There used to be, that and for the 235 and 261 also. They had a kind of funny "lump" for a popup. But, with a dipper motor and only main bearing pressure oiling (and only FOUR main bearings), it would be better/cheaper/smarter to step up to a full pressure 235 or 261. Even better would be to swap to the 7 main bearing style 194-215-230-250-292 style of later six. I just happen to have an almost complete conversion kit (have the flywheel and clutch ***embly, the adapter itself, the Powerglide starter motor adapter ring, throwout bearing and fork, I just have to collect all the fasteners) to put one of those sixes, or even a V-8, up against a stock 41-54, 3-speed manual transmission. To do the V-8, the firewall has to be beat all to heck, and you lose the parking brake ***embly. Not a problem with the late six. More power, full pressure modern oiling, SEVEN main bearings, and lots of hopup parts available. I also have a Clifford 4 barrel intake and tube headers for the same sixes. I could probably make you a heck of a deal. I even have a couple of 250 sixes. I am Butch/56sedandelivery.
All these guys are right. But to answer your question. Check with Ross. They advertise 235-261 pistons.
Like Rich said - Ross makes pop-up pistons. They made these, then the owner modified them for more compression, especially seeing as thought they were flycut for valve cleanance
Ross, Egge, JE all would be good places to look. Or you could just hang a hair drier or baby huffer on the stock compression motor.
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