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			i have the ls1 brakes on my vert, 15 will not clear at all, 16s barely do but, yes you will have to use 16s to use them.
		 
				__________________87 Trans Am 5.7, Auto, posi disc rear, flowmaster muffler, all org car.
 88 Iroc-Z TPI, Cammed 350, Vortex Heads, Magnaflow, T5, 4 Wheel Disc, 3.27 9 Bolt PBR.
 91 Trans Am VertTPI 350. 700r4, K&N Air Cone, Ryven Muffler.
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