Several boat mfgrs are leaving core material out all together and molding a hollow stringers...l imagine some critical engineering goes into this to do it successfully, but my point is if the stringer side-walls and existing joints where the stringers meet the hull are still intact, the core material isn't the structural factor once thought...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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