i know this has been asked before but i am confused. temporarily...
what is the first # and what is the sencond#
higher number is thicker?
first # is warm
second # is cold or w for winter is this
right..?


365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured
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