Standard Volume vs. High Volume
#1
Standard Volume vs. High Volume
Hey guys, Just pulled the motor out of my 69 Cutlass S for various reasons. It's a brand new remanufactured 350 rocket with less than 500 miles on it. Everything is stock in the motor except for the cam. It has an old oil pump on it and an old water pump. They are not new. I want to replace them while the motor is out but not sure if they should be replaced with standard or high volume parts. Also have a brand new vintage air AC system as well. All suggestions are appreciated, thanks!
Last edited by Cpriester123; August 10th, 2016 at 11:58 AM.
#2
Standard should work fine. Be sure to match the water pump to your current one - there are three different snout lengths depending upon application and two different hose nipple diameters depending upon year (71-up is smaller than 70-older).
#4
If the engine is new and stock, with tight clearances, a high volume pump will offer no benefits, as the extra volume will just be shunted through the relief valve back into the oil pan.
It won't hurt anything (except maybe by taking a couple of extra horsepower), but it won't help either.
- Eric
It won't hurt anything (except maybe by taking a couple of extra horsepower), but it won't help either.
- Eric
#6
If the engine is new and stock, with tight clearances, a high volume pump will offer no benefits, as the extra volume will just be shunted through the relief valve back into the oil pan.
It won't hurt anything (except maybe by taking a couple of extra horsepower), but it won't help either.
Thanks appreciate it Eric
- Eric
It won't hurt anything (except maybe by taking a couple of extra horsepower), but it won't help either.
Thanks appreciate it Eric
- Eric
#7
A standard oil pump is all you need. A High volume pump will just put more stress on your distributor drive shaft and rob horse power.
A GMB water pump is aluminum vs. the stock cast iron unit. Last I heard, they're not being made any more. Oldsmobile is a small market.
A google search will tell you if one or any is still available for your engine. Or search your favorite parts provider. You might find one in stock
A GMB water pump is aluminum vs. the stock cast iron unit. Last I heard, they're not being made any more. Oldsmobile is a small market.
A google search will tell you if one or any is still available for your engine. Or search your favorite parts provider. You might find one in stock
#8
I suggest a parts store water pump. It will have a warranty on it which might come in handy.
The oil pump is your preference. As the others said, there is no need for it; however, since you have the engine out and are taking off the oil pan you Might As Well get it done.
The oil pump is your preference. As the others said, there is no need for it; however, since you have the engine out and are taking off the oil pan you Might As Well get it done.
#9
#10
A standard oil pump is all you need. A High volume pump will just put more stress on your distributor drive shaft and rob horse power.
A GMB water pump is aluminum vs. the stock cast iron unit. Last I heard, they're not being made any more. Oldsmobile is a small market.
A google search will tell you if one or any is still available for your engine. Or search your favorite parts provider. You might find one in stock
A GMB water pump is aluminum vs. the stock cast iron unit. Last I heard, they're not being made any more. Oldsmobile is a small market.
A google search will tell you if one or any is still available for your engine. Or search your favorite parts provider. You might find one in stock
Tim
#11
I agree the stamped steel impeller is not the best design. When my water pump needed replacing a few years ago I did a lot of research. Looked into having a factory pump with cast impeller rebuilt, actually bought a Flowcooler pump but sent it back cuz I didn't like the housing design, finally just bought a reman from the local parts store. As I said, it cools fine in Phoenix summer heat so apparently the inferior impeller is still capable of adequate coolant flow.
#13
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