I can't imagine the relatively small amount of foam in the tank compartment would assist much in keeping a 21 afloat if swamped...certainly not if it's saturated...if foam at all, I'd follow Thacker's advise, but personally would find better way to secure the tank, leaving the foam out...MHO...
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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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