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Holley Choke Tower Removal - Worth it? #1167782 01/29/12 04:00 PM 01/29/12 04:00 PM
Joined: Jul 2006 Posts: 4,319 Puyallup, WA S StealthWedge67 OP master
StealthWedge67 OP master S Joined: Jul 2006 Posts: 4,319 Puyallup, WA	How much is to be gained by removing the choke tower on my 830cfm race series double pumper? It's on a 452ci. street/strip big block that I shift at 6500. I'm currently fabbing a cold air induction system, and wonder if I should make this mod to my carb. Hood clearance mandates a drop base and 3" element, so the choke tower is fairly close to the top of the air cleaner. I have a cutting wheel and die grinder, so I think I could pull it off, but I've never done this. Thoughts?.... LemonWedge - Street heavy / Strip ready - 11.07 @ 120

Re: Holley Choke Tower Removal - Worth it? [Re: StealthWedge67] #1167783 01/29/12 04:08 PM 01/29/12 04:08 PM
Joined: Oct 2004 Posts: 5,620 long island NY A Ari440 master
Ari440 master A Joined: Oct 2004 Posts: 5,620 long island NY	use hachsaw to cut it , take your time cutting it strait , take the main body off and put it on a vise two cuts next to the vents going down and two cuts across to cut the airhorn off use wd40 when cutting with the diegrinder clean up the cutting you did its worth 25-30cfm 1.39 9.85 - 137 mph

Re: Holley Choke Tower Removal - Worth it? [Re: StealthWedge67] #1167784 01/29/12 04:11 PM 01/29/12 04:11 PM
Joined: Oct 2010 Posts: 2,408 Ambridge, Pa. R rickraw top fuel
rickraw top fuel R Joined: Oct 2010 Posts: 2,408 Ambridge, Pa.	i had the same problem years ago. don't know the cfm gain, might be some. i just cut it all off & blended it all in real smooth. seeya.

Re: Holley Choke Tower Removal - Worth it? [Re: rickraw] #1167785 01/29/12 04:17 PM 01/29/12 04:17 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I have been wondering if its worth it on my 850 DP ? Ron

Re: Holley Choke Tower Removal - Worth it? [Re: 383man] #1167786 01/29/12 04:20 PM 01/29/12 04:20 PM
Joined: Oct 2010 Posts: 2,408 Ambridge, Pa. R rickraw top fuel
rickraw top fuel R Joined: Oct 2010 Posts: 2,408 Ambridge, Pa.	only way to find out would be to have it flow tested before & after. seeya.

Re: Holley Choke Tower Removal - Worth it? [Re: 383man] #1167787 01/29/12 04:40 PM 01/29/12 04:40 PM
Joined: Jul 2004 Posts: 19,318 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,318 State of confusion	Quote: I have been wondering if its worth it on my 850 DP ? Ron YOU my man need a 1050 dommy on that beast. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: Holley Choke Tower Removal - Worth it? [Re: Thumperdart] #1167788 01/29/12 04:46 PM 01/29/12 04:46 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: Quote: I have been wondering if its worth it on my 850 DP ? Ron YOU my man need a 1050 dommy on that beast. Yes as I would love to try one some time when I can get my hands on one. Ron

Re: Holley Choke Tower Removal - Worth it? [Re: 383man] #1167789 01/29/12 04:48 PM 01/29/12 04:48 PM
Joined: Jul 2004 Posts: 19,318 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,318 State of confusion	Agreed..............never seen a good powerfull motor NOT pick up. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: Holley Choke Tower Removal - Worth it? [Re: 383man] #1167790 01/29/12 05:20 PM 01/29/12 05:20 PM
Joined: Feb 2005 Posts: 4,321 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,321 Prospect, PA	Every combo is different so I would think the results would vary. I removed the air horn from my 4781 and added transition radius plate as shown in the pics. I thought for sure that it would pick the car up a bit, but I really could not find it in et or mph.

Re: Holley Choke Tower Removal - Worth it? [Re: StealthWedge67] #1167791 01/29/12 06:10 PM 01/29/12 06:10 PM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	Quote: How much is to be gained by removing the choke tower on my 830cfm race series double pumper? It's on a 452ci. street/strip big block that I shift at 6500. I'm currently fabbing a cold air induction system, and wonder if I should make this mod to my carb. Hood clearance mandates a drop base and 3" element, so the choke tower is fairly close to the top of the air cleaner. I have a cutting wheel and die grinder, so I think I could pull it off, but I've never done this. Thoughts?.... on a 830 going to 1 3/4" throttle plates and a contoured body would help cfm a little. holley rates a 1 9/16" venturi contoured body with 1 3/4" throttle plates at 1000cfm. thats probably a "happy" number. real world may be 900cfm. if you whack the existing body do what the brown charger guy did and add the big throttle plates.

Re: Holley Choke Tower Removal - Worth it? [Re: 383man] #1167792 01/29/12 07:20 PM 01/29/12 07:20 PM
Joined: Mar 2005 Posts: 3,152 Central NC gch master
gch master Joined: Mar 2005 Posts: 3,152 Central NC	Quote: I have been wondering if its worth it on my 850 DP ? Ron When Jesse at Bigs did my 850 I asked him thid and he said it was'nt worth it as the tower was shorter on the 850 vs the smaller carbs. I did it on my 750 vac sec and it helped the et and mph a little. Now if I were going with a drop base and cutting airflow off from the engine I would definitely do it. Switching to an HP series carb with the contoured entry would be the next step. Last edited by gch; 01/29/12 07:21 PM.

Re: Holley Choke Tower Removal - Worth it? [Re: gch] #1167793 01/29/12 09:06 PM 01/29/12 09:06 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	just spend a few bucks and pick up a proform mainbody

Re: Holley Choke Tower Removal - Worth it? [Re: Quicktree] #1167794 01/29/12 09:47 PM 01/29/12 09:47 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Quote: just spend a few bucks and pick up a proform mainbody After gutting my carb also like others have, I didnt want to chop up my new 800 cfm Holly. I bought the $99.00 Proform carb body, witch is a much better design on all 4 barrels. Still the gain wasnt all that much. Either keep the gutted choke tower or buy the ProForm body. Dont ruin the choke tower carb, its not worth the effort, IMO mike

Re: Holley Choke Tower Removal - Worth it? [Re: Sport440] #1167795 01/30/12 12:23 AM 01/30/12 12:23 AM
Joined: Jul 2006 Posts: 4,319 Puyallup, WA S StealthWedge67 OP master
StealthWedge67 OP master S Joined: Jul 2006 Posts: 4,319 Puyallup, WA	I don't think Proform makes a main body for my carb. 830's have 1-11/16" throttle plate bores with 1-9/16 venturis. I called proform, and the main body that they have to go with the 1-11/16 plate bores is a 750 body, and actually has smaller venturi bores than my 830 does. Anyway, I went ahead and took the tower off. Easier and quicker than I thought. About 2 hours and the carb was back together and on the car. I normally wouldn't have done this, but with a drop-base air cleaner, the tower really creates an issue. My hope is that with the cold-air system, and this small mod, I can put myself in a position to claim an 11-second timeslip. 7043697-4778830cfmDP.jpg (439 downloads) Last edited by GEnsrud; 01/30/12 02:12 AM. LemonWedge - Street heavy / Strip ready - 11.07 @ 120

Re: Holley Choke Tower Removal - Worth it? [Re: StealthWedge67] #1167796 01/30/12 04:51 PM 01/30/12 04:51 PM
Joined: Dec 2011 Posts: 27 ohio T top comp member
top comp member T Joined: Dec 2011 Posts: 27 ohio	if you remove it and don't see any gain,it's because you have somthing else holding it back( scoop,timing,jetting,etc) there should some small gain ,no mater how small.test done by holley back in the early showed 15 to 20 cfm gain

Re: Holley Choke Tower Removal - Worth it? [Re: StealthWedge67] #1167797 01/30/12 08:42 PM 01/30/12 08:42 PM
Joined: Jan 2003 Posts: 4,101 Shelby Twp. Mi HardcoreB master
HardcoreB master Joined: Jan 2003 Posts: 4,101 Shelby Twp. Mi	Quote: My hope is that with the cold-air system, and this small mod, I can put myself in a position to claim an 11-second timeslip. I would try walking-in the secondaries slower with cam tuning

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