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SC3 in OEM sizes are probably a harder compound vs other sizes as GM says they are specific to the SS 1LE and ZL1. I've seen 19" SC3s heat up faster vs OEM 20" sizes.
My results with OEM SC3s follow the weather. You can't easily get them hot enough. On track they work well on very hot days and don't fall off much after 20 min.
I've been considering buying SC3s in ZL1 1LE sizes and using them for both AX and track, but a friend has some 18s he'd sell me and then I could run 295/35/18 RE71RS, which would be faster for AX for sure but I just don't need another set of wheels.
I've ran Falken RT660s since last year in 315/305/30/19 staggered setup and I like them a lot new but they fall off hard when half worn. I was just at Lincoln for MidDivs with 2/3rds worn RT660s and they simply never "turned on", my 1st runs were the best and even though they heated up after the 1st runs they just got a lot slower, which is the opposite of how they behave when new. I was pretty unhappy with that and don't want to buy more RT660s. I can't afford to spend the cash on tires that heat cycle out so quickly.
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