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All H models were a 3.375 stock bore, with a 1.109 pin, and a compression height of 2.5 inches. Overbore was opened up to 3.4375 by using a thinner sleeve set. I belive the block bore with no sleeves is 3.55. Super H had a 3.4375 bore stock, the OD of the Super H sleeve was now 3.755, but still retained the small counterbore flange spec. Overbore for the Super H was 3.5 for early Super H,,,, but, after a certain serial number, they used the same sleeve as the 300's C-169ci option to go to 3.5625 bore. I would imagine to see these blocks,,, it would have to be a stage 2 Super H with live hyd, battery under the seat models. None in early 54 or any of the 53 Super H was like this.... Still 2.5 compression height, same 1.109 pin, but the firecrater option was now the best power addition to that engine, and still is a great option. C-175 engines, and late C-169 engines, and most common for a rebuild will be a small pin, .875 pin, option which is a lighter weight option if C-175 rods are used, but in a SH or 300 with H-300 rods used,, the adapter bushing used is kinda heavy. But its a simple conversion available in most kits. C-175's used a 3.625 bore, 2.5 compression height with a .875 pin was most common. H blocks can be bored to fit in the 175 sleeves. Its a cheap option to do, a nice power upgrade, even some small stroker options at 3.625 bore! We have a kit that makes a 350 into a "Super 350" if such a thing existed. Hope this info helps. But if your looking for aftermarket big bore kits,,, know where to get those too and will point you in the right direction. ChadS
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