[barry950]

I had to cut the aux. venturis down to match the 1" air horns necessary for hood clearance on a 289 with 48 IDAs and De Tomaso cylinder heads. (similar to Gurney Weslake). There appears to be no adverse effect as the engine pulls strongly from 3000rpm to 6500rpm with no holes in the torque curve. It makes 369 lbs ft of torque at 5000, and 403bhp at 6200 on 93 octane fuel.