Thread: 348/409 reverse flow water pump help

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There seems to have been an interchange of "reverse rotation" and "reverse flow" in this thread. They are not the same. The LT motors have reverse flow. As was said earlier, serpentine systems usually have reverse rotation.

It'll be a cool ride once it's finished. Keep at it, just take one problem at a time.

A lot of the problems we seem to bring down on ourselves as "rodders" is that we're searching either to be different or trying to re-invent the wheel..
When you find yourself in that "stuck" position, drop back and use a tried and true method to achieve the goal. sometimes the different way is like getting caught in a spiderweb. And there isn't a good way of getting untangled!

Like I said, keep at it, it's coming along and I'm sure it'll be a head turner with all the hard work you've been putting in!

That sir is one cool looking truck and I'm pleased to see a 348 being used as over here I would think rocking horse shit is more common then a old W Chevy engine. Those old Chevy trucks are really starting to catch on now too down here in NZ but most have the SBC in them.
As mentioned above, soldier on and before you know it, you will be turning the key for it's first run.

There are differences in how a reverse pump and regular rotation pump work with regards to a serpentine belt system. If the pulley on the pump has grooves , it is a regular rotation pump. If the pulley is smooth, it is a reverse rotation pump.

Well---------There might be a pump from a reverse rotation MARINE engine available.
And Jack beat me to it on reverse rotation and reverse flow as in the LT engines 92-97( which were driven by gear off camshaft eliminating need for belt)

Originally Posted by 53 Chevy5

....When i was younger, with less kids and more energy I thought this thing had to be different from anything else out there so the belt setup on a 348 with the TBI seemed like a great idea. Now I wish I went with v belts or better yet, should have put the ls1 i had in it. It is different and cool, but I'm getting sick of it and just want to drive it.

53Chevy5, I think that the W block is fantastic, and I think once you get past this water pump problem it's going to be super cool. I looked back at your edited post, and you say,

I put the original one back in and it pumps more backwards than the other one did in either direction.I'll run it tomorrow and see if it will work ok, if not, i'll figure something out.

I think that running your pump backwards you'll see about 50% flow, or maybe even less depending on the impeller design? I believe the answer is to either re-route your belt to spin your pump CW, or spring for the high-zoot Billet Specialties pump.

Keep pluggin', you'll get there!

route the belt down from a/c to and over the top of water pump and wrap around pump then across the top of the crank pulley down and under over to power steering, up and around alternator--adjust position or arm angle of the idlers or discard both and fab an adjustable bracket for one of the accessories-preferably the alternator----




the site barfed as I was writing this post, but the intent was to instill some effort to route the belt the direction it needs to run things the direction they need to turn----some things will work either way-p/s, a/c and alternator

Originally Posted by 34_40

It'll be a cool ride once it's finished. Keep at it, just take one problem at a time.

A lot of the problems we seem to bring down on ourselves as "rodders" is that we're searching either to be different or trying to re-invent the wheel..
When you find yourself in that "stuck" position, drop back and use a tried and true method to achieve the goal. sometimes the different way is like getting caught in a spiderweb. And there isn't a good way of getting untangled!

Like I said, keep at it, it's coming along and I'm sure it'll be a head turner with all the hard work you've been putting in!

Wise words! As a wise man once said to me, "it is sometimes better to follow the path, rather than blaze the trail".

Quick update, switched one pulley and rerouted the belt to turn the pump the right way, 100 x better, now It will very slowly run hot running at 2k just sitting there. I think kI need a shroud but have absolutely no room for one. I think I'm going to go back to wiring for awhile. Thanks for all the advice guys!

You can make a fiberglass shroud pretty easy with a couple of pieces of plywood to form some fleece, then resin the fleece & add some mat for strength.

you might want to consider the use of an electric fan-an oem version from a Ford Tauras workd real nice and would mount directly to radiator without having to build a shroud




Your pics don't show a fan or electric fan??
so shroud????????

Jerry may be on to something - while I really like to stick with stock fan/shroud combination, this setup works perfect. Dual fans and shroud from of all things, a Sirocco. It needs a 20 amp circuit so I used a relay and a thermostat on the thermostat housing.

Just an item or two of interest for you------one of these belts WILL NOT pull a water pump AND fan from the smooth side of belt(no grooved pulley/belt ribs)


Amps required for electric fan is about the best rating out there for airflow-low amps = low cfm


A puller fan on the back of radiator doesn't block airflow at speed like a front mount

I'll check into the shrouds, i may need to move the rad forward but it has to stay cool, here is a pick of the room i have.



https://lh3.googleusercontent.com/cq...=w1104-h621-no