Holley 2bbl
Posting Guru
Joined: Aug 2000
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From: (near) Denver USA
Assuming the Motorcraft carb is clean, properly adjusted, and well tuned, probably not.
You can get the flow up to about 400 cfm with the 1.21" Motorcraft carb if you clean up the booster venturis, and polish the main venturis and upper body.
A stock 351M would have a hard time utilizing the additional airflow capacity of the Holley.
You can get the flow up to about 400 cfm with the 1.21" Motorcraft carb if you clean up the booster venturis, and polish the main venturis and upper body.
A stock 351M would have a hard time utilizing the additional airflow capacity of the Holley.
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Senior User
Joined: Jul 2003
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From: St. Louis, MO
Bubba do you have any more info. on "clean up the booster venturis, and polish the main venturis and upper body"? I'm not sure I completely understand what that envolves. I think I get it but I just want to be sure before I start messing with something on this truck (it runs great!).
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Joined: Aug 2000
Posts: 1,127
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From: (near) Denver USA
Check out this thread for more info about how to improve airflow in the Motorcraft 2150 carburetor:
https://www.ford-trucks.com/forums/s...hreadid=128651
Don't get me wrong, the Holley carb will work, and probably work fine. Some people really like them.
Unfortunately, a lot of performance testimonials come from people who compare the performance of a worn out, mis-adjusted, filthy stock carb with a brand-new Holley (or Edelbrock, or whatever). And for some reason, people are more willing to spend the time and effort to tune a carb after they've dropped $300 on it ($500 if they had to swap the manifold too) than they are if it came on their truck from the factory.
From what I've seen, the Holley 2V offers very little improvement over the stock Motorcraft 2150 when the stock carb is clean and properly adjusted. And if you tweak the Motorcraft for more airflow and tune it for performance, then the Holley offers no significant performance improvement.
Compared to the Holley 2V, the Motorcraft 2150 gives better throttle response, particularly at low-mid rpm (idle to 3K). And if you get a Motorcraft 2150 carb with the variable high-speed air bleeds, you can actually tune it to deliver a more stable fuel/air mixture, with no lean spots throughout the rpm range.
https://www.ford-trucks.com/forums/s...hreadid=128651
Don't get me wrong, the Holley carb will work, and probably work fine. Some people really like them.
Unfortunately, a lot of performance testimonials come from people who compare the performance of a worn out, mis-adjusted, filthy stock carb with a brand-new Holley (or Edelbrock, or whatever). And for some reason, people are more willing to spend the time and effort to tune a carb after they've dropped $300 on it ($500 if they had to swap the manifold too) than they are if it came on their truck from the factory.
From what I've seen, the Holley 2V offers very little improvement over the stock Motorcraft 2150 when the stock carb is clean and properly adjusted. And if you tweak the Motorcraft for more airflow and tune it for performance, then the Holley offers no significant performance improvement.
Compared to the Holley 2V, the Motorcraft 2150 gives better throttle response, particularly at low-mid rpm (idle to 3K). And if you get a Motorcraft 2150 carb with the variable high-speed air bleeds, you can actually tune it to deliver a more stable fuel/air mixture, with no lean spots throughout the rpm range.
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Senior User
Joined: Jul 2003
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From: St. Louis, MO
Well the Motorcraft I currently have is about 18 months old. It's nice and still looks pretty new. The only reason I thought about swapping to the Holley was to get a little better performance out of my stock engine. But thinking more about it, I don't think I should buy a new carburetor just to get a possible sqweeze in performance.
I had a tune-up done on the motor shortly after I bought the truck (BIG difference). So my next thought, at the time, was carburetation then dual exhaust, etc.
But, I think I'll wait on the carb. until I decide if I want to rebuild it or swap out motors and transmissions.
So far now...thanks for the help!
I had a tune-up done on the motor shortly after I bought the truck (BIG difference). So my next thought, at the time, was carburetation then dual exhaust, etc.
But, I think I'll wait on the carb. until I decide if I want to rebuild it or swap out motors and transmissions.
So far now...thanks for the help!
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Joined: Oct 2002
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The best bang for your buck with the 351M is to change the timing chain to one that is straight up, not retarded. If you really want to wake it up, put in an R.V. type cam with all the related components. Add a dual exhaust and a bigger air cleaner that sucks cold air. Just adding airflow to the stock 351M is a good start, but the factory cam timing is so lazy that it's a wonder they got the advertised 135 hp from it.
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