milling choke/cfm change

rod · 01-29-2010, 01:07 PM

what kind of cfm change can i expect by milling the choke horn off of a 650 DP holley?
thanks rod

buzzinhalfdozen · 01-30-2010, 07:46 AM

Well I,m certainly not a carb expert but I,m quite sure you wont change the CFM one bit by milling off the choke horn, you will however change the way the air enters the carb. Joe

Bill Baer · 02-10-2010, 06:38 PM

Rod
From what I have read it's not much (2-3 CFM).
However I have read and experienced that a K&N stub stack will help pick up the air flow of any carb especially if you machine it to fit inside a conventional velocity stack.
Note the K&N stub stack does not require any machining,it's a bolt on and will help all by it's self.
Hope this helps

01-29-2010, 01:07 PM	#1
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 306 Likes: 0 Liked 17 Times in 13 Posts	milling choke/cfm change what kind of cfm change can i expect by milling the choke horn off of a 650 DP holley? thanks rod

01-30-2010, 07:46 AM	#2
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 985 Likes: 0 Liked 12 Times in 9 Posts	Re: milling choke/cfm change Well I,m certainly not a carb expert but I,m quite sure you wont change the CFM one bit by milling off the choke horn, you will however change the way the air enters the carb. Joe __________________ Joe Buchanan SS/BX 3117

02-10-2010, 06:38 PM	#3
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Re: milling choke/cfm change Rod From what I have read it's not much (2-3 CFM). However I have read and experienced that a K&N stub stack will help pick up the air flow of any carb especially if you machine it to fit inside a conventional velocity stack. Note the K&N stub stack does not require any machining,it's a bolt on and will help all by it's self. Hope this helps __________________ Bill Baer 3391 SC, 339B SC, QR