I used my lower intake bolts for my rpm intake install, worked fine. The uppers worked fine too except I had to make a stud for the front drivers side since there wasn't enough clearance to have a bolt long enough to fit in the space, and the top two bolts I had to buy shorter ones from lowes. I used 5/16" bolt that was 5" long with 18 threads per inch. Stick a washer on the top bolts and it's good. The factory top bolts were a little to long to risk stripping threads out of aluminum.
I set my expl. top on my lower, took a stiff wire and
put it down the holes, kept going down till the end of
the wire went just past the threads in the lower,
held my thumb on it at the top of the hole, pulled it
out and measured it.
Got cadmium plated (bright shiny) bolts at Lowes
for very little.
put it down the holes, kept going down till the end of
the wire went just past the threads in the lower,
held my thumb on it at the top of the hole, pulled it
out and measured it.
Got cadmium plated (bright shiny) bolts at Lowes
for very little.