W204 C63 head bolts

[Rich764089]

Hi. Just looking for clarification whether the C63 PP had upgraded head bolts over the standard car?
Many thanks.

 

[Jobsworth]

No. The difference is at an age point rather than a specific model. Somewhere I have the chassis number cut off between early and late, but honestly I haven’t seen any for so long now, I think all those that were going to fail already have or they’ve already been replaced

 

[Rich764089]

No. The difference is at an age point rather than a specific model. Somewhere I have the chassis number cut off between early and late, but honestly I haven’t seen any for so long now, I think all those that were going to fail already have or they’ve already been replaced

Thanks very much, that's what I thought. Someone is trying to persuade me PP had upgraded head bolts from the factory.
Thanks again.

 

[badgx]

There were 3 different types of bolts used for the M156 line up. I have no idea why they used different ones?

The first ones were of T55 head, I think up to years 2008/9, which are good but you do need to make sure you do regular changes in antifreeze as it contains inhibitors to prevent corrosion.
They then went over to the T60, was were the most dangerous bolts that had ever used, it had very little material on the head. Those were found from around 2009 up to 2011/12. They then went with the E14 bolts onwards which have a lot more material on the head, less chance of breaking off.