I actually made new rocker stands and located the larger (1.00") shaft closer to the pushrod hole to get the 1.85:1 ratio. I used the existing stand mounting holes in the head (2 bolts per stand). The roller tip offset for the intake and exhaust was achieved just as Panic said in step 5 above.
I did open up the pushrod holes in the head to be safe since I went to 5/16 heavy wall, Smith Brothers pushrods.
I used the larger 1.00" shaft to keep things rigid and eliminate the end rockers from moving around like the stock ones do.
I expect the complete roller assembly will be in the neighborhood of $1000. Kinda expensive but their not being mass produced for the GMC.
Ron
