Banshee welded crank
#2
When your engine starts making more hp, you need to weld the crank to be sure it doesnt come apart on you. It doesnt add hp, its a reliabilty move. They weld the journal where the pin is conected to make sure it will not come apart(sling a rod). Usually you dont have to do this until you have added enough compression to run race gas, but it is a good idea to do it anyway.
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