Tim,
I believe your SL has the M117 engine which indeed is an alusil block just like the Porsche engines of the same vintage. Try this thread:
http://db.mercedes.cx/sec/200109/06/0052.html
Cheers, Andrew Seidel.
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86 560SEC
85 500SEC Lorinser
83 300D Turbo
75 240D
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