Hey everyone. I have a 1995 chevy silverado, 1500, 350 5.7L for quite a while now, theres been a pretty loud ticking noise that scales with my rpms as i accelerate, heard inside the cab, i cant figure out what it is. It seems to only make noise inside the cab when its in drive, but when its in park, its heard outside the truck quite loud, but no sound made inside. I recently had a set of long tube hooker headers installed, true duals thru flowmaster 40 series exhaust, so im assuming the problems coming from that, but ive tightened down my headers and whatnot, just have no clue how to diagnose how to solve the problem. Since im a student i cant afford to take her into GM and have them figure it out for me, so i was wondering if anyone had a idea as to what is exactly causing the sound and how to fix it.