Thread: My 67XR7GT Build

Tweet

I picked up the main cap spacers, and did a test fit and everything has a nice tight fit. But there is a problem, the spacers were made from a heat treated chromoly material and when I went to engrave the spacer locations on the spacers with an electric engraving tool it would barely leave a mark. I'll go by my buddies shop tomorrow and use his electric welding engraver that I have used before to number rods instead of using a numbers punch.

The crank I went with, from what I was able to find out, (C4AE 6303 G) came in the 64 427 HR and in the TBolts and is listed in the over the counter 427 7000 RPM Kits and was used as a Nascar Crank, and that the extra counter weights were welded on only on this model crank for use in the SOHC 427 Nascar program, to help keep the center main webbing from cracking during high rpm use. The program was dropped after Nascar banned the SOHC 427 from Nascar.

I mentioned earlier about a main bearing issue with this crank, as you can see it has grooved mains and is currently .010" - .010" and the mains need to go to .020". Back in the day the main bearings were not grooved, some cranks were, currently most main bearings are fully grooved and I didn't want to run grooved mains with a grooved crank. Now Federal Mogul have 3/4 grooved mains, but the problem is there no longer available in .020" under, so what I found out is the 351 Cleveland main bearings are the same size as the Ford FE and come 1/2 grooved, except the bearing tangs are not in the same location as FE bearings, and that gives you two choices, one notch the block for the Cleveland bearings or two remove the tangs from the bearings, I bought the Cleveland bearings and removed the tangs. My crank guy has given me the option of welding up the main grooves should I choose, I haven't decided yet.