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Even N/A, I don't think block reliability will be an issue. Even open deck, I can't imagine you having a problem holding 250WHP in the block.
Sleeves are needed on the 4B11T around 700 WHP/500 LB-FT of torque
Sleeves are needed on the 4B11T around 700 WHP/500 LB-FT of torque
