4175 carb question
Thread Starter
Instructor
Joined: Jan 2003
Posts: 129
Likes: 0
From: Ontario ca
4175 carb question
ok so the carb is the same style as a 4175, the list number is 6210-3 or 4 im not sure because the airhorn was milled off, its a 650cfm double pumper. my question is what size jets should i have on the secondaires, the carb was converted from the old metering plate style to a metering block and im have no idea where to start. so what jet size would be equal to the stock amount of fuel flow when the carb had the metering plates? i have no idea where to start so any help would be greatly appreciated. if it helps its going on a 350 with a mild cam, headers, intake and msd ignition. thanks
Thread Starter
Instructor
Joined: Jan 2003
Posts: 129
Likes: 0
From: Ontario ca
Hey thanks for the help i realy just wanted somwhere to start at so some where between .086 and .078 is where i will start. i run a team g signle plane and I was womdering is it more important to stager your jets on a dual plane then it is on a single plane intake? any way thanks again for the help
Race Director
Joined: Oct 2000
Posts: 15,044
Likes: 79
From: central FL, near the beach.
i'd start w/ .088" Max Jet both, or #78 Holley jets
they say a single plane has less signal to pull fuel.(so i really don't know)
they say a single plane has less signal to pull fuel.(so i really don't know)
Last edited by Matt Gruber; Jun 22, 2005 at 07:14 PM.
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
Randex -
If you do not have a power valve on the secondary side, run the secondary jetting 8 sizes larger than the primary side and start off with the primary side at the stock size for the carb list number. Do your tuning from there, keeping the 8-size spread when re-jetting.
Lars
If you do not have a power valve on the secondary side, run the secondary jetting 8 sizes larger than the primary side and start off with the primary side at the stock size for the carb list number. Do your tuning from there, keeping the 8-size spread when re-jetting.
Lars
Race Director
Joined: Oct 2000
Posts: 15,044
Likes: 79
From: central FL, near the beach.
Originally Posted by lars
Randex -
If you do not have a power valve on the secondary side, run the secondary jetting 8 sizes larger than the primary side and start off with the primary side at the stock size for the carb list number. Do your tuning from there, keeping the 8-size spread when re-jetting.
Lars
If you do not have a power valve on the secondary side, run the secondary jetting 8 sizes larger than the primary side and start off with the primary side at the stock size for the carb list number. Do your tuning from there, keeping the 8-size spread when re-jetting.
Lars
that would be a #68
do u want fries with those pistons 
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
Just checked the specs: A 6210-3 is not a metering plate carb - it uses a secondary metering block with #83 jets on the sec side. Just realized you're talking spread bore carb, so these can't be jetted with the 8-size spread typical of the square carbs.
Lars
Lars
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