucks invested and stll much better performance than the present set up. It would be an easy bolt on mod. that would really improve the truck's performance, without buying and changing the intake manifold. 
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Senior User
Joined: Jan 2012
Posts: 333
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From: Denver, Co
Well ive been thinkin about a upgraded 2 barrel but the cost is slowing me down. Why im thinking about the holley is because this weekend i got the carb and a 4bbl-2bbl adaptor for free. And free is always better when your on a budget. What does a 500cmf cost?
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Postmaster
Joined: Jan 2009
Posts: 4,584
Likes: 3
From: Chesapeake, Va.
Of course FREE is the best price and you should see some improvement in performance. Just remember that an engine is an air pump and a 2 Bbl intake will limit the amount of air the engine can get into it and the performance that you can get out of it..
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
A 500 cfm is more of a performance carb and used on some big truck blocks. Plus a 500 cfm is taking in more air/fuel then a 600 cfm 4 barrel. If it's a square bore then most are haft & haft splitting like a Holley is, the cfm's primary front haft is 300 cfm. Then when the motor is at WOT and the rpm's are up to max is when you'll be pulling upwards to the max cfm, but more like 580 are so. The 500 cfm's can be run and tune for just about any motor. Many off roaders choose the 500 cfm over a 4 600 barrel as there is no bogging down or flat spots that happen with a 4-barrel sometimes so a good choose for the guy who don't want to deal with lot of tuning a 4 barrel Holley's. Learning to tune or dial in a carb is not just adjust the air/fuel mixture idle jets screws like a lot of guys think it is..Plus most likely any carb you get will need to be tuned you your altitude and your motor. So think before you jump in over your head. With any unknown carb make sure it has the correct linkage for your vehicle, like auto-choke/, auto trans kick down linkage/, Gas line change over?/, PCV, Dizzy ports/ air cleaner fit/ SMOG-LAWS FOR YOUR STATE..my 2cents
orich
orich
Postmaster
Joined: Jan 2009
Posts: 4,584
Likes: 3
From: Chesapeake, Va.
I had a 600 or 650 cfm 2Bbl on a 302 V8 van and it worked just fine out of the box. I had deklivered an engine that I built to Jegs and had carb problems from Atlanta to Columbus with the OEM Motorcraft. I got tired of fightin' it and just replaced it with a waaay bigger Holley. I figured that when I didn't need it any longer I'd sell it to a local roundy-round racer but never did so it's still in my collection of "good Stuff". One day I'll decide to get rid of it or my sons will when I'm gone.
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
4 bbl on an adapter to a 2 bbl manifold isn't something I'd recommend. Get a 4 bbl manifold if you want to run a 4 bbl.
I ran a 350 Holley 2 bbl on my old 69 390. It ran real good and never gave me any problems. I'm sure it could have used more carb on top end but that old crew cab could still bury the peg with 3.73 gears.
I ran a 350 Holley 2 bbl on my old 69 390. It ran real good and never gave me any problems. I'm sure it could have used more carb on top end but that old crew cab could still bury the peg with 3.73 gears.
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