I mentioned to ATI the fact that factory Buick is slip on and they said it needs to be interference fit to work properly. I said I understand that but Buicks use 200 ft/lbs torque on that big crank bolt compared to Chevys that use less than half that torque, wouldn't that be enough to be a tight fit to absorb harmonics? His response was that 200 was way too much torque. I always hone mine to a snug slip fit and use the 200 torque. Seems to work for me........
Push rods installed and pre load set. Going to do some minor clean up on the intake manifold before install.
It’s going into the GS tomorrow. After all plumbing…….the dreaded cam break in will happen. Then off to the chassis dyno. The chassis dyno will be for tuning, data. We have a qjet, Holley hp1000, a Holley 830 to tune and run. I’ll keep everyone posted.
Got some more plumbing done. Tranni cooler done, wiring done. 1 more line for the fuel to carb, a few minor things. One issue is my 350 4bbl cable is a bout 1.5 inches too short. See pic
Well made some more headway. Plumbed fuel system, tranni cooler, front suspension is back together. Put the fan shroud in and clutch fan…..fan is rubbing on upper part of the shroud. This is a GM 1972 455 shroud with the large 21 inch 5 blade fan. Long water pump, correct water pump pulley. It appears the fan is in the shroud too far and contacting some of the concave area of the fan shroud. The opening looks fairly symmetrical versus outer diameter of fan. Im using a Hayden 2747 hd clutch fan. There was an option to purchase a low profile version…..maybe that's what I need?
The Hayden 2947 is about 1/2 inch shorter. I’m going to space the fan towards the engine 1/2 inch and see if fan would fit with this low profile Hayden product.
