cj7 258 HD cooling shroud and radiator for a V8 swap offset and dimension case of CRS

[Dusty]

So this is specifically about the shrouds and the fan opening offset, I already have a plethra fo radiators to compare and going aftermarket the thickness will be the same I am having a problem chasing down a 6cyl with HD cooling fanshroud to compare to the v8 shroud.


im having one of those nights where i cant remember $hit.

IIRC isnt the offset of the 6 cyl 81-86 hd fan shroud the same as the 304 v8 fan shroud? the water outlets are slightly off so there its not a plug in and play deal.... but i dont have a 6 cyl hd fan shroud (there is also a LD one that IIRC had a smaller opening and less offset.

The HD 6cyl should look like this:
http://www.jeep4x4center.com/product...number=5362539

I want to verify that the opening is roughly 19" around, and the offset is similar to the stock V8 shroud...... it should be the same diameter opening since i believe they came with the 7 blade 17" fan where as the LD had the 6 blade or 5 blade smaller fan and smaller shroud. and at one time id swear in the past i ran a HD 6cyl radiator and shroud with a 304 without any other mods and no issues....... but i cant remember what went on 20 years ago.

my reason for inquiring is the surface area of the 6cyl radiator was always more across the core than the v8 radiator 307-375 +/- cubic inches vs 405-410 cubic inches of core finned surface area. the v8 came with larger tanks but less surface area. i recently came across an aluminium radiator that is spot on dimension wise modeled after the 6cyl hd cooling radiator with smaller tanks but the larger core 408 cubic inches of core surface area. it is down flow design dual 1-1/4" core tubes and solid aluminium.... the thought is that for $200 its a pretty good option to stick in front of a 401 or other 400 cubic inch motor and building a fan shroud is not that much of a pain but if there is a basic shroud that can be swapped in thats close it might be a worthy experiment.


So can a HD cooling 6cyl fan shroud and stock radiator be used ona 304 conversion? does it match up?


And then if it does is there a problem with smaller tanks on the radiator since you are gaining surface area and larger tubes?



If i had a 6cyl shroud or even a couple of pictures witha tape measure in there i could figure alot out. problem is all 3 of my jeeps have 304, 360 and a 401.... and all run stock v8 shrouds with 18" caddy fans stuffed in there.


Bueller??

[rollbar]

I haven't ran one since I was a kid. I run a three core rad and it is plenty in the I-6/360.

[Dusty]

http://www.cgj.com/shop/radiators/an...adiators/jeep/

looking at the JP3006 it has a larger core surface area and more efficient core than what i have. at 408 cubic inches of surface area its a start. next question is will the smaller tanks effect cooling and how?

[tufcj]

The V-8 shroud has the hole for the fan much more centered. If they were the same, they'd be covered by the same P/N. The tanks are just "holding areas", I doubt they affect cooling much at all, although a smaller surface area means less cooling.

Bob
tufcj

[Dusty]

The V-8 shroud has the hole for the fan much more centered. If they were the same, they'd be covered by the same P/N. The tanks are just "holding areas", I doubt they affect cooling much at all, although a smaller surface area means less cooling.

Bob
tufcj

right.

the factory v8 radiators have less core surface area than the 6cyl radiators which is the reason for inquiring about this.

[tufcj]

I'm pretty sure the V-8s (at least with the HD cooling) came with a 3 core radiator, the I-6 was a 2 core. Dimensionally they are the same size. I think the fan on the I-6 was a little smaller too.

Bob
tufcj