400 bogs
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Freshman User
Joined: Mar 2001
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400 bogs
I have a 400 in my 77 f-250 if i am driving and floor it it boggs it wont take wide open throtle the motor is pretty much stock I have an edelbroch manifold and carb I thought it was in the timing so i bought a new distrebuter and it did the same thing I alo changed the timing chain I tryed putting a holley 750 on it did the same thing also went back to the stock manifold and carb it runs the best with my edelbroch 600 but it still still boggs at wide open throtle.
Elder User
Joined: Jun 1999
Posts: 861
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From: SE PA
400 bogs
Have you checked the float levels and if you have, have you richened the secondaries? You may need to jump up a few jet sizes, in the Eldy you will have to remove the airhorn but is fairly simple and won't spill any fuel but make sure you have a clean screwdriver/needle-nose and area because the bowls will be open.
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Joined: Jan 2001
Posts: 56,950
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From: Virginia
400 bogs
Check the timing with a light to see where you are at (so you can put it back if need be) and then loosen the dist and advance the timing a little bit (don't need the light for this), so the engine speeds up a little. Try it, and see if it helps.
Junior User
Joined: Dec 2001
Posts: 83
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From: Decatur
400 bogs
>I have a 400 in my 77 f-250 if i am driving and floor it it
>boggs it wont take wide open throtle the motor is pretty
>much stock I have an edelbroch manifold and carb I thought
>it was in the timing so i bought a new distrebuter and it
>did the same thing I alo changed the timing chain I tryed
>putting a holley 750 on it did the same thing also went back
>to the stock manifold and carb it runs the best with my
>edelbroch 600 but it still still boggs at wide open throtle.
Are you running w/the stock timing chain? It is set at 4* retarded cam timing. If so, this may be the culprit. The 351M was intalled with a 2150 2 bbl. & emissions junk, w/the timing retarded 4* via the timing chain.
I had upgraded to a 4 bbl. & Edelbrock on my 351M years ago, but didn't think about cam timing, had a bog, got crappy milage, & didn't come alaive until 2000 RPM. Installed an Edelbrock timing chain at "stright up" setting, set ignition timing at 10* initial, & it was quite pleasant, w/o the deraded "bog".
>boggs it wont take wide open throtle the motor is pretty
>much stock I have an edelbroch manifold and carb I thought
>it was in the timing so i bought a new distrebuter and it
>did the same thing I alo changed the timing chain I tryed
>putting a holley 750 on it did the same thing also went back
>to the stock manifold and carb it runs the best with my
>edelbroch 600 but it still still boggs at wide open throtle.
Are you running w/the stock timing chain? It is set at 4* retarded cam timing. If so, this may be the culprit. The 351M was intalled with a 2150 2 bbl. & emissions junk, w/the timing retarded 4* via the timing chain.
I had upgraded to a 4 bbl. & Edelbrock on my 351M years ago, but didn't think about cam timing, had a bog, got crappy milage, & didn't come alaive until 2000 RPM. Installed an Edelbrock timing chain at "stright up" setting, set ignition timing at 10* initial, & it was quite pleasant, w/o the deraded "bog".
Senior User
Joined: Dec 2001
Posts: 356
Likes: 0
From: space city
400 bogs
if it was running fine and then just started doing this, then i'm thinking maybe accelerator pump failure or vac. advance spring broke so it opens at same rate as primary. seems like clogged cats used to do that too...
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