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Author
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Topic: Milling choke horns?
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32valveGT350
Gearhead Posts: 124
From: Briz Vegas, QLD, Australia
Registered: May 2003
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posted 12-16-2004 08:18 AM
  
What will milling the choke horn on a 750 vac sec do to the jetting? The engine spec is:
351C, .030" over
hypereutectic flat top pistons, 10.4ish compression.
CHI 185cc 3V heads, matching intake manifold (6.25" tall)
Holley 750 Vac sec (I think its got a 9.5 pv, 90ish main jets)
Cam is 218 degrees @ .050" lift, .519" max lift, 276 advertised duration, 110 centres, 2 degrees advanced.
4 into 1 longtube headers, 2 1/4" twin system.
Basically, I want to mill the choke because at the moment the K&N XStream lid sits on the choke tower due to the drop base in the shaker and the need to get the shaker under the hood...... It was dyno tuned with *no* air filter setup, and is rich with the filters in place... Can I safely just mill the choke and leave the jetting?Ben
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 12-16-2004 12:23 PM
As a rule of thumb, the proceedure gains about 50 CFM of air flow.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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32valveGT350
Gearhead Posts: 124
From: Briz Vegas, QLD, Australia
Registered: May 2003
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posted 12-16-2004 06:46 PM
But what does it do to Jetting?
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 12-16-2004 06:58 PM
quote:
Originally posted by 32valveGT350:
But what does it do to Jetting?
It doesn't do anything.
In theory, if you increase the air flow, you should need to increase the fuel supply.
It all depends on how close you are now.
You may not need to do anything to your jetting at all.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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32valveGT350
Gearhead Posts: 124
From: Briz Vegas, QLD, Australia
Registered: May 2003
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posted 12-16-2004 08:32 PM
Thanks, I'm not hugely experienced with Holleys... could make a good gues at how I'd have to change the jetting in a Mikuni flat slide though.... lol
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