Ran my sb stroker today chasing a oil leak , had to pull a header to see the back of a valve cover for leakage , found oil soaking around #7 header tube @ the head , did not see anything so I cleaned up the oil & ran the engine at idle without the header for a short time to find the leak , well this puppy idled @ 2200 norm is 1250 ? whats up with this ? tried to back off the idle screw till it ran out & was still at 2000 .Found a bad valve seal on #7 & its pumping oil out the exhaust port that was the leak but whats up with the rpm , we run short tube 1 3/4 fenderwell headers open with 3 1/2 collector can they be too small?