Overview Product Description Engines w/ silent type upper chains only. w/ late NGC cam target wheel. Cam wheel has three "timing windows" near the "L" timing mark. Product Videos Custom Field Product Reviews Write a Review Write a Review × Engine Parts Engine Timing Set - Kit Part - TS393A Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments