I have a 3/8" phenolic spacer and Holley heat shield. My K&N air filter is I think a 1 3/4". If you look close, I had to grind off part of the back of the air cleaner since it hit the inside of the hood. I also put grade 8 bolts through my motor mounts ( left them slightly loose with silicone on them to keep them from moving around) in case they ever cut loose.
