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Message: <blockquote data-quote="reivaxtorres" data-source="post: 197701" data-attributes="member: 8890">interesting. is the low and high readings on the stock gauge? (i mean what letters/area of the gauge relates to what temp?)i think ill swap out the t-stat just to be sure, but i know it opened when i did the head swap because i filled the tank, left the cap off, turned on the car and let it sit for awhile, then i heard it open and saw all the coolant from the tank disappear pretty damn quick. filled it up and thought everything was fine. like i said tho, ill replace it just for good measure in the next few weeks. if the t-stat doesnt open tho, how does the coolant in the block/heads/intake cool off, since its not moving thru the radiator?i thought the 2v and 4v 4.6L water pumps were the same? just either longer or shorter, but ill look into this. i know the 03/04 cobra uses the same pump as the 96-01 GT does.and yes, im running 91 octane on the stock tune. had been running it for about 2 tanks before i did the swap, and then i had to fill it up when i was done with the swap. like i said tho, driving it around normally, it doesnt move beyond the "R" of normal, its only when im pushing it really hard that it moves past the "A" and into the "L" territory.</blockquote>