I own a 1986 IROC-Z with 36,500 miles on it. It is all stock, has the 305 carb LG4 which is nothing too special. But it has 5-speed, 4 wheel disc, posi traction, cloth interior, no ac, no power windows, no power locks, power steering, and power sport mirrors. It also has the optional 145 speedo, and ERS sound system. Ever single car show I go to I try to find something remotely close but it seems hard, I'd just like to figure out how many where made like this.

 

Please read my post titled, "Notice to All Concerning Production Figures". It will explain about option combinations and the fact that Chevrolet did not keep records of multiple option combinations.

When dealerships order cars for their stock, they usually order the most common options and very rare to see a vehicle equipped like yours on the lot. It sounds as though your car was originally a specially ordered vehicle built for a specific buyer, not for dealer stock. Check your RPO codes for a 1AZ. This signifies a customer ordered vehicle.

The 145-mph speedo made its introduction in late 1986 Z28's with TPI. It never came originally on carbed Camaros. So your speedo has been changed from the original 85-mph unit.



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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
12.57 @ 111 mph.
12.04 @ 114 mph (50-hp nitrous).
http://www.ozemail.com/au/jca69/mods/williesz/willie.html

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.