putting together a lq4 just cam & heads & carb. a bit confused on the valley pan. im not going to run the knock sensors & not too sure how ill seal the holes up. the baffles on the knock sensor r wore so what r my options? I found a valley pan from edelbrock with no hole for the knock sensor, but it comes with the option to drill a pvc. why r ppl running on pvc & where the hell does it go to? thanx for any info. im a rookie when it comes to the ls'