the last year of production at GM's Norwood, Ohio, facility as sales continued to decline consolidating Camaro assembly to the Van Nuys factory located in Southern California. 1988 The Camaro line was greatly simplified this year, starting with discontinuing the slow-selling LT model, and dropping the base Z28. The IROC-Z package proved popular and the package became standard on Z28s. This resulted in two models remaining, the base coupe and the IROC-Z. Without the Z28 to bridge the gap between the base Camaro and the flagship IROC-Z, the previously standard aluminum 16-inch 5-spoke wheels were now an option - "base" IROCs now got the previous year Z28's aluminum 15-inch 5-spoke wheels (which also became standard on the base coupes) and P215/65-15 tires. Also, the old Z28's ground effects and spoilers were now standard on the base Camaro coupes. Base models received a new raised spoiler for the first half production year. All engines were fuel-injected this year; the 2.8 (173) running 135 HP at 4,900 rpm and 160 lb.ft at 3,900 rpm, the 5.0L 305 cid V8 gained throttle-body injection, bringing net horsepower to 170; the 305 cid TPI manual transmission models were rated at 220 HP at 4,400 rpm and 290 lb.ft at 3,200 rpm, Automatic at 195 HP at 4,000 rpm and 290 lb.ft at 2,800 rpm and the 350 cid TPI got a small boost to 230 HP at 4,400 rpm and 330 lb.ft at 3,200 rpm. G92 (performance axle ratio) available only on IROC-Z with 5.0 TPI (LB9). All 1987 350 TPI L98 IROC-Zs came standard with the 3.27 BW rear end and everything that was included with G92 but did not have the G92 RPO code because it was not mandatory; this changed in 1988 however when a 2.77 rear was standard and G92 had to be specified to get the 3.27 differential. The IROC-Z was also treated to some small cosmetic changes. The "Z28" logos on the ground effects below the doors and on the rear bumper changed to read "IROC-Z". The large IROC-Z call-outs on the door moved from the front of the doors to the back, to put some space between the logos. Option code DX3 offered buyers the option of deleting the IROC-Z's door decals and stripes for a $60.00 credit. Optional 16-inch aluminum wheels were redesigned with two lines instead of one large line in each spoke, and center caps