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factory were 195º

yes for emissions control.160 for drag racing. 180 is better for fuel atomization & I would drill a 1/16" hole roughly halfway between the outer edge & the center.takes only several minutes & saves ALOT of time by bleeding the trapped air out as you are filling it & can help elimate hidden trapped air pockets. One guy jacked up the front of his car which burped it like a baby which fixed his until that point unfixable overheating problem which was a trapped air pocket(s).

live every 24 hour block of time like it's your last day on earth