As mentioned in a previous question, I just finished 350 engine with Performer RPMcam, heads, etc. Sorted out some timing questions, but I have no engine vacuum. At 18 degrees initial timing and 1100 rpm, I only had 6in vacuum. Now at 14 degrees and 1200 rpm, I have no vacuum - zero, zilch! (Holding finger over a vac. port, there is a little suction, but not enough to register on the guage.) Searched all over for a leak and can't find one. Any ideas? Could there be an internal leak or something? I have no idea where the vacuum is going.