Thanks for pointing that out. This is definitely a common thing. If you have a vac leak you can't seem to find (anyone with these intakes) try taking the carb off and checking the holes. This is an Edelbroke thing. I have an intake that did this with a big spreadbore Holley and I fixed it with a small hex plug and some teflon tape. There are 8 bolt holes, not 4 so you have to check all 8. 2 were vacuum leaks. Seen a few like this, and I don't even see many of these intakes so this is going to come up again.