External Oil Cooler-4 bolt BB Chevys
 

Interested if anyone has info/photos of any factory/dealer installed external oil coolers utilizing the dedicated tapped/threaded holes in the area of the oil galley. If none available from factory/dealer, what were most folks running for street/strip duty? Where did they mount the cooler?

Thanks,

Re: External Oil Cooler-4 bolt BB Chevys
 

I had saved pictures of an NOS GM cooler on eBay several years ago. I'll see if I can find them. It seems like it would have been mounted in front of the radiator for maximum cooling
Steve

Re: External Oil Cooler-4 bolt BB Chevys
 

Sam,
I believe I have a old 70's book at home regarding building Chevrolet big blocks and in it there is a photo of that installation. It may have been on a Can Am engine. If it is not packed away I will dig it out and scan it for you tonight late.
Rick

Re: External Oil Cooler-4 bolt BB Chevys
 

Were coolers an option or an accessory?

Re: External Oil Cooler-4 bolt BB Chevys
 

seen quite a few harrisons on T/A small blocks mounted on the left hand side of the rad support.

Re: External Oil Cooler-4 bolt BB Chevys
 

Is that a reference to "harrison" external cooler?

Re: External Oil Cooler-4 bolt BB Chevys
 

Sam

I have great pics of one that I just looked at last week... HARRISON is on it.. Unfortunately my home computer is getting a tune up, so I have not been able to download the pics I took of it.. but it is Primo!! Cool item

Re: External Oil Cooler-4 bolt BB Chevys
 

Sam,
I sent you and e-mail. Hopefully it helps. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif
Rick

Re: External Oil Cooler-4 bolt BB Chevys
 

[ QUOTE ]
Sam,
I sent you and e-mail. Hopefully it helps. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif
Rick

[/ QUOTE ]

I got it and it is good info. I suggest you share it with the crew. https://www.yenko.net/ubbthreads/imag...lins/beers.gif

Re: External Oil Cooler-4 bolt BB Chevys
 

Yes Harrison...

Re: External Oil Cooler-4 bolt BB Chevys
 

Sam,
Go ahead and post it. The doc is too large for me to post here and my home software cannot reduce it. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif
Rick

Re: External Oil Cooler-4 bolt BB Chevys
 

I got it reduced. Hopefully you can read it.
Rick

Re: External Oil Cooler-4 bolt BB Chevys
 

Rick - a tad hard to make out. I will cut and paste what you sent me - hopefully. Good stuff.

Re: External Oil Cooler-4 bolt BB Chevys
 

Here is the info that Rick provided:

Oil Cooler

An oil cooler can be connected through hoses to the high-perf blocks by removing the plugs above the oil filter pad. You have a choice of what to install in the rear hole. Either plug the hole as the professional racing engine builders do, or follow Chevrolet's published "safe" recommendation and install a six-cylinder oil-filter by-pass valve 5575416. Either will cause oil to flow through the cooler, but the plug will ensure that all oil goes through the filter instead of straight to the engine.

If you use the bypass, oil temperature may not be reduced by your cooler because the oil may choose the path of least resistance and take the "shortcut" into the engine via the bypass. When installing your oil-cooler plumbing, keep all of the hoses at least 1/2-inch ID and avoid elbows or reducing fittings wherever possible. One 90° elbow is equivalent to 10 feet of pipe of the same diameter—so you can see how elbows can restrict the flow. Small hose also restricts flow through the cooler. Keep the hoses short. Use hoses designed for hot-oil service. They must be specified for long life at temperatures to 350°F or so. Aero-Quip steel-braid-covered hose is possibly the best you can buy for remote oil cooler or dry-sump plumbing. This hose or non-sheathed hose for oil service can be found at firms specializing in truck or aircraft parts. The oil-cooler hoses should be filled as they are installed. Or, if this is not possible, the pump must be turned with an electric drill until the entire system is filled. Failure to do this could cause bearing damage because the engine will have to turn over a lot of times before the bearings get pressure.

A big Harrison cooler, 3157804, is listed in the heavy-duty parts list. But it is not ready to use as it comes out of the box. You'll have to take it to a heliarc expert to get it cut apart and modified so that the oil flows into one end of the cooler and out the other.

Low-restriction coolers with the inlet/outlet on opposite ends are available readymade, so unless you get your heliarc work done dirt-cheap, you may want to start off with a non-GM part that needs no modification. A Boss Ford cooler made by Karmazin Products is one possibility, Ford P/N C90Z-6A642-A with mounting brackets C9ZZ-6B633-A and C9ZZ-6B634-A. The brackets are an absolute necessity, so don't overlook these rubber-shockmounted pieces when you place your order. The cooler is all-steel, so it weighs a bit more than the Harrison. It is 7" tall, 15.6 inches wide and about 2" thick. Ford high-performance engineer Jeff Quick told us that the cooler can be relied upon for about a 30°F temperature drop between the inlet and outlet, depending on inlet temperature, of course. He also cautioned us that the cooler should be mounted where it gets fresh air ducted to it with a free opening behind the fins. The cooler cannot be expected to work if it is mounted against a flat surface—or immediately ahead of the stock radiator. Either type of mounting will impede the flow of air through the cooler, which is what's essential in this instance. Mount the cooler so that it is out of the way of rocks and dirt which could clog the fins and reduce the unit's cooling capabilities.

Lest the over-$100 price of either the Harrison or Karmazin cooler tempt you to try to use an automotive heater radiator core for a cooler, let us assure you that such items are not designed to withstand oil-pump pressure. The pressures developed in cooling systems are far less than those in an oil system.

A lot of air-conditioning evaporators are seeing racecar duty as oil coolers. They are available in a wide variety of sizes and shapes and they're reasonably priced in a scrap yard. Select one with a tube diameter of close to half inch and have fittings heliarced on to accept the oil lines. Have the unit'pressure checked. As a rule, an evaporator will withstand more than 100 PSI which is adequate for cooling big-block oil.

A common mistake when modifying an oiling system on a high-performance engine is over-cooling the oil. Oil should be kept at about 200°F to flow properly. Oil temperature should be measured where the oil comes back to the engine from the cooler. However, it is important to install the temperature sender so that it does not restrict oil flow in any way. A temperature range of 180 to 230°F is normal. Oil temperature should never exceed 230°F-but often will, regardless of how hard you try to keep it at a cooler temperature. Chevy suggests that the oil in the pan should never .exceed 300°F.

Harrison cooler listed in HD Parts List is a good cooler if you modify it internally so that oil flows from one end to the other. The inlet must be at one end and the outlet at the other.

Thanks Rick!https://www.yenko.net/ubbthreads/imag...lins/beers.gif

Re: External Oil Cooler-4 bolt BB Chevys
 

Geez! I hope you only had to do a copy and paste and did not have to manually type all of that! https://www.yenko.net/ubbthreads/imag...lins/dunno.gif Thanks Sam.
Rick

Re: External Oil Cooler-4 bolt BB Chevys
 

Rick - a small price to pay to help out the boys and girls! https://www.yenko.net/ubbthreads/imag...mlins/wink.gif In reality, if I did have to retype it, you'd probably see it sometime next month! https://www.yenko.net/ubbthreads/imag...ins/tongue.gif

Re: External Oil Cooler-4 bolt BB Chevys
 

Here is the one I have pictures of an access to.. have no idea what it is for or the value?? anyone??

Re: External Oil Cooler-4 bolt BB Chevys
 

and 4 others

Re: External Oil Cooler-4 bolt BB Chevys
 

and

Re: External Oil Cooler-4 bolt BB Chevys
 

this one

Re: External Oil Cooler-4 bolt BB Chevys
 

Last one

Re: External Oil Cooler-4 bolt BB Chevys
 

Mike,

Decent of you to post those photos. That is bigger than i thot. That looks to be 5" deep by 12-14" long by 8-9" wide. Is that about right? Is there a date code on it?

Thank you,

Re: External Oil Cooler-4 bolt BB Chevys
 

I will measure.. but looks to be about 12 x 9.. will see if date is there

Re: External Oil Cooler-4 bolt BB Chevys
 

G’day everyone, hope you don’t mind me asking but could anyone tell me if the Harrison engine oil cooler p/n 3157804 is still available and where I could possible purchase one.

I have an old Australian muscle car, a 1974 Holden Torana SL/R 5000 L34 which was produced for racing and a limited number of these oil coolers were available as a GM-H option.

Thanks in advance, regards…………..Peter

Re: External Oil Cooler-4 bolt BB Chevys
 

Sorry, photo of vehicle......regards

[image]http://i67.photobucket.com/albums/h2...X/100_3106.jpg[/image]

Re: External Oil Cooler-4 bolt BB Chevys
 

Not to hijack the Oil cooler thread, but way cool someone w/ a Holden finally shows up here...I've been waiting for you, welcome Peter! https://www.yenko.net/ubbthreads/imag...iggthumpup.gif.
So your car would have the biggest engine ever offered in the Torana line V8 5-ltr?. Is this a Small Block Chevy and if so, of what exact displacement?.
Any engine pics you can share also does your car have any race history?..
Since we're into the Holdens now, do you know of any Monaro GTS cars...or ever driven one?!. These are just too cool and a far cry from the Monaros shipped to North America in recent years (Gto's)..
Also do you know of any South African Firenza 5-ltr/302 cars that may have ended up down under? https://www.yenko.net/ubbthreads/imag...lins/drool.gif.

~ Pete
https://www.yenko.net/ubbthreads/imag...lins/beers.gif

Re: External Oil Cooler-4 bolt BB Chevys
 

G’day Pete, thanks for your reply and welcome, I’m an Aussie Muscle Car collector [small time].

I grew up in the 70’s and owned the same model of cars back then, so I suppose it’s a second teenage childhood thing.

Holden’s first muscle car was the Monaro in the late 60’s [we obviously got the bug from you guys] in which they put 307, 327 and 350 small blocks, this continued up until 1973 when they dropped the chev in favour of the local produced 308 Holden 5ltr V8, which was introduced about 1969.

Our muscle cars were produced in an indirect way to compete in Australia’s biggest race of the year at Bathurst, and a lot of our premium produced muscle cars are refered to as “Bathurst Models”.

The 327 V8 Monaro won Bathurst in 1968 and the 350 V8 Monaro in 1969 against the Ford 302 V8 GT’s.

I own cars by GM-H that were produced for Bathurst in limited numbers but were road cars. In 1972 the Torana GTR XU-1 won, in 75 & 76 the SL/R 5000 L34, and in 1978-79 the SS A9X won.

I own all three of these particular models: The XU-1 is a 6cyl triple carby vehicle [mine is Strike-Me-Pink in colour] it beat the Ford GT-HO 351 V8, they were also called the “Giant Killer” because of that fact.

The L34 was the Aussie 308 V8 modified by REPCO Australia for racing, however back to my inquiry, they had a list of performance parts available through GM-H that included the Harrison engine oil cooler among other things. As I previously stated the L34 won in 1975-76 against the XA-B Falcon GT 351 V8.

The SS A9X is a LX Holden Torana hatchback similar to the L34 only a two door hatch and a few improved modifications that turned it into an unbeatable racecar of its time, winning Bathurst in 1978-79. In 79 it led the race from the start, was never passed, even during pit stops, won by six laps and broke the lap record on the final lap [Peter Brock driver]. Mine is white.

No doubt Ford has won their fair share of Bathurst races, but we won’t talk about that especially 1977 when Ford killed us !

Holden raced the Monaro up until Bathurst 1969 then changed direction and went for the lighter more nimble Torana up until 1979.

As you were asking about the Monaro, I do have a 1972 Holden HQ Monaro GTS 350 Coupe. It is one of about 300 produces and only about half were 4-spd Muncie’s. I love this car and it is in the process of being restored as it is a factory original.

As for the South African vehicles some do end up over here so I will make a few inquiries for you.

Hope I haven’t bored you guy’s with crap that probably doesn’t mean much not being in your heritage, but I’d love to get hold of a Harrison oil cooler for my L34.

I”ll post some pic’s if anyone’s interested……………regards Peter.

I just joined this forum and I am actually looking for one of these coolers.
I am working on one of two 1968 Craig Breedlove AMX's which had 2 of these coolers and we are still missing one. Any help would be greatly appreciated.

Here is a video of the car. There is 2 of them. The number one car has a 290 in it and the number two car has a 390 in it
https://www.youtube.com/watch?v=_DwcK2WQ3u4

https://live.staticflickr.com/65535/...c3a5bb50_c.jpgIMG_4571 by Rick Jones, on Flickr

Thanks, Rick

Hi.. I've had an Oil adapter from the Trans Am days that was used on the Camaro's in those days. It would be what was used for the race cars, Penske, bolts in place of the oil filter with threaded hole to go to the oil cooler.
It's still listed here for sale...

Hope this helps..