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The 1985 stock 305 TPI was rated at 215 horsepower. The 1986 had a milder cam and slighty less horses, I belive 205. Correct....the HP is rated at 215, but it produces a lot of torque. A quick way to add about 15 hp is to install an air foil for about $70.00. The air foil installs where the hose connects to the air intake on the engine. It's a quick and easy install. I added a Flowmaster catback exhaust and K&N air filters and a hyperchip. Not impressed with the chip. The Flowmasters and K&N filters did much more than the chip. Engine runs much cooler.

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15y ago
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Q: What is the horsepower of a stock 1985 IRoc Z28 with 305 TPI and what is the cheapest way to add more?
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