1985 was an important year for engine improvements. First, the 2.8 received "Multi-Port Fuel Injection," which replaced the engine's 2bbl carb. This boosted power from 107hp to 135hp. The other engine devlopment for '85 was the introduction of GM's "Tuned Port Injection," named for its tuned-length intake runners. There was a price to be paid however for choosing the TPI in '85...it was only available with the 700R4 automatic trans.

The other major news for '85 was the introduction of a new option package on the Z28s. The B4Z "IROC Sport Equipment Package" was named in honor of Chevrolet's sponsorship of IROC (International Race of Champions). Chevy decided to add to the flair of the Z28 by using the IROC name.

Standard IROC equipment included these improvements on the standard Z28: 16x8 inch 5 spoke rims, P245/50VR16 Goodyear Eagle VR50s, 1/2 lower ride height, special front struts, springs and jounce bumpers, Delco-Bilstein rear shocks, special rear springs and larger stabilizer bar, higher effort steering and increased front frame rail reinforcement.

Other improvements for '85 included a revised interior on all models. New colors and the deletion of the "double needle" speedometer headed the improvements. Also, the Z28 received revised ground effects, a deeper front air dam, revised tailights and new, louvered hood inserts.

Standard Sport Coupe: LQ9 2.5 litre EFI four, 88hp (3,318 produced)

Optional Sport Coupe, Standard Berlinetta: LB8 2.8 litre MPI V6, 135hp (78,315 produced)

Optional Sport Coupe, Berlinetta, Standard Z28: LG4 305 4bbl V8, 155hp (63,052 produced)

Optional Z28 and IROC: LB9 305 TPI V8, 215hp (32,836 produced)

Optional, IROC: L69 305 H.O. 4bbl V8, 190hp (2,497 produced)

1985 was a landmark year in 3rd Generation Camaro production. Both the IROC package and TPI engine showed the future of Camaro performance. Plus, the MPFI setup on 2.8s finally allowed the V6s to have somewhat-respectable performance, and have proved to be a very durable engine that responds well to modifications.