I have a '92 Camaro with radials. the tire are Goodyear GTII'd 235/55R16. What is the best tire pressure front/back for the drag strip?

 

Radials don't like low tire pressure. By lowering the tire pressure, the stiff sidewalls will cause the center of the tread to rise up causing less traction.

You can pump up the fronts to around 35 psi to decrease the rolling resistance.

Keep the rears between 30 and 35 psi.

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87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley