Engine Quest CH350I Cast Iron Heads
The data on this page is for information only. We no longer supply or work on the Engine Quest 350I heads.
The stock EQ-350I cylinder head is a good basic cylinder head from a mechanical stand point. From a performance standpoint, on a typical circle track car, there is a ton of room for improvement.
If you want to run in the middle of the pack, bolt on a set of these heads without improving the air flow. If you want to run upfront, “Undercover Porting” is the way to go.
Stock EQ-350I heads flow 215 cfm intake and 154 cfm exhaust. With our “Undercover Porting” the flow numbers increase to 237 intake and 175 exhaust. This air flow improvement will typically add close to 20 horsepower to your 355 small block running a 500 Holley 2 barrel carb.