THUMPER306 New Member Feb 8, 2009 11 0 0 BROWNSVILLE,TX Sep 13, 2009 #1 Sep 13, 2009 #1 I just replaced the valve springs in my car and now it runs like crap.I shimed the springs to 1.800'' + - .015 as per trick flow.im running gt-40 heads,e 303 cam.Any ideas?
I just replaced the valve springs in my car and now it runs like crap.I shimed the springs to 1.800'' + - .015 as per trick flow.im running gt-40 heads,e 303 cam.Any ideas?