Vintage Cars: Sl350/380, bomb proof, timing chains

Question
Hi Ron,

I am looking to buy an SL 350 or 380 - late 70 early 80's.

The reason is I want the V8 engine.

My question is; is the V8 alu block a better engine then the iron block, should I source an alu block engine?

Which models have the alu block, all the 380's?

Do any of the 350's have alu block.

Phillip

Answer
Howdy, the 72-89 V8 powered SL's all have great engines, that said there are some that are more finicky than others. The early years had the iron blocks. Then most had alloy, all models.  Its best to avoid the 74 California, and 75-76 models,these typically have problems with excessive heat in the engine compartment and some polution control stuff that goes bad. The cats were in the engine compartment and caused fires!  Also the 81 Sl's had single row timing chains and this, if not retrofitted with dual chains can spell trouble. Mileage near the 20's are typical of the later modles, early 70's 14, MPG at best.
Very very safe cars
If you buy one get the service history, this is very important, they are not high to maintain, unless they have not been maintained if you know what I mean

Run from rust, make sure all the tops are in good shape, always get service history.
 
Some would say the 86-89 were the best years. My only issue is the bumpers, they look a little big for me, but they had to meet federal regulations
In any respect , you will find these years with ABS,Air bags, anti theft alarm and back to dual timing chains.  the engines are still bomb proof and are 5.6 liter all alloy.  You may be able to find some 300Sl's for these years but most say they are underpowered. The 560 is a great car.
Let me know if I can help anymore
Ron