I'm finally getting my HP273 back together. I bought this engine for $225 a while back and have been getting it into shape. The engine was rebuilt around 1980 or so and run very little. The crank, pistons, cylinders, etc were all in nice shape, but there was a fair amount of carbon and sludge inside so the engine was completely torn down and the block jet washed. I'm reusing the pistons, rings, the upper bearing main bearings and the rod bearings. I had an extra set of .010" undersize mains so I stole the upper main shells and used them as lowers so I have fully grooved mains. I polished the tops of the pistons in hopes of making more power and collecting less carbon. A thermal coating would have been better, but this is a budget build. The cam was a wimpy Crower hydraulic that's getting replaced. The factory style domed pistons are forged. I have a feeling the engine wasn't used much as it likely pinged due to the high compression ratio and short duration cam. The exhaust guides were worn so they were replaced with bronze and both intake and exhaust guides were machined for positive seals. I also sprung for hard exhaust seats. It's too bad these 273 heads have such a lousy exhaust short turn, but that's the breaks.
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