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Building "Nightmare" (78 GMC Jimmy)

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the_blaze said:
LOL I agree! however this is one of a ton of articles i found.
Plus i went on summit and read a ton of reviews from guys switching to high performance pumps saying their BBC ran 20 degrees cooler...

Mine still runs much warmer than I like. when i start seeing 218-220+ i start to stress. If i could get it to 200 peaking at 210 i would be a happy camper :)
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ah, I didn't know (or remember) the cooling problems. Might be worth a shot if you've already upgraded the radiator. Mine runs at 190 pretty much all the time and jumps up to 210 if I climb for awhile.
 
I still think you have other issues causing yours to run hotter that a water pump won't fix, unless yours is actually bad right now.
 
New engine, rebuilt giant radiator, new hoses, new thermostat, timing is correct, new hd water pump, new cap, new HD fan clutch, new fan, adjusted the fan shroud, added a pusher fan.... temps stay around the 210-220ish range i've seen it go over 220. tell me what other issues i may be missing?? ;) we went the rounds last summer and i replaced everything. last thing to upgrade is a performance water pump.
 
I think mine runs hotter than others because the block is so punched out, i have a large cam, and i'm running domed pistons. higher compression and thin walls makes for a fire breathing engine. so at this point i'm looking less at how to keep a stock 454 at stock temps i'm looking at how to keep a hotrod engine from melting itself
 
skunked said:
ah, I didn't know (or remember) the cooling problems. Might be worth a shot if you've already upgraded the radiator. Mine runs at 190 pretty much all the time and jumps up to 210 if I climb for awhile.
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What radiator are you running? I just have the oversized brass 4 core they used in the k30.
 
the_blaze said:
I think mine runs hotter than others because the block is so punched out, i have a large cam, and i'm running domed pistons. higher compression and thin walls makes for a fire breathing engine. so at this point i'm looking less at how to keep a stock 454 at stock temps i'm looking at how to keep a hotrod engine from melting itself
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Dave's (the white 72 K5 at BB2017) ZZ502 never goes over 185. He had low rpm cooling issues when he first got it, the BeCool setup fixed it.
 
skunked said:
Dave's (the white 72 K5 at BB2017) ZZ502 never goes over 185. He had low rpm cooling issues when he first got it, the BeCool setup fixed it.
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What Radiator do you run in yours?

I have no idea what the becool setup is but i will research :)
 
the_blaze said:
What Radiator do you run in yours?

I have no idea what the becool setup is but i will research :)
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I use to think it was a Diesel Radiator (that's what I was sold) but it might actually be a BBC radiator. Either way it's a OE steel/brass radiator I bought used and had cleaned. BeCool is a aftermarket setup, runs about $1K with dual fans and built in fan switch.
 
skunked said:
I use to think it was a Diesel Radiator (that's what I was sold) but it might actually be a BBC radiator. Either way it's a OE steel/brass radiator I bought used and had cleaned. BeCool is a aftermarket setup, runs about $1K with dual fans and built in fan switch.
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I would drop the money if it "fixed" the issue...
 
the_blaze said:
I would drop the money if it "fixed" the issue...
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They make quality cooling systems, can't promise it will fix your problem however I would bet money it keeps it cooler. We have the same setup on the El Camino and it's worked great.
 
I would start with the water pump and I will tell my story again.
I had a BeCool radiator because I decided to blow the money and take the copper/brass one out for my C10. Keep in mind that my old trucks have the shorter radiator when compared to yours. I had good results with it, but I changed the water pump after the engine was out for several months. I HAD HELL AFTER THAT!! I was told by lots that my water pump should be good since it was a NEW NAPA unit. After 6 months of trying several other things , I bought the Edelbrock. I then had to undo some of the other changes to get to operating temp.
While my engine is only bored .020 , only 10:1, and a small cam, I believe that you could benefit from a better pump, especially if the one you have is not doing "stock performance ". The problem is, how do you know exactly how much coolant is actually moving, or what stock spec was?
I just don't trust parts store ones 100% anymore, when there is a cooling problem. I think that they can be suspect when other factors checked.
I don't believe that I am leading you off course, but I don't have the money to send to you for the pump, if it doesn't help. Wish I could.
 
6872xtc said:
I would start with the water pump and I will tell my story again.
I had a BeCool radiator because I decided to blow the money and take the copper/brass one out for my C10. Keep in mind that my old trucks have the shorter radiator when compared to yours. I had good results with it, but I changed the water pump after the engine was out for several months. I HAD HELL AFTER THAT!! I was told by lots that my water pump should be good since it was a NEW NAPA unit. After 6 months of trying several other things , I bought the Edelbrock. I then had to undo some of the other changes to get to operating temp.
While my engine is only bored .020 , only 10:1, and a small cam, I believe that you could benefit from a better pump, especially if the one you have is not doing "stock performance ". The problem is, how do you know exactly how much coolant is actually moving, or what stock spec was?
I just don't trust parts store ones 100% anymore, when there is a cooling problem. I think that they can be suspect when other factors checked.
I don't believe that I am leading you off course, but I don't have the money to send to you for the pump, if it doesn't help. Wish I could.
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I am with you 110% I am going to do the pump first.

I need to figure out which pump.
 
I'm finding these three. The two cheap ones say 30% more flow and have great reviews. The other doesn't give stats.

Screenshot_20180313-211944.png

Screenshot_20180313-212314.png

Screenshot_20180313-212249.png
 
kgblazerfive said:
I would get that one

Link from there page
http://www.stewartcomponents.com/index.php?route=product/product&path=60_66&product_id=92

get a thermostat also, a high flow one, aka one with holes drilled into it.
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The only issue i see is o don't have flow specs lol that edlebrock one seems pretty impressive... I mean I'm torn between the two. I want whichever will give the maximum even high pressure flow. With great reviews. Some research is to be done! Thanks guys!!
 
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