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  #1  
Old 07-04-2005, 07:20 AM
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2.6 vs 3.0 engine blocks

Is it possible to bore a 2.6L block to 3.0L specs without any trouble e.g. decreased wall thickness causing overheating or shortened engine life?

I thought both m103 blocks are identical, except 2.6L having thicker walls, however I saw that water passages are different and these two blocks don't look the same.

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2001 E200 Kompressor Avantgarde
1987 300E 5-speed
1976 450SLC
1975 280S (sold)
1973 230.6 (sold)
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Old 07-04-2005, 10:17 AM
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I doubt it. The two blocks have different coring. Both have the same stroke, but the 3.0 has a larger bore and they are siamezed - no coolant between the bores. The 2.6 has a full cooling jacket around the bores.

Heads are different with the 2.6 having smaller valves and ports. Too bad Mercedes didn't increase displacement by just varying stroke on the same long block like Chevies, but Mercedes never seems to do anything the easy way.

Duke
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Old 07-05-2005, 07:38 AM
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Heads are very different for sure, I just wanted to rebore the block and use the existing crank and rods.
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2001 E200 Kompressor Avantgarde
1987 300E 5-speed
1976 450SLC
1975 280S (sold)
1973 230.6 (sold)
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  #4  
Old 07-05-2005, 01:17 PM
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AMG converted the M103 2.6 to 3.2L for installation in the W201, using the head from the 3.0L version for the larger valves.

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