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Old 04-24-2003, 02:18 PM
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Join Date: Apr 2003
Location: san Jose, Ca
Posts: 6
Question Transplanting a 6.3/6.9 into a 250SE Coupe

I have a 250SE Coupe with an 6 cylender engine (apart and needs everything).....

I want to use the drive train from a 6.3 sedan and move everything over to my 1965 Coupe....I discussed this idea with some MBZ crazies, they say it can be done easily.....because the components I can use the front and rear get the larger brakes etc....Am I crazy....I already have a 6.9 engine and trans...but I think the transplanted 6.3 from a complete car would be the best way to go....

Has any done this...Comments, suggestions, I need HELP....

should I consider the 280SE 4.5 as a better choice...


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Old 04-24-2003, 05:38 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
There is a 280SEC in Charleston SC with a "BLOWN" & nitrous injected 6.3 that makes around 550 HP. The owner said he spent over 1500 hours in the project.
I saw the car at a MB race event at Talladega Ala. WOW!!
MERCEDES Benz Master Guild Technician (6 TIMES)
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Old 04-24-2003, 06:02 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
I would personally prefer a 6.9 both for the fuel system and the tranny.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 10-26-2003, 11:30 AM
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Join Date: Oct 2003
Posts: 100
I strongly suggest the 6.3 drivetrain. It is much quicker than ANY 6.9, period. One minor detail. Either fabricate or use a parts car 6.3 tranny tunnel. Thats a key error that some have made. It's an absolute. 6.3 parts cars are dirt cheap. It's mechanical fuel injection system when rebuilt is bullet proof if you simply change your oil every 2000 to 3000 miles and or every year. Don't believe me, believe the track slips, they do not lie. You would need to replace the 6.9's rear diff, 3 speed tranny, and completely alter it's motor to simply attempt to catch a 6.3. Then the question is still undecided on that computer fuel injection system. I have given up hope with 6.9s and am a total fan of the 6.3.
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Old 10-26-2003, 01:07 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Won't fit in a 65, the brake booster will occupy the same space as the left valve cover. MB moved the booster over about 3" on the 68 and later W108/109 to accomodate the V8 -- if you have both side by side, you will notice that the clutch and brake pedals have a differend bend to them. On the early ones, they bend to the left, on the later ones they bend to the right. I don't know if you can modify the mounting to get the necessary clearance or not.


1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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