Ok, semi-silly question here. I've got a 350 Vortec block from a 96 Chevy pickup and i was wondering if it was a reverse flow or not. Does anyone know? The best I can tell with the casting numbers is that it's just a vortec motor, not an LT motor (reverse flow right?). I am starting to piece meal my motor together bit by bit and I didn't want to screw something as important yet as simple as this up. How can I tell the difference? Any help would be appreciated. Thanks!
Ozz1967
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Ozz1967,
I think what you are talking about is the direction that the water pump turns because of the serpentine belt. The engine turns in the same direction only the water pump turns backwards. Not all serpentine systems are this way so just check to see if your waterpump is being turned CW or CCW. Everything else will bolt up.
Scholman
I think what you are talking about is the direction that the water pump turns because of the serpentine belt. The engine turns in the same direction only the water pump turns backwards. Not all serpentine systems are this way so just check to see if your waterpump is being turned CW or CCW. Everything else will bolt up.
Scholman
Ozz1967 said:
Now wait a minute. The "reverse flow" engines push the water through the heads first then into the block. The water pump is driven by gearing to the camshaft. These were in the 92-96 Vettes and Impala SS cars and a few others.
This has nothing to do with the reverse rotation water pumps of the serpentine belt systems which is still the conventional block to heads delivery system.
www.readershotrods.com see your ride?
I think your motor from the factory with the stock serpentine belt system run the water pump back wards (reverse rotation), if you don't run the stock serpentine belt system, you will need a older non reverse rotation flow water pump. (witch I would run, the stock serpentine belt system, it will work off the chevys 4.3 V6 & V8s)
someone correct me if I'm wrong.............
Mustangsaly
someone correct me if I'm wrong.............
Mustangsaly
Ok, but I can't run a reverse flow water pump on a V-belt. The rotation of the belts won't allow it. Can I put a standard rotation water pump on this thing or does it require a reverse rotation? If I cannot put a standard rotation water pump, then I will have to start scouring the junk yards for a serpentine belt system.Triaged said:
CorrectOzz1967 said:
a serpentine belt system needs a reverse rotation water pump, if you don't run the stock serpentine belt system, and run a V belt setup you will need a older non reverse rotation flow water pump, Old Style Water Pump.
with the V belt system you just need a standard rotation water pump, old style, (if I'm wrong someone correct me) why not run a chevy 4.3 V6 or chevy V8 serpentine belt system ? if you run the serpentine belt system with the Reverse rotation water pump that come with the serpentine belt system your ok. the serpentine belt system fits & gets rid of V belt setup. if your wanting to keep the stock look and run the V belt, you need a older non reverse rotation flow water pump, the Old Style Water Pump..
heres one with everything http://cgi.ebay.com/ebaymotors/82-9...QcmdZViewItemQQcategoryZ38656QQihZ016QQitemZ260018514987QQrdZ1QQsspagenameZWDVW
http://cgi.ebay.com/ebaymotors/SBC-...QcmdZViewItemQQcategoryZ38656QQihZ010QQitemZ200013552407QQrdZ1QQsspagenameZWDVW
http://cgi.ebay.com/ebaymotors/SERP...QcmdZViewItemQQcategoryZ38656QQihZ011QQitemZ320013250085QQrdZ1QQsspagenameZWDVW
http://cgi.ebay.com/ebaymotors/rat-...QcmdZViewItemQQcategoryZ38656QQihZ003QQitemZ130016026752QQrdZ1QQsspagenameZWDVW
although I've see the same setup with everything go for $65.00 to $125 or hit local salvage yards. 4.3s were in 1/2 p/us vans & cars.
Ok, well that answers all the questions except one. Since this motor came with a serpentine belt system and thus a reverse flow water pump, will it hurt the motor if I keep the stock look and my original V-belts? Is the reverse flow absolutely necessary for the operation of the motor? I do like the stock look, but...I may go with a serpentine set up. The main reason I would stay with the V-belts, is all the accessories that I have are Vbelt...AC, power steering etc.Mustangsaly said:
No, No, NO!Ozz1967 said:
Get all this reverse flow stuff out of your head. Only LT1/LT4's are reverse FLOW. However all serpentine belt systems use a reverse ROTATION water pump. There is a HUGE difference!!! The Vortec engine you have is a STANDARD FLOW REVERSE ROTATION water pump. If you want to run V-belts you will need a STANDARD FLOW STANDARD ROTATION water pump (aka one from a 55-86 Chevy).
Next you need to decide if you want to run a short or long water pump...
No worries Triaged, no offense taken. I just wish I had gotten that answer right away. The others had me a little confused and thinking this was a reverse flow engine rather than a reverse rotation water pump...and the fact that they are not one in the same. The other info was good, I just wasn't putting it together properly.Triaged said:
My plan for the motor, is to take all the current accessories on my 305, and bolt them onto the new block. So it's a GM pontiac 305 engine which probably means yes, I have the pontiac brackets. But it's a GM motor, so there should be no difference in mounting points of fitment...I think.
hello. steve here, just reading comments about reverse flow pumps.
maybe someone will enlighten me.
I'm trying to help my son on his 95 chevy 4x4. he recently purchased a 96 350 vortec from a dealer. the 95 had a serpentine system on it. will the 95 water pump work or is there something additional he needs to get it to cool properly. the only visual differances i can see between the two pumps is that the 95 has a single hose from the heater core where as the 96 so called reverse flow has the same plus another hose connection next to that one which i believe would connect to the intake. is this correct? what is all this static about reverse flow? I'm confused. If you can help, thank you!
maybe someone will enlighten me.
I'm trying to help my son on his 95 chevy 4x4. he recently purchased a 96 350 vortec from a dealer. the 95 had a serpentine system on it. will the 95 water pump work or is there something additional he needs to get it to cool properly. the only visual differances i can see between the two pumps is that the 95 has a single hose from the heater core where as the 96 so called reverse flow has the same plus another hose connection next to that one which i believe would connect to the intake. is this correct? what is all this static about reverse flow? I'm confused. If you can help, thank you!
I was confused too...however, this should help clear it up as i understand it.swcallison said:
Your water pump from the 95 will work fine. What confused me, is how the serpentine belt worked differently from the V-belt pully system. The serpentine causes the waterpump to run backwards, hence the term "reverse rotation" however the water flows the normal direction (from the radiator, down through the bottom of the motor first.) THe reverse flow engines, are LT and I believe LS motors, which the water actually flows the other way, through the heads first, and the bottom of the motor second. Anyway, bottom line is, your 95 pump will work fine.
Now to answer about the hoses. YOu need 2 hoses. One from the bottom of the water pump that goes to the bottom of the radiator. Then you ahve a second hose that goes from the top of the radiator to the thermostat on top of the engine. Those are the only two hoses that you need. For the heater, you have one hose that comes from the water pump (hot water) that goes to the heater core and one hose that comes from the heater core back to the pump (return hose). I hope this helps.
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