Correct Bolt lenght for Megan Racing Stainless Header

[d4w1]

Check the thread grip on 2 nuts at the studs. No threads exposed past the nut and the 3 bolts that thread into the engine head. You maybe have 1 1/2 threads of grip into the head. I you don't believe this, measure the thickness in mm of the head plate plus the gasket. This measurement is 18mm thick. Now measure the stock bolt grip from the washer to the end of the bolt. This measurement is 20mm. That leaves only 2mm's left or about 1 1/2 threads of grip. You are lucky that you have not had any problems on the installs you have done. If anybody decides to replace the studs with the correct lenght hardware. You will need a TORX E7 External socket for easy removal.