There are 3 different pistons used in a 230SL engine depending on when the engine was built. Early 4 ring pistons with 24 mm pin, 3 ring pistons with 24 mm pin and late 3 ring pistons with 25 mm pin. The early pistons use different conecting rods that are gun drilled to lubricate the piston pin bushings.
I have engine rebuild kits available that include pistons, bearings, timing chain, rails, chain tensioner, gasket set, valve guides, valver stem seals and pin bushings. The oil pump is priced seperately because each different pump is priced differently.
If you need ( and should use ) crank gear, valves, springs, cam gear, crank spacer and other parts they're priced seperately.
There are always other things to look at like fuel hoses, injection pump rebuild, engine hardware parts plated, engine bay painting, clutch parts, tans rebuilds, flex disc and possible drive shaft rebuild. If the car has been sitting for a long time I strongly advise anyone to have the fuel tank cleaned and avoid a whole lot of problems down the road. All of this work could easily cost 10 - 15K.
Dan Caron's
SL Barn
benzbarn@ebtech.net
slbarn.mbz.org
1 877 661 6061