Re: Intake plenum spacer???
All you need to do is pull the valve covers, and there they are, sitting pretty over the valve tips. Easy to replace too. I have a set of Motorsports roller tips, but just because I liked the looks of them. You can get different rocker ratios. The Fords typically use 1.6 ratios. You can go to 1.7 if you wanted, it would increase your effective valve lift. I haven't tried it on a speed density EFI, so I don't know if it would throw off the MAP sensor. I doubt such a small increment would affect the loop though. When you reinstall the nut back onto the rocker shaft, torque it to 23 ft-lbs. You'll have less adjustment to do when you fire up the engine. If you have a "clacking" when you start the truck, tighten the affected rocker nut down until the clacking stops, then crank it down another 1/4 to 1/2 turn, and presto, you have the perfectly adjusted rocker arm. Also...VERY IMPORTANT...When you re-install the valve cover, check to make sure the flanged surface where the bolt holes are is flat. If it is dimpled, take a soft hammer , and flatten the flange out. When you torque down the valve cover bolts, only tighten to 3-5 ft-lb. No more, or you'll leak oil sure as the sun rises...believe me.