i have recently built a modified N/A engine but been hearing a noise coming from in de head i had a few ppl take a listen to it and here are some of they views 1. guy said i sounds like hydraulic lifters :roll: (note 2zz does have hydraulic lifters they have a soild lifter) 2nd, 3rd and 4th guy said it sounds like my shim clearance wrong and i can't be getting maximum lift so i called up de engine builder to ask a question. builder says check de lift bolts see if dem broke (they are not car still going on lift) check and see if de head getting enough oil (checked that nuttin was restricting the oil flow) checked a few other things and everything else was fine. So builder asked if i over rev de car i was like um how can i over rev using a standard ecu? den he ask if i have bent valves i said if i do your measurements were wrong but i dont cause the car is driving fine. So my question is how does shim clearance become wrong and where can i find someone to have the shim checked and re-shim This is keeping me from having the car dyno tuned