When i mounted the rocker bars back on the heads, the bolts going into the ports under the intake rockers just didn't feel right to me when i torqued them to 45 ft lbs, actually three ft lbs shy of recomended 48 for aluminum threads. So i measured the actual thread engagement and found i was only getting .375 thread engagement for the 7/16/14 x 3/4 long bolts. I do have to say i have .060 shims undeer the bars, but called Jesel and asked about that before running it, and was given the OK to do so. Even with the extra .060 without the shims, at .435 thread engagement i didn't feel that was a great plan. I ordered the bolts from Jesel in one inch length, and gained thread engagement to .685, which brought the bolts a little proud in the port, but about .030 ground off the bolt fixed that. I decided to use 45 ft lbs torque, and all felt normal.