sleeveless m pistons

johninmn

Member
are there any pistons out there that are pretty much a drop in for running an m block without sleeves? I don"t mind having to bore it or something like that but I wonder if anybody knew a piston that matched up at the right deck height and wrist pin diameter. Thanks
 
Pin Diameter and deck height will be the same if you are using an M rod, crank and piston"s you will just need to size the bore if your M engine was sleeved to 4" the OD should be somewhere in the 4 1/8" Dia with a step at the top you should be able to run a regular 4 1/8 after insuring that tolerances are acceptable. Remember that in the life of the M-SM-400-450 there were 2 different pin sizes
 

If you want to just pull the sleeves and give it a decent hone job you can run 281 pistons from a 400/450. You will need to have a machinist make a set of rings to fill in the step where the lip on the on sleeve set, but that shouldn't cost very much at all, maybe $50-100. I had a set made for $40 but that was 5 years ago , with me supplying the metal, now I have my own lathe so I don't know the exact cost for those today.
 

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