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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

390 carb help

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Old Mar 10, 2024 | 10:36 PM
  #31  
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That's a rather small air cleaner for a big engine. If it were me, I'd have the biggest one I could squeeze in there. The more air you're able to pass through, the better the engine will run.




 
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Old Mar 12, 2024 | 08:29 AM
  #32  
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From: small town of cusick
Originally Posted by 52 Merc
That's a rather small air cleaner for a big engine. If it were me, I'd have the biggest one I could squeeze in there. The more air you're able to pass through, the better the engine will run.
that is partially my fault, I suggested to try one for the old carb to help the vacuum signal to the venturies and help him lean out the total mixture, think I didn't explain well enough
 
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Old Mar 12, 2024 | 11:49 AM
  #33  
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From: COSMOS
PORTED VACUUM vs MANIFOLD VACUUM ......................that is THE question ~~~
 
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Old Mar 12, 2024 | 11:56 AM
  #34  
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I think manifold vacuum that’s off the port that the transmission vac line goes on
 
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Old Mar 12, 2024 | 12:34 PM
  #35  
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From: COSMOS
Originally Posted by jays 72 f250
I think manifold vacuum that’s off the port that the transmission vac line goes on
Not sure where that is , but sounds like it is from the manifold..........
Many , if not most people ( including myself ) do not KNOW which one is best to use !!! I almost have it figured out....ha
Ported is carb connected vs manifold connected . These connections affect how the engine/motor spark is timed...........Timing.........
Ported seems to be the best for MY engine , but not100% sure of that because there are good points for both & different reasons to use either.........
Topic is very complicated ( if you KNOW all the factors involved ) . Many swear they know but it can be difficult to prove...........I am starting to believe it is engine specific !!!
I digress 4 now..............ha.............I should be fixing my floor pans...............or parking lights.................or horn switch..............or pinion , or adjust shift linkage or ..............................
 
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