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Stronger headbolts for M104 engine.  Recommended to use with turbo application


Tightening instructions:

Tighten bolts in stock numbering order.

First all bolts to 50Nm 

Loosen all bolts

Step one 50Nm

Step two 70Nm

Step three 90Nm 

Let the engine heat to working temperature ~80deg

Let the engine cool down.

Tighten to 125Nm


M104 Head bolts

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