600 holley jet size starters? - Chevelle Tech
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post #1 of 34 (permalink) Old Mar 18th, 08, 9:35 PM Thread Starter
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600 holley jet size starters?

I have a 355 with 600 Holley, headers, 5 speed, 226 duration cam.
1)What size main jets should I start out with?
2) Also any help figuring out how to tell whats the best jet for this set up (ball park) would be appreciated.
p.s. I should have a air fuel ratio gage comming soon that I purchased from graigs list.

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post #2 of 34 (permalink) Old Mar 18th, 08, 10:30 PM
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Smile Re: 600 holley jet size starters?

With that cam in a perf 355 with headers 70-71 prim jets for 1st try which should be fairly close to where it needs to be,should only need a slight tweak from there at most.

BTW,since your obviously dialing in the tune of the motor what base & total tiuming are you currently running?

With that cam you need approx 18 deg base & 18 deg mech in dist all in by 2800-3k rpm.

Then 18 base + 18 mech in dist = 36 total.

You also need a vac adv for street use.

Scott

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post #3 of 34 (permalink) Old Mar 18th, 08, 10:39 PM
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Re: 600 holley jet size starters?

Stock jets for a Holley 600 Vacuum secondaries is 65. I would go no bigger than 68's.

Dave
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post #4 of 34 (permalink) Old Mar 20th, 08, 12:19 AM Thread Starter
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Re: 600 holley jet size starters?

My notes from when I last had the carb apart say main jets are stamped 601.
Does anyone know how this would relate to 65 or 68 jets?


Quote:
Originally Posted by Dave427 View Post
Stock jets for a Holley 600 Vacuum secondaries is 65. I would go no bigger than 68's.

Dave

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post #5 of 34 (permalink) Old Mar 20th, 08, 1:11 AM
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Re: 600 holley jet size starters?

Correction stock jets are 66. Going to 68 is a good start.

Dave
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post #6 of 34 (permalink) Old Mar 20th, 08, 3:53 AM
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Re: 600 holley jet size starters?

I've got an idea: Why don't you install the right jets which would be 64, then if the meter says you need changes start from there.

If it really had 601 it's probably not a 600. I would expect your carb to have 642s if it's fairly recent.

if the jet numbers have 3 digits with the last number being an upside-down 2 then you have close tolerance jets. These are pretty common in recent Holleys or emissions type Holleys.

Can you post the LIST number from the front of the choke horn?

Tom
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post #7 of 34 (permalink) Old Mar 20th, 08, 9:41 AM Thread Starter
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Re: 600 holley jet size starters?

The list number is 1850-3
I think this carb has jets from other than original for sure. the reason they say 601 on them.

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post #8 of 34 (permalink) Old Mar 20th, 08, 10:46 AM
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Smile Re: 600 holley jet size starters?

68-70 is a good starting spot but remember this is not a stock 350,its running a perf cam,perf intake,headers which can usually use a little more fuel calibration in the setup .

Thats why i suggested 70 for a start but 68 is ok,maybe slightly lean but ok,can always go up a tick if needed.

Scott

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post #9 of 34 (permalink) Old Mar 20th, 08, 10:50 AM
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Smile Re: 600 holley jet size starters?

66DREAM,did you choose that site name becasue you have or had a 66 HONDA DREAM,my father had a black 66 305 Honda Dream in 1969-70 time frame.

68-70 is a good starting spot but remember this is not a stock 350,its running a perf cam,perf intake,headers which can usually use a little more fuel calibration in the setup .

Thats why i suggested 70 for a start because 68 is for a basically stock motor but is ok for a start,maybe slightly lean but ok,can always go up a tick if needed.

Scott

SCOTT
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post #10 of 34 (permalink) Old Mar 20th, 08, 3:29 PM Thread Starter
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Re: 600 holley jet size starters?

My site name is because my kids have been telling me for 14 years that my car will never be done.

Just pulled my jets they are not 601 they look like 602 with the 2 (last digit) upside down and small looking around .055 inch diameter.
You guys are saying start out with 65-68. The problem I'm having is rich smell when driving and black shoot on rear bumper above tail pipes. (Will the larger jets ie: 65-68 help with the richness or make it worse?)
I purchased a air/fuel ratio gage on graigs list but the guy says he never got the bank draft.
What to do..............put old jets back in or try larger diameter (65-68) jets?
thanks in adbvance!
Quote:
Originally Posted by SWHEATON View Post
66DREAM,did you choose that site name becasue you have or had a 66 HONDA DREAM,my father had a black 66 305 Honda Dream in 1969-70 time frame.

68-70 is a good starting spot but remember this is not a stock 350,its running a perf cam,perf intake,headers which can usually use a little more fuel calibration in the setup .

Thats why i suggested 70 for a start because 68 is for a basically stock motor but is ok for a start,maybe slightly lean but ok,can always go up a tick if needed.

Scott

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post #11 of 34 (permalink) Old Mar 20th, 08, 5:49 PM
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Smile Re: 600 holley jet size starters?

65,66 is too lean for a perf 350 with perf cam,perf intake,along with headers so start with 68 and then dial in (up or down)the fuel calibration better from there if required.

But dont forget to get the timing curve correct 1st,thats the correct way /sequence to go about it.

Scott

SCOTT
1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2002 MAXIMA (DAILY DRIVER/1 owner,GOT 3/2013 w-44k miles)
2009 HD ELECTRAGLIDE CLASSIC ULTRA (GOT 11/14 W-9,700 miles)

Last edited by SWHEATON; Mar 20th, 08 at 6:29 PM.
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post #12 of 34 (permalink) Old Mar 20th, 08, 5:56 PM
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Re: 600 holley jet size starters?

I'd start with a stock 66 jet and drive it.
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post #13 of 34 (permalink) Old Mar 20th, 08, 8:42 PM Thread Starter
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Re: 600 holley jet size starters?

ok, I put the 67 main jets in, dont have the air/fuel gage yet, but still stinky (gassy smell) at idle and cruise from tail pipes
I have been down the timming route and have it set as youv'e suggested from months ago.
Still this stinky Holley!
1850 600 Holley
vac secoundary with a metering plate and in rear .
My floats are adjusted with just a drible out the sight bolws when car is shacken,
4.5 power valve
about 8lbs fuel pressure
about 10 inches of vacume at idle
67 main jets
.033 IFRs' with .005 wire in
No noticable drible from boosters when idle, but very rich at idle.


Do you think I need to go smaller yet with the IFR's?

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post #14 of 34 (permalink) Old Mar 20th, 08, 9:01 PM
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Re: 600 holley jet size starters?

Quote:
Originally Posted by 66dream View Post
ok, I put the 67 main jets in, dont have the air/fuel gage yet, but still stinky (gassy smell) at idle and cruise from tail pipes
I have been down the timming route and have it set as youv'e suggested from months ago.
Still this stinky Holley!
1850 600 Holley
vac secoundary with a metering plate and in rear .
My floats are adjusted with just a drible out the sight bolws when car is shacken,
4.5 power valve
about 8lbs fuel pressure
about 10 inches of vacume at idle
67 main jets
.033 IFRs' with .005 wire in
No noticable drible from boosters when idle, but very rich at idle.

Do you think I need to go smaller yet with the IFR's?
Have you put a vacume gage on this motor to see what it is at idle and under throttle I ask be cause I noticed the 4.5PV if the pv opens to soon the car will run rich and have a gas smell. my next question witch may help to answer some tunning questions is are you running a open plane or dual plane intake also what brand. will need more info to give you a real world answer like what cam are the exact cam spects, comp ratio and the above mentioned intake info as well as vac readings. Jeff

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post #15 of 34 (permalink) Old Mar 20th, 08, 9:41 PM Thread Starter
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Re: 600 holley jet size starters?

Dual plane intake, Eldelbrock RPM,compression ratio 10:1
I will have to try the vaccum while driving later tonight or tomorrow
Here is specs on my cam :

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Last edited by 66dream; Mar 14th, 09 at 6:13 PM.
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