PeachParts Mercedes-Benz Forum - View Single Post

2.5-10 · #6 05-31-2010, 01:41 AM

I would pick the same year just to be 100% sure but 86+ should all be the same exact motor.

the 560 CIS is calibrated a little differently but most salvage yards give you the CIS/ injection equip for free when you buy the engine as its not commonly saught after once you have an engine. a 420 system will work on a 560 though, you just wont get 100% of the power.

you can pop the heads off, bring them to a good head shop to get them decked and redone, get some new head gaskets and probably go another 200k miles on it if you want.

I agree with not trusting salvage yard heads unless you can hear the car run.

the 5.5 really kicks you back, its a torquey monster and you are adding over a liter of displacement (mostly stroke, the 4.2 has big bores too but the 5.5 has pistons bigger than my fist.)

in realistic terms, I would bet that the MB 5.5 liter against a 383 carbed in that car, the 5,5 will push harder, faster and probably more reliably.

I swapped one of those monster 5,5s out of a 1989 560SEL (Which I paid $500 for because the paint was crap and it didnt have a radio) into my cherry 1976 240D and the motor blew up the 7.5" mercedes diff, its a strong motor and with the 9" 500SEL EURO differential, it hauls some serious ass. I can walk pretty much anything thats not an exotic in that thing and the looks on people faces. truly priceless.

I actually have a 560SL engine with SEL pan and oil filter housing sitting in my garage I'd sell you, but I dont really know how much shipping an engine would cost and I'm assuming a salvage yard could and would do it cheaper that I could.