Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
Hey guys,
I'm currently doing a full service on my cooling system to get it ready before the hot weather hits.. I did a flush today and was planning on bringing in my original I6 250 rad into the rad shop to get it steam cleaned and pressure tested. My Dad had a good point suggesting I see what a bigger new rad would cost instead of dumping money into the old one. I was thinking of going bigger so that I've already got that angle covered if I decide to go with a SBC in the future. I called my parts guy and he said his system shows the L6 250's rad the same as the 350 SBC for the 1971 year. I also checked Rock Auto and they suggest the exact same rads as replacements for the L6 and the 350 as well. Is this possible?? |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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Anything is possible but the stock radiators are not the same. I can't say specifically on the '71 but all of the I-6 trucks I have owned had 2 core radiators, all small blocks had the 3 core, and all big blocks had the four core. Maybe there were exceptions but not to my knowledge. Maybe the newer technology makes it possible to use the thinner radiators as a replacement, or maybe they only make 3 & 4 core replacement radiators. Then it wouldn't be a problem. I would check on that..... LockDoc ' |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
Didn’t ac trucks have 4 rows too? Mine is a small block 4 speed ac truck and had an original Harrison copper/brass 4 row in it with a fan clutch when I bought it…
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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i can't say if a 6 cylinder truck and a 350 rad are the same but i wouldn't be surprised if that's,in fact the case.if they are the same,no matter then but if there is any differance and a small block may be in your future,go ahead and do it now.i've had a bunch of these trucks but never a 6 cylinder?i do know the 72 big block A/C truck i have now,built at the Fremont,Ca plant,has a new rad i built.it was and is 3 cores,in tanks and saddles that would've accomodated a 4 core,core.i almost ordered a 4 but figured if 3 cores is what it came with and it lived in California and survived,it would be fine here.this is a 1 owner,75,000 mile truck in storage for 25 years til i bought it.i can't imagine anybody ever fooled with it?i did check the build sheet but there's nothing noted for the rad,only the shroud and hoses.i'll have to check the spid when i get out to the shop.
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
Interesting, thanks guys!!
Anyone know of a quality USA made repro for a decent price? I'd need the mounting brackets for the bigger rad too I assume.. Lastly, how do you tell how many cores are in the rad? |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
It the radiator is the same square footage for the I6 or the V8, two rows would likely work, if you don't run AC. But I wouldn't do it. I can vouch for the fact that a two row radiator is marginal for a 400 SBC with AC. Chevrolet tried to save money on big cars and put 2 row radiators in many. We had several of them sitting waiting for engines after they roasted, less than one year old. No savings there!
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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Very possible, and that is why I included the disclaimer. I have never owned a factory A/C truck except for a couple of parts trucks. I will see if I can remember to take pictures of the 3 different radiators this morning and post them. LockDoc |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
Ok, so I spent all morning calling around and researching options. Looks like I'm looking at $600 to get my 2 core rad re-cored and made into a 3 core. Man that's pricey!!
I've been looking at a pretty much direct replacement aluminum rad on ebay from Champion Radiator. I think they are US made, anyone have any experience with them? Here's the listing: http://www.ebay.com/itm/165232541207...o0OBh#shpCntId |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
I bought a Cold Case aluminum radiator a few years ago. I'm happy with it.
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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Here are the differences in the 3 stock radiators. Very easy to tell. You can also remove the radiator cap and look inside with a good light and count the tubes. A few may have the trans oil cooler in the way but I think you can still see over it. 2 core on the left, 3 core in the middle and 4 core on the right. The 2 core and 3 core use the same lower saddles and upper hold down brackets. 4 core saddles and brackets are different. The 2 core radiator is also narrower in width. that is why there are two sets of holes in the core support. LockDoc |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
fewer but larger (read 2 row vs 4) are better cooling. 2 row with 1 1/4" to 1 1/2" tube is better than 4 rows of smaller tube.
I have a Cold Case 2 row (1 1/4" tube) in a 67 Camaro, nice radiator. I would not hesitate to buy one for my C10 when needed.... |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
You don't need to do anything, but you can plug the bottom hole if ATF drips out. It takes a 5/16 inverted flare b-nut thread plug. Those systems are isolated from each other.
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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If I plug the holes, just metal on metal or should I use teflon? |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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With that said it makes no difference using one with the automatic trans cooler fittings. Nothing will leak out of those fittings if not connected to automatic trans. IMHO there would be no measurable cooling difference with a radiator without them. No need to cap those fittings unless you felt cosmetically it looks better. Consider this radiator from Cold Case https://www.coldcaseradiators.com/pr...case-radiators |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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The P/Ns show the same piece now because you could not get an L6-0nly radiator to save your life. They just quit making them. You can only get the V8 radiators. Good if you live in high heat country. Much more cooling surface. |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
That's why I was talking about "square footage" earlier. Did a 292 have the narrower radiator? I'd expect maybe it was bigger?
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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When I looked at my L6 2 core rad closer, it actually doesn't sit centered in the rad support opening hole cause its smaller. It's actually a few inches over to one side. Kinda interesting! The bigger 3 core should fill the hole fully now. |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
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The thin design of the L6 -- that is, all the space between the fenderskirts as opposed to a V8's width, aids in air cooling. The L25 292 has a deeper oil pan, taking 6 quarts, not 5. More oil volume aids cooling. I think 250s and 292s got the same radiator. But I'm not sure. I added a big FlexFan in Yuma in 1977. I also rebuilt that year. Later, I had to go with a V8 radiator [w/ATF plumbing] because that was the only game in town. Quite pleased with the larger volume of a 3-tier wider radiator. My Stepside just purrs at 180* all day long in summer heat -- when thankfully the Snowbirds have gone home. |
Re: Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?
There was a similar discussion on another forum. I don't remember the details but what I do recall vaguely is that there was only 1.5 quarts difference between a standard six cooling system and a 4 core heavy-duty big block cooling system.
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