head differences m103 2.6 vs 3.0
Thread Starter
Junior Member
Joined: Aug 2007
Posts: 39
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From: Las Vegas, NV
1987 260E
head differences m103 2.6 vs 3.0
Recently I discovered that the ticking noise coming from the number five cylinder was not a bad lifter, but in fact a ground down cam lobe. The head gasket was leaking coolant on both sides and since the motor has 300k+ miles on it, now would be a good time to replace the head. There are a few w124s at the junkyard with good heads, but since it may be hard to find a 2.6, I'll use a 3.0 head. Is there any reason I should not use a 3.0 head, or are they about identical. I also thought that maybe the 3.0 head might flow more due to the added displacement, but that might be wishful thinking.
Thread Starter
Junior Member
Joined: Aug 2007
Posts: 39
Likes: 0
From: Las Vegas, NV
1987 260E
Super Member
Joined: Oct 2008
Posts: 837
Likes: 25
From: seattle
1990 300ce supercharged and intercooled
They are the same. The only difference in the motors is the stroke.
Piston size and the heads are identical. The head and valves will surely be the same. I would assume the came is the same also, but it is possibly different.
Piston size and the heads are identical. The head and valves will surely be the same. I would assume the came is the same also, but it is possibly different.
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92 e3002.6 /91 se300 3.0 /06 SL500 V8
Head difference between the two of the m103 heads
The m103 3.0 has larger intake valve and exhaust and depending on where the destination of the vehicle when it was mfg an what country it was made for some of the 2.6 and 3.0 had a open or closed chamber head the easiest way to determine Wich one is Wich is the air pipes on the exhaust side of the head there will be a secondary air pump right above the alternator (88 - 93 m103 2.6,3.0 in the United States I believe they all had air pumps for us emissions standards
