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You can choose between flat-top (left) or dished pistons for your 445. With 72cc heads, the dished versions provide a very pump gas-friendly 9.8:1 compression ratio, while the flat-tops bump this by a full point to about 10.8:1. It's best to discuss your application with Survival. The pistons used are sourced from either Probe or Diamond and, while both are quality forged pieces, the Probe versions are only available in 0.030-over size, so if you have any other bore diameter, you'll need to opt for the Diamonds, at about a $150 premium.