What is the diff? Holley 4150?4160?
 

What makes the Holley 4150 different then the 4160 carbs???
Need a rebuild kit but don't know which one I have!
:bowtie:

a 4150 has a primary AND secondary metering block. The 4160 only has a primary block. The 4160 uses a metering plate for the secondaries, therefore you cannot change the jets on the secondaries. Holley makes a kit to change the 4160 over to a 4150 but you really don't need it unless you will be using the secondaries a lot. To tell the difference just look at the carb, if it has a metering block between the bowl and the body on the secondary side it is a 4150 or an already converted 4160. hope that helps. if not gimme a holler.

Nathan

Thanks man!
The problem is I have both! 1 4160 from 1998 or so and 4150 from 1967.
The old one is in a 100 pieces but I want to bring it back!
The new one has the ****y flat float bowls, and it also needs rebuild.

I never noticed on the 4160 that it has no secondary metering block!
Thanks again!

Nathan do you alot about the metering plates on Holley carbs??
I'm wondering if all secondary ones are the same on 4150 carbs, and the
Primary's are the same???
Or are both the same?
Or are there lots of different ones for tuning styles? I always thought the tuning was in the jets??
It say this because the gaskets looked different but they fell apart so fast I lost track!~Glug Glug Glug~ Ahhhh!

Anyways Thanks
Cheers

you can always use jet drills on the metering plates to open them up thats what i did on mine cheaper than new jets anyways but once u drill it u cant put the metal back

there is uncountable # of metering blocks. the differences mainly in the aeration wells & other passages inside where the average guy cant get at. I personally highly dislike holley blocks. you can get some fron other makers like Demon etc. that are way better. (consistency)
I say rebuild the 4150 & sell the 4160. the older ones are cast better.

you have to watch what metering block you have. There are about 3 different metering block gaskets and it does make a difference which one you need. on some of the older ones if you put the newer gasket in it will just bypass the power valve and run a stream of fuel in all the time. Like 68C15 said there are all kinds of metering blocks and they have all sorts of different jets in them. the metering plates I think are all the same but I don't know the size of the "jets" in them. A good book to look at is Holley Carburators, from HP Books. has all sorts of info and good diagrams. some is geared toward the all out racer and some for the street guys. It is a little dated but most of the info is still relevant. Good books are wonderful. Hope this helps.

Nathan

Can you give us the numbers off the air horns and metering block/plate? Then I can tell you exactly what you have.

I'll get the #'s in the morning(it is fn snowing out there)
Not ready for winter!
I'll post every # I can find!
I agree with you, I want the 67 original 4150 all rebuilt.
If I mess up the gaskets I'm wasting my time!
I also emailed Holley Tech on this one.

Cheers and Thanks again!