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  #1  
Old 12-15-2006, 11:12 AM
SLacker
 
Join Date: Dec 2006
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V-8 Cylinder Head Interchange

For the V-8 engines made in the 70's, can anyone comment on:

1. Are the heads for a 450 SE or 450 SEL (117.983, 117.986) the same as the heads used for the 450 SL and 450 SLC (117.982, 117.985) of the same year?

2. Are the heads used on the earlier electronic fuel injection engines of that group, the same heads that were used on the later mechanical fuel injection motors?

Thanks.

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  #2  
Old 12-15-2006, 11:37 AM
david s poole
 
Join Date: Mar 2005
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#1----yes #2----no
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Old 12-15-2006, 03:47 PM
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Thanks for the response David.

#1 - So why different engine numbers? Is it only that they are have a cam profile to suit a different weight car?

#2 - Is it practical to convert the earlier to the later? Just add a sensor port or is the injector hole different?

Thanks again.
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  #4  
Old 12-15-2006, 04:07 PM
david s poole
 
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sl engines had one pce oil pan hence diff # the k jetronic heads have cut outs for the k-jet injector cups.
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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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  #5  
Old 12-16-2006, 10:58 AM
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the other notable difference in heads over the years is the addition of hydraulic lifters. -CTH
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  #6  
Old 12-16-2006, 05:30 PM
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The best upgrade to an older 4.5 (be it D-Jet or K-Jet) is to put on the correct corresponding 3.5 heads. Higher compression. Don't do it in a state that would still require emissions testing, though.

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