Joe, I'll need to get the blower off the engine to check it. I might be able to do it this evening.

How about resistance in turning it? Should it be super easy to turn or offer some resistance?

Tom I think what you have is a intake charge cooler rather than a supercharger.

Yay. A glorified cooling fan. Not.

Generally, they are pretty easy to spin, compared to a 8-71 type of blower. I'd definitly pop the blower off, and check those clearances with a feeler gauge. Check it across front to back of case on all 4 lobe ends. Let us know what you find.

The only way to determine actual air temperatures in the manifold is with a temp probe/gauge. The blower case feeling thing can be misleading.

Couple other things. The 250 blowers mounting setup kinda sucks. Very often, guys would overtorque the 4 bolts holding it on, and distorting the case. The teflon doesnt like that. I've actually torqed the blower down to spec, and felt the binding from the stripping when turning it after mounting. I had to loosen bolts, and tighten them in a fashion where the teflon did not rub the case anymore.

The o-ring that seals the blower to the manifold, sucks. I'd run the gasket RBS sells for them. I've ran both, and the RBS gasket simply seals, the o-rings didntt. B&M actually came out with a tech bulletin at one point, advising customers to stop using the o rings and use the gasket. not sure which one your using, but just thought i'd mention that.

I'm not far from Va Beach, if you don't mind who is / was your engine guy? Just curious as there are not many good ones around here.

I built the engine. Jeff Riddle ran it on his dyno for me.

Joe, you might have it nailed with the o-ring gasket. I was going to replace it, but it got really well so I went with it. Crap. Still shouldn't be falling off at 5500, but that's probably a separate issue.

I did torque the case to the manifold correctly (12 ft lbs).

OH S#it, I better get updating that thread.

The blower in the pics in the thread that Joe referenced basically free wheels, little to no resistance. My other blower has resistance and actually makes a pumping sound when turned over. It's pretty tight and was rebuilt/stripped recently. You can definitely can tell the difference. The Blower Shop had the best pricing on the rebuild kits and the Teflon stripping. Pretty easy to rebuild and can do it in a day if you have the parts and pullers. You would need to remove the front bearings before ordering parts. There is a double or a single row version for the bearing.

http://www.theblowershop.com/store/b...60_63_127.html
http://www.theblowershop.com/store/t...-c-60_103.html

Pm commandersander on here if I'm a liar. I bought the motors from him. And he told me the blowers were brand new beside basically dyno time and made 653hp on 5psi I believe. It pushed my boat to 94.8 on GPS and I literally only ran it for maybe 15 hrs.

Wasn't commandersander outed as a liar selling a new part that wasn't ? Or do I have the wrong guy ?