at 4,400 and 330ftlb at 2,800. All V8 engines received hydraulic roller lifters and a new valve cover/head design. Valve covers featured new sealing and center bolts in the valve covers. Heads featured a new raised lip for improved valve cover sealing and the two center intake bolts were changed from 90-degree orientation to 72 degrees. G92 and L98 cars got the Borg-Warner HD four pinion rear end, produced for GM's Holden of Australia (Firebird WS6 cars went to this unit in 1986). These units can be identified by their 9 bolt (rather than 10) differential cover that has a rubber drain plug. The Borg-Warner logo is also cast into the bottom of the differential case. This rear axle came with tapered rather than straight roller bearings and a cone-clutch rather than disc-clutch limited-slip unit. These units came painted black from the factory while most others were bare metal. All 1987 350 TPI L98 IROC-Zs required 3.27 gears, J65 rear disc brakes, G80 limited-slip differential, and a KC4 engine oil cooler. The largest visual change this year was the CHMSL (third brake light) was now mounted inside the rear spoiler instead of on top of the rear hatch (except the base coupe without the spoiler option - on those cars it remained on top of the hatch like the previous year). The Berlinetta was no longer available this year, replaced with a new LT model, while the base Camaro and Z28 continued as before. speedometers became standard in the IROC-Zs and Z28s with tuned port injected engines while the carbureted Camaro models and 2.8 liter V6 retained the 85 m.p.h. speedometer. Other changes included a Camaro convertible that was introduced for the first time since 1969 as a regular production option. Available on the Sport Coupe, LT and IROC-Z, the conversion was performed on t-top equipped Camaros by American Sunroof Company (ASC). A total of 1,007 were produced in the first year of production. The 1987 model year marked the 20th anniversary of the Camaro and the convertibles were considered the anniversary editions and included a dash badge that read "20th Anniversary Commemorative Edition". Some 1987 T-Top models were made into convertibles by ASC after the customer took delivery. This is why there are some convertibles with the body VIN code of 2, meaning they were coupes, not convertibles (which have a body VIN code of 3). This was also