250 head vs. 280 head - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 06-27-2011, 03:12 PM Thread Starter
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250 head vs. 280 head

Does anybody know the design difference between a 250 head and a 280 head. I'm looking at a car (250SE) that believe has the original block, but has a 280 head.

No big deal?

Michael
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post #2 of 4 (permalink) Old 11-23-2011, 02:10 PM
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I have the opposite, 250 head on a w108 280 sel
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post #3 of 4 (permalink) Old 11-25-2011, 09:51 AM
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The engine plate is above the oil filter. A 280 block will start with 130.9xx. The engine designs are similar only the displacement is different.

The block for a 250SE starts with 129, i.e. M129 and M130 for the 280SE.

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post #4 of 4 (permalink) Old 11-25-2011, 02:52 PM
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My 250 head is on a w108 280 SEL "BODY" and my engine is a(n) m129.
129 980-12-028007 to be exact. I don't know why the original owners would have swapped a(n) m130 for a(n) m129. Could be because they were more popular and cheaper. I purchased the car without service records, big NO NO. I was new to MB classics when I purchased the car and later realized that the chassis data card was removed, the distributor did not belong to a 280 sel and then surprise surprise the engine and head did not belong to the 1970 280sel....One thing that i do notice is a small metal plate with rivets just below the engine number stamped on the engine. I can clearly see the m129 designation on the plate but all the rest of the numbers are very hard to see. My w108 currently runs rich and I just checked the cold start valve this morning with the ignition on(car off) and I noticed fuel coming out when i removed the 7mm bolt. I'm actually in search of a w126 300sdl but I've had no luck. I am also considering a w126 300sel. I also drive a 1979 300sd and I call this car a work horse. Very dependable car. Will be removing the electrical/ mechanical window regulators and will be converting to manual. I'm tired of removing and replacing these poorly designed parts.
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