Most of the HD clutches sound like a small plane trying to take off. I used the Hayden 2711. It is 2.98" tall with a much shorter shaft than the 3.34" on the 2747. The HD 2947 is 2.71" tall.
I spaced the fan 0.57 inches towards the motor. Gained the space needed. So the Hayden 2947 clutch fan will be next. Bill, the gap around the fan is great, just the tips are touching the concave portion of the shroud because fan was too far forward into the shroud. See before and after spacing pics.
Might be overkill, but if the blades are detachable, I'd weigh each one individually to ensure the same amount of material was removed from each blade.
I know there is a 5 blade 20" fan, the one with the blades that are NOT equidistant. Is that the one you have? Appears to be a 71-72 fan shroud with a 22" opening. https://www.v8buick.com/index.php?threads/20-5-blade-fan-blade-vs-20-7-blade.348036/
Yes - you’re correct. 20 inch, 5 blade non equal spacing. the qjet is now plumbed. Exhaust being connected on Sunday…..getting close to dreaded can break in. Im going to run heater hose to the back corner, it interferes with the Holley feed.
Don't sweat the cam Break in just be prepared....large or two smaller fans....water hose to spray the radiator if needed....make sure fuel bowl is full..and is squirting fuel...fill the coolant system the night b4....then top off b4 starting...obviously double check the distributor is in correctly set in advanced at least 20°....bend a piece of coat hanger to clip the throttle back....and a temp laser gun I'm guilty of clipping the throttle and sitting on the stool with a beer while it does its thing ha Give a good rap of the throttle every few min...I'll zing it up to 4-5k
Forgot....VERIFY SPARK b4 cranking.....the 30min of spinning one with a starter chasing dumb **** is what gets most guys in trouble
https://www.v8buick.com/index.php?t...er-bases-stop-and-throw-it-away.363876/page-4 https://www.summitracing.com/parts/aaf-all26092 (1 3/4" drop) https://www.wixfilters.com/Lookup/PartDetails.aspx?Part=132661 (14 X 3 1/2" Filter) Just barely fits. Flat lid I had from another air cleaner,
Hugger - thanks for the tips. Will be doing all of that plus pre lubing and have a block heater installed- 600 watt to get her toasty.
https://v8buick.com/index.php?threads/engine-break-in-prep-and-video.214906/ just follow this guide, and you won't have any problems.. I have done dozens and dozens of flat tappet cam break ins with a Buick 455. Never lost a cam lobe. JW
Did the cam break in today. Engine fired immediately and never ran above 195 degrees. So next is change oil and filter, install hood, drive it to seat rings. Great morning!
When you do that, don’t be afraid to get on it on the highway, like up to 80 or 90 full throttle, back off, then repeat a few more times.
