Originally Posted by aersloat

There is a casting number located on the aluminum head under the crossover pipe above the #2 injector. If two of the numbers are "14" then you have a #14 head. Your car came with a #14 head. MB has revised the head several times and the current revision is a #22 casting. The other most common edition is the #17. The original head had some deficiencies that could lead to cracks or blown head gaskets. The cardinal rule is to not let the engine overheat. There are plenty of #14 heads out there. There is a ton of info on the head issue as well as plenty of theories, etc.