Bronco Forum - Full Size Ford Bronco Forum banner

1 - 13 of 13 Posts

·
A broke kid with a bronco
Joined
·
4,065 Posts
Discussion Starter #1
I can not seem to find a bypass PULLEY for my 351w bronco. I can find them for 302 stangs but not trucks. Why? I know I can use a shorter belt but I canno find the correct size that won't slip off and it's easier to look up a mold specific belt than remember a number for belt length.

Anyway anyone know where to get one? I thought summit or jegs would have one, but apparently not.
 

·
Age. Fac ut gaudeam
Joined
·
3,881 Posts
I believe you are without. Maybe a Mustang 5.0 would work...
 

·
Man of endless projects
Joined
·
9,494 Posts

·
Registered
Joined
·
837 Posts
Have you thought about maybe mounting another alternator in place of the smog?

For running the shorter belt:

"If you got A/C on that '89 351w the belt is a Gates K060910.
Or "a six rib 910" ...and is about 91.0" long. Ask for that" -Alvan in AZ
 

·
Registered
Joined
·
488 Posts
Keep in mind a 1994 has different brackets than a 1989. There is an extra pulley/idler wheel on the 94.
 

·
A broke kid with a bronco
Joined
·
4,065 Posts
Discussion Starter #6
A 94" belt is a little long. I put one on and when I turned the wheel to lock. It squealed like a pig and it slipped off.

A 91" belt is wayyy to short. Tried that one too.
 

·
A broke kid with a bronco
Joined
·
4,065 Posts
Discussion Starter #8
I'm going to have to try a 93.5 or a 93. I just remembered I'm running a 2.25 inch alt pulley vs a 2 5/8. I just don't want the belt to come off.
 

·
A broke kid with a bronco
Joined
·
4,065 Posts
Discussion Starter #10
Sooo next question.....

Are the 302 smog pumps and 351 pumps the exact same? I *may* be able to get a cheap working one from a friend but it's off of a 302.
 

·
Man of endless projects
Joined
·
9,494 Posts
using advanceautos site, the 351 and 302 have different model smog pumps ofr a 95 BKO. i donnt know what the difference is but what u could do is jsut buy a cheap new pump, try the 302 bypass and if it doesnt work, then use the new pump. if shorter belts still dont work, i think thats all there is you can do and its not like the pump will affect much, its jsut pumping air into ...well the air
 

·
AKA: Butthead
Joined
·
2,857 Posts
I've done this procedure twice and it worked perfect both times...

I cut the old used original belt, put it on the pulleys (but bypassed
the tensioner) pulled it as tight as I could with my fingers and just
measured the overlap, subtracted that from the original's length.

The first time was to eliminate the air pump the second time was
to buy a spare belt that can bypass the power steering pump too.

The tricky part is how there are gaps in the lengths manufactured
let alone gaps in the lengths on hand at the local parts store. ;)

Alvin in AZ
ps- I've long forgot the original belt size. LOL :)
My '91 351w with A/C but no air pump = 91.0"
Same except bypassing the power steering pump too = 79.0"
 

·
Chillin on the Gulf Coast
Joined
·
1,596 Posts
Check the vans. I just snagged one from a 96 van with a 351 last weekend. Was a bear to remove though. I am pretty sure that all of the V8 smog pumps were mounted the same with the difference being their displacements. But your not worried about what size displacement your pump was, but rather how it mounts since your using its mount to install the bypass pulley.
 
1 - 13 of 13 Posts
Top