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Hello Fleetwin,
My company has a good accurate pneumatic gage (I think +/- 0.05 psi). I have verified my compression gage against this gage to be sure my compression gage to be accurate as well. My power head does not show a overheat since there is no discolored on the head and the block. But the head is different color from the block so the previous owner had changed the head! I am very tempting to get this block on the Ebay since it has an impressive 105 psi. Wow it looks like very good compression for 9.5 Hp. It is $75 but the shipping is a killer ($74). I am in Canada and live near the border so I could buy and ship to my friend house in US and just come over on the weekend to pick up. If this power head has truly 105 Psi, should I just swap to mine and will have a good motor for long. What do you think?
Here is the e-bay link