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Carb Spacer, idle, cam questions, Sniper

Old 07-01-2020, 08:23 PM
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Default Carb Spacer, idle, cam questions, Sniper

Just had some new carbs built and unfortunately they werenít perfect out of the box so Iím experimenting. I tried to switch to 4150ís but they were insistent they could make new dominators work. Iíve adjusted them some but at this point not happy that my idle speed is 900-950 and they still stall out if you arenít quick on the throttles even if you richen up on the corners a bunch!

565ís,
CAM specs are 264/270, .445/.445 114 LC

im going to experiment tomorrow, but does anyone have thoughts on whether the spacer could be causing me to lose Signal at idle? What about exacerbating a lean problem with more plenum volume?

any thoughts on how much the secondary idle screw should be opened? Iíve been told that opening that at the same rate as the primary can actually cause a lean condition so adjust idle speed exclusively on the primary Side.


would the Holley sniper system Solve my problems? I was going to head that direction but ran out of time to have bungs welded in and switch to electric fuel pumps. Is it smart enough to manage the idle in and out of gear?



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Old 07-01-2020, 09:06 PM
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being a four corner idle system you do need to open both front&back barrels evenly,if you leave the secondary closed it won,t idle worth a darn.if this is a new gen3 dominator it has an air bleed that is adjustible by turning a screw under where the air cleaner stud goes.the instructions that come with a gen 3 dominator carb cover it pretty clearly.
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Old 07-01-2020, 09:40 PM
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Originally Posted by seafordguy View Post


would the Holley sniper system Solve my problems? I was going to head that direction but ran out of time to have bungs welded in and switch to electric fuel pumps. Is it smart enough to manage the idle in and out of gear?
Extremely well.
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Old 07-01-2020, 09:47 PM
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Originally Posted by mike tkach View Post
being a four corner idle system you do need to open both front&back barrels evenly,if you leave the secondary closed it won,t idle worth a darn.if this is a new gen3 dominator it has an air bleed that is adjustible by turning a screw under where the air cleaner stud goes.the instructions that come with a gen 3 dominator carb cover it pretty clearly.
They are brand new. Iíll go online and find instructions on the air bleed. Any thoughts on spacer mike?

Originally Posted by ICDEDPPL View Post
Extremely well.
Dan - i was going to reach out to you on the snipers. Iíve followed your threads on it (including the recent surge thread). I think this is the way to go, but wanted to salvage my early summer so went fresh carb route.....
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Old 07-02-2020, 01:10 AM
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I can understand that .
I`m running the terminator stealth, makes install easier because all my throttle linkages stayed the same.
Plus external ecu.. I believe the Sniper is internal?
They do make a 4500 series Sniper Stealth that supports a ton of power .
Holley has a ton of ways to skin that cat .
Since tuning I`ve never had an engine die on me while shifting , even in 46* weather with almost no warm up .
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Old 07-02-2020, 07:13 AM
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Originally Posted by seafordguy View Post
They are brand new. Iíll go online and find instructions on the air bleed. Any thoughts on spacer mike?



Dan - i was going to reach out to you on the snipers. Iíve followed your threads on it (including the recent surge thread). I think this is the way to go, but wanted to salvage my early summer so went fresh carb route.....
A 2Ē open spacer may kill a little , but a 1Ē not really, nor any height blended spacer.

You have enough initial advance ?

Mike Tkach provided good info above.
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Old 07-02-2020, 07:37 AM
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Are you sure its a lean problem ?
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Old 07-02-2020, 11:00 AM
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So, I just pulled it off and rechecked where I’m at.

A. Disappointed that I bought brand new carbs and they don’t have the idle bypass feature. Weird.
B. I’ve got disparity between the front idle screw and rear, but the primary butterflies are open far enough that a lot of light is coming through. Maybe close to 1/16”.
C. From below it doesn’t even appear that the transfer slots are even exposed (trying to baseline the 0.02 slot square). So when I open the idle speed up its as if it immediately exposes the entire slot.

ill go back out in between conference calls.

fbc - now I’m not so certain that they aren’t pulling too much fuel.......
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Old 07-02-2020, 11:01 AM
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SB - I think I have timing locked at 32*
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Old 07-02-2020, 11:47 AM
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Does it have a transfer slot restrictor, Is the idle feed restrictor in the lower position, Is it a 2or3 circuit.
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