Originally Posted By krautrock
if you google holley 172 and 173 blades i think you will find they are actually 1-11/16" blades, i'm going by memory so i could be wrong.

I think you might be right too. Today I had a friend with Holley knowledge take a look at it. He says removing the rear power valve or replacing rear metering block is an old drag racers trick to allow use of even bigger secondary jets or something like that. He also said he believes the carb is an 800 cfm. ??? I got it installed and dialed in and my built 440 absolutely loves it!

Last edited by Bunk; 12/30/16 04:04 AM.
The beginning of knowledge is the fear of GOD.