Carburation
Thread Starter
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Fleet Mechanic
Joined: Jan 2014
Posts: 1,529
Likes: 271
From: Billings Montana
New update 4/20. Jets came in today, I installed the 57 jets and it seems to run pretty well. I put about 40 miles on at speeds of 65 to 70 with one burst to about 95 mph. At cruise speed there is no sputtering/jerking and when you put it to the floor there is no hesitation. I may go down to a 55 power valve from the 65 because of low vacuum at idle due to the cam. Right now I am way happier with this little bitty 390 cfm carb for my overbuilt motor than I ever was with the 600! I think the overbuilt motor is finally starting to run like it should have all along!
Cargo Master
Joined: Mar 2002
Posts: 3,132
Likes: 217
From: W (BY GOD) V
Who said it was new? Never said that! It is a used carb if you could read you would see where I said I kitted it!
You know, it is normal not to want to learn ...
But when you go into hysterics, you might want to seek professional help ...
Any change you might have learned anything from this exercise,
... mainly that a carburetor has to be calibrated to the application and there is no one-fits-all?
That is one reason they have all those ID NOS and differing service parts.
Now do me a favor while I actually have your attention as I know you have lapses ...
Raise up a little off the chair until you can pull that deep Marvin out of your posterior ...
AND HAVE A NICE DAY/NIGHT
Cargo Master
Joined: Mar 2002
Posts: 3,132
Likes: 217
From: W (BY GOD) V
You are really getting wrapped-up tightly ..
You need to watch your health.
Mountain Pass
Joined: Sep 2021
Posts: 209
Likes: 52
From: Rincon GA
New update 4/20. Jets came in today, I installed the 57 jets and it seems to run pretty well. I put about 40 miles on at speeds of 65 to 70 with one burst to about 95 mph. At cruise speed there is no sputtering/jerking and when you put it to the floor there is no hesitation. I may go down to a 55 power valve from the 65 because of low vacuum at idle due to the cam. Right now I am way happier with this little bitty 390 cfm carb for my overbuilt motor than I ever was with the 600! I think the overbuilt motor is finally starting to run like it should have all along!
Thread Starter
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Fleet Mechanic
Joined: Jan 2014
Posts: 1,529
Likes: 271
From: Billings Montana
New update 4/23 I decided to install the 5.5 PV. I took it for a spin and it seems a little happier. No hesitation upon acceleration from start or cruising. I am now going to set the timing back about 2 degrees because it was 90 degrees here on Tuesday (today snowing) and it bound up once on hot restart. I am going to leave carburetion alone because I think it will be fine now. On another note, I noticed my Melling oil pump is leaking. It is a gear-to-gear pump that was discontinued use by Ford in 1956 Y blocks. In 57 they went to a gerotor pump. The gear-to-gear pump is the one that is reproduced. I was looking for an NOS gerotor pump and found that Melling makes a rebuild kit for that pump. I got up in the attic, dug around and found my original gerotor pump so I am going to rebuild it and put it back on. Everything I read says the gerotor pump is a better pump. Ford obviously thought that since they went with it over the gear-to-gear pump.
Lead Gopher
Joined: Aug 2012
Posts: 10,014
Likes: 1,565
From: Seattle
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Thread Starter
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Fleet Mechanic
Joined: Jan 2014
Posts: 1,529
Likes: 271
From: Billings Montana
Leave it to you to have one or ten. The weird thing is when I googled that part number on the pump box which is the same as my pump has on it, it came up as a pump for a 352. Got the Melling pump kit today and it came with a new spring, cover oring, gasket for bypass nut, gasket to block and rubber for pickup tube. All for only 56 dollars. Going to install it tomorrow.
Last edited by skidoorulz; Apr 25, 2026 at 04:15 PM.
Thread Starter
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Fleet Mechanic
Joined: Jan 2014
Posts: 1,529
Likes: 271
From: Billings Montana
Final update the 390 is working well. 57 mains and 5.5 PV and overall it works better than the 600 ever did. The only thing I think I lost a little of is acceleration at highway speed. It does not seem to accelerate as hard from65MPH as it used to when you mash the gas. I may play around with the secondarie springs eventually but as of now I am happy with the way it performs.
Mountain Pass
Joined: Sep 2021
Posts: 209
Likes: 52
From: Rincon GA
Maybe you did lose a little bit of acceleration but I am sure you still have more acceleration than the unmolested 292 had to begin with. Sounds like you are very pleased with the drive ability of the truck now which is more important. Enjoy sir.
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