A 235 block crack in the driver's side water jacket. A slow weep of coolant.
Patch job with fingers crossed: Drain coolant into buckets/containers. Drill small holes above and below the crack into the water jacket to stop crack spreading. V-groove the crack to expose more area. Steel brush the block to remove rust and loose particles. Work JB weld into the holes and groove. Cover JB Weld with plastic wrap. Wedge a block of wood to hold JB Weld and plastic wrap in place against the block. Allow to fully cure. Remove wood block and peel off plastic wrap. Pour coolant back into radiator. 2010 to 2022 and still counting.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
