"Smaller engines have to work
"Smaller engines have to work harder to get the same performance as larger engines. This means higher rpm for a given cruising speed, more noise, more wear and tear on the engines and running gear, and sometimes poorer fuel economy. Top speed will be lower. On the plus side, they're lighter, less expensive to buy and maintain, and might offer better fuel economy if they're not overtaxed.
We all have a favorite cruising speed. If, for instance, yours is on-plane at moderate speed, then when you're sea trialing the Tiara, put the boat at that speed and leave it there for awhile. How are the rpm's? How's the noise level? Can the boat handle a good chop at that setting or do you need more or less speed? How heavily will be boat be loaded? Figure the fuel consumption at that rpm and load. Is there enough reserve power to let you outrun a storm?
The value of the boat should reflect the smaller engines. If most Tiara 31's have big block V8's, then there is a risk factor of less desirability on resale. Your purchase price should take this into account.
This isn't a complete list, but if things like these are acceptable to you, run the 350's and be happy.
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