Holly Jets vs Demon Jets size's clarification

I need to know if this is a TRUE FACT........

Don at FBO was telling me yesterday that Holly Jet sizes are SMALLER than Demon Jets............

Example:

Holly Jet that is a 84 would be an 81 in Demon sizing............So if you were going to JET the Demon UP 3 sizes using HOLLY Jets you would need to use an 87 HOLLY JET which would be 6 sizes bigger to get 3???

This would be pretty BOLD to just say without having the information to back it up.................

Can somebody Clarify this?????



here are the holley jet sizes if ya ever need them..