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#1
10-03-2007, 10:59 PM
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1986 420 SEL block under 1983 380SL heads ?
What I'm trying to find out is, can I install a 1986 thro' 1992 420 SEL short block under a set of 1983 380Sl heads and parts to instal in a 1983 107 380SL?
I'm 90% sure it will all fit and marry up...with the p/s pump...a/c compressor, flex plate, etc.....but perhaps someone in the collective can give me any reason why it might not be possible. Why? Because owner blew motor by forgetting to fill with oil after oil change  I have two newly fully rebuilt 380/107 116 engine heads with new cams, followers and lifters....owner said he'd like a little more power too. If not, I have to find a solid 116 block. Anybody ?  .
__________________
[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ] "A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money." 
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#2
10-03-2007, 11:19 PM
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I don't see any issues, just have to adjust the fuel delivery properly.
__________________
I'm not a doctor, but I'll have a look.  '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#3
10-03-2007, 11:25 PM
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Quote:
__________________
[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ] "A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."
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#4
10-04-2007, 12:21 AM
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I figure the extra cubes would change up the CO only.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#5
10-05-2007, 08:58 AM
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I have chased this some. The 380/420 heads have diffent PN's. All you need is one bolt hole to be different. This is what keeps scareing me off.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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#6
10-05-2007, 09:16 AM
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Agree with Chuck
The cc may be different as well as mating issues. Because MB upped the 116 to the 117 500 then, the 560. I think the 420 came later. Therefore, I would think the 500 engine would be a closer part swap for the 116 380 as compatability goes. Let us know!
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#7
10-05-2007, 09:32 AM
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My look up of the engine spec' tell me the 116 380 and 420 engines have same power ...218hp, except 420 does it at 300 rpm less. 420 is same bore but longer stroke.
With all the possible mismatches, I am going to find a 380 116 block and run a dual 2 1/2 inch exhaust.  The 420 block with 117k I found on eBay was $375.00....cheap enough. But cheap is where I usually find it gets expensive. .
__________________
[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ] "A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."
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#8
10-05-2007, 10:12 AM
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i have successfully done this swap.use the 380 intake and heads on a 420 block.it works well and definately has more power.
__________________
David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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#9
10-05-2007, 10:31 AM
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Quote:
__________________
[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ] "A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."
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#10
10-06-2007, 10:39 AM
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that is correct,no problems at all.
__________________
David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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#11
10-06-2007, 07:07 PM
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Another question
David -
Thanks for the information - this really increases the options for 380SL's. Do you think you can use a 420 block and heads with a 380 intake/injection and exhaust?
__________________
Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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