I'm having the challenge that I am getting mixed messages. I've even had people even tell me two different things. What triggered this was a tendency for my car to run hot under idle. While moving, the temp gauge went down quickly. I have a 440 6pack without AC.
All I know is that I do not want to keep on running the flex fan. I was running the flex fan without a clutch. I don't mind running w/o a clutch, but the fixed blade fan I purchased can only be used with one.
So...I have a regular duty thermal fan, with a regular duty clutch. The fan doesn't have a whole lot of pitch. Am I risking something by using the Jaguar fan clutch? Is it not designed for a BB? The last thing I want is for the clutch to separate and ruin my hood, radiator, etc.
Well here is what I've heard from various posts and it may, or perhaps not, help you. Obviously I'm hoping help since I just did a conversion much like your a few months back.
In regards to your 1st question: Fan clutches typically don't come with the hardware other than the hardware needed to attach the fan to the clutch itself, not the clutch to the water pump since this is in theory a R&R. Since the clutches typically come with studs, this hardware is nothing more than the nuts themselves. Then again I've received clutches w/o the studs too which required me to remove the studs from the old clutch and install in the new. However in a case like yours, you aren't replacing anything but installing something new. So what to do? Much like you I had a flex fan with a spacer so the bolts were too long. As a result I just went to the hardware store and picked up some Grade 8 (you can use grade 5 but I STRONGLY recommend 8 as it is only a few bucks more and you don't want to cheap out!) bolts with washers to mount the clutch to the water pump. Measure the base of your clutch, the thickness of the pulley and then the width of the water pump mount to give you a rough idea. You obviously don't want the bolts too long but you don't want too short where you only have a few threads in the water pump shaft mount.
As for your other question: I have heard of people running the clutches from jags and no, I've not read of any problems with the fan going through the hood or the radiator. Again, that is what I've read. However the problem with the jag clutches is that they were made for plastic fans and not metal ones. So basically the reported problem is that the clutches seems to suffer from premature failure to where some guys end up replacing them after a year and half or so. They apparently work but not for years, and again this is what I've read.
Like you, I had the same problem converting. I purchased a mopar 7 blade alum fan that came with the no longer made TRW FC28 which is a short shafted clutch that was bad. Any attempt to replace with parts from NAPA, O'Reilly's, AutoZone ended up with supposedly HD clutches that were too long and which would not fit between the engine and the radiator. Not wanting to end up replacing clutch fans I didn't go the Jag clutch route but took some measurements and looked at the Hayden clutch fan measurement info that they have on-line. While some may disagree, and they are allowed to, I personally ended up with a Hayden 2705 which was used on the AMC I6's and V8's. All in all it was a little deeper than the TRW job and moved the fan about a 1/4 inch towards the radiator but so far I've had not problems with it or overheating issues.
So, I'd say run what you have and you should be okay. Use good hardware to mount the clutch to the water pump and you should be fine. Your clutch should work but keep in mind that is may wear out faster than you expect. You'll find out soon enough if it will keep your temps down.
Again, I hope that helps.
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Do you really need a clutch at all ? I posted before,factory 3 core radiator,factory shroud fixed 7 blade factory fan,A/C 6 blade pump.180* thermostat,even has A/C,never goes above 195*
One doesn't have to have a clutch fan however it does save a ton of HP (I've heard anything from 5 to 15 HP) opposed to a ridge mount 'mechanical' fan. Electric fans are another way to do go too but the clutch fans are the old skool way of doing it.
