Just replaced a set in a Merlin Big Block for a customer. They had been run for a full season and looked like new. 900lb open pressure roller. We had to take them out to do some machining on the block, otherwise they would have stayed there for another couple of hundred runs.
Do you need them for a stock engine ... no. Mild race ... still no, even though the better Durabond HP bearings might not be a bad idea for a couple of dollars more. Just depeds a lot on the srping pressure you are planning to run.
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