Thread: My 67XR7GT Build

Tweet

[IMG]file:///C:/Users/Gerald/Documents/Scanned%20Documents/Image.jpg[/IMG]


I'll raise Daves Bid to $105

I want to thank everyone for looking out for my best interests, but since I am a glutton for punishment I will go ahead and finish the car...

To expedite machine work at the shop, a line hone, I was going to install & torque the caps and cross bolts and found that the main caps had considerable wear indentations from repeated torqueing down of the mains, and I am using ARP main cap studs which use washers for the nuts. I wanted flat surfaces for the washers to ensure a reliable torque, so seen in the pic I had the top of the mains machined to remove the indentations.





So I have torqued the mains, and test fitted the cross bolt spacers and found several were really loose and the rest were slightly, I have set up all the spacers with a +.001" interference fit, and are having new ones made at the EDM shop that I will be picking up this morning, after which I will go and install them so the machine shop can finally do the line hone.

Once the line hone is finished, I will install the main bearings then have the I.D. measured so that I can get the mains on the crank ground to spec for a specific clearance. Shooting for .0027" to .003", I know someone was going to ask. I mentioned earlier my crank is at Performance Crankshaft getting worked over, I am having the leading edges of the counterweights Bull nosed and the trailing edges Knife edged, with the rods & mains cut to size then sent out to be nitride.

A gentleman on another site was nice enough to post this blueprint of the bottom end of the 427, since you guys like pic's. And note the torque sequence for the cross bolts.