Holley IFR relocation (jmarkaudio or gnicholson) - Chevelle Tech
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post #1 of 23 (permalink) Old May 18th, 17, 12:02 PM Thread Starter
JIM
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Holley IFR relocation (jmarkaudio or gnicholson)

Mark or Gary,
Just be sure i have this right, I remove the brass restrictor from the upper outside holes that are drilled on an angle (circled in red) and tap the lower 2 straight holes circled in black for the new 6-32 x 1/8" set screws. Those 2 bottom holes are right next to another pair of holes that are drilled on an angle. I do not mess with the angled hole correct? Below is a picture of my metering block. Both of them are identical.
For the new set screws, I drill them to whatever diameter the upper ones are presently at?


Jim
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post #2 of 23 (permalink) Old May 18th, 17, 1:14 PM
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Mark Whitener
 
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

YEs, the bottom holes you can actually use either, I typically use the straight one going to the idle channel. If you have a bottoming tap start with 4 1/2 turns total, then test fit the set screw to make sure it threads in enough. If you don't have it more info at the links below.

racingfuelsystems.myfunforum.org - View topic - Relocating the Holley Idle Jet
Motorsports Village ? View topic - Two Circuit Holley Dominator Conversion
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post #3 of 23 (permalink) Old May 18th, 17, 3:10 PM Thread Starter
JIM
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

Thanks Mark,
Yes, I bought a 6-32 spiral cutting bottoming tap for the job. Also waiting for the #61-80 bit set to arrive that I ordered.
FYI,,, got a 50 set of 6-32 x 1/8 brass set screws from McMaster-Carr for under $5. Pretty good deal there.

Jim
My 70 Chevelle
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post #4 of 23 (permalink) Old May 18th, 17, 4:18 PM
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Gary
 
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

looks like you have everything covered
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post #5 of 23 (permalink) Old May 18th, 17, 4:28 PM Thread Starter
JIM
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

Quote:
Originally Posted by gnicholson View Post
looks like you have everything covered
Gary, yes, at least I hope so.
Just wanted to be sure before I start drilling and tapping stuff. Thanks for the phone support the other day as well. I appreciate your time given to me.

Jim
My 70 Chevelle
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post #6 of 23 (permalink) Old May 18th, 17, 5:30 PM Thread Starter
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

One last question... Pros/Cons to plugging the middle emulsion hole vs leaving it open in each metering block??

Jim
My 70 Chevelle
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post #7 of 23 (permalink) Old May 18th, 17, 7:26 PM
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Gary
 
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

if thats a factory block im a fan of leaving the factory emulsion configuration alone unless you are willing and able to do a lot if testing. i would refer to mark on this
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post #8 of 23 (permalink) Old May 18th, 17, 11:13 PM
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

#6? I thought it was #8?

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post #9 of 23 (permalink) Old May 19th, 17, 4:52 AM
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

Quote:
Originally Posted by Tom Mobley View Post
#6? I thought it was #8?
#6 if you're referring to the 6-32 thread, Tom.

Here's mine..
If you have a drill press (or a mill like I me) you can use an end-mill to spot-face for the IFR jet.
Be careful if using a drill press and use it's limiter so you can accurately control the depth of the spot-facing.


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post #10 of 23 (permalink) Old May 19th, 17, 5:35 PM
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Mark Whitener
 
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

6-32 is typical, 8-32 can be used as well. And on a 3 emulsion block either plug the middle or close the bottom two to .020
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post #11 of 23 (permalink) Old May 19th, 17, 6:48 PM
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Vinny Vince
 
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

What effect does moving these have? If it's an improvement why wouldn't Holley do this from the factory?

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post #12 of 23 (permalink) Old May 19th, 17, 9:44 PM Thread Starter
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

Quote:
Originally Posted by 69-CHVL View Post
What effect does moving these have? If it's an improvement why wouldn't Holley do this from the factory?
Vince,
See the 1st reply to this thread above by Mark. He posted 2 links. Look at the 2nd link (the motorsports village thread). Plenty of good reading/info there, but to answer your question, read page #6 of that thread and in particular the post by a guy with the username "shrinker". It explains the reason for the movement. Some of the Holley metering blocks already have the IFR's down there, some have them up high.

Jim
My 70 Chevelle
The 454
Keisler/LGT SS700 5-speed
Best ET 11.37 @ 121 Mph
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post #13 of 23 (permalink) Old May 20th, 17, 12:01 AM
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Tom Terrific II
 
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

yes, #6 and #8 threads on the setscrews. not really going to mistake a #6 setscrew for a #6 hose?

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Last edited by Tom Mobley; May 20th, 17 at 6:51 AM.
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post #14 of 23 (permalink) Old May 20th, 17, 10:35 AM Thread Starter
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

I modified the primary metering block.
Measured the existing upper IFR's to be .038". I removed them, drilled the set screws to .038" each and installed them in the lower holes.
Measured the e-holes to be .028" each so I took Mark's advice and plugged the center hole with lead shot.
If this all looks good, I will do the same to the secondary metering block. Let me know what you think.




Jim
My 70 Chevelle
The 454
Keisler/LGT SS700 5-speed
Best ET 11.37 @ 121 Mph
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post #15 of 23 (permalink) Old May 20th, 17, 2:28 PM
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Re: Holley IFR relocation (jmarkaudio or gnicholson)

from what i can see i would say you did a good job
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