I have 245 set up in the front and 275 in the rear. It gives a good amount of traction and it is still has enough space to not rub. But I was being conservative. You can push (without raising your car) maybe until 305 in the rear ? but that is my opinion alone.
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Specs
TSP Stage 2 Boosted Cam 227/235 at 114 LSA
Fore Innovation Triple pump staged (Walbro 342 primary and 2x Walbro 450 secondaries)
Procharger D1x with a 3.85 pulley
ID1050x Injectors
Flex Fuel Sensor
Monster LT1 Twin Disk Clutch
Holley Sniper Efi Intake Manifold
NW 103mm Boosted TB
747rwhp at 12psi on E85
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