hey everyone

I've got a holley 4160 600 cfm that I am planning on putting the 4150 conversion kit on it (basically adds the metering block) What I don't know is what jets I should start out with so that I'm not running too lean. I've got a real problem of running rich over 3000 rpms (dyno tested w/ wideband) and since there aren't jets on the secondaries yet there is nothing i can do about it.

I've got a 350 w/ centerbolt heads, edelbrock performer rpm intake, holley 4160 600 cfm carb, edelbrock tes shortys, flowmaster 80 series... oh and the jets for the primaries are 60s

thanks

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Jay
black 85 Z28 - waiting on a new paint job, then she'll be real purty
blue 85 Z28- not running right now, but that should be fixed soon (I hope)
87 Chevy S10 Blazer- 2.8 liters of pure fury

Jay's Website
yahoo im: wildcat856
AIM: Jayman85Z
Homer no function beer well without
check out GMPerformance.org

 

Since the primaries have a power valve and the secondaries don't (or shouldn't), a good starting point for the secondaries is 8 jet sizes higher than the primaries.

It all depends on the carb design since there can be many differences from model to model.

From that starting point you can then adjust the jets to best suit your engine combination. The jets that work best for your engine may not be the same as someone elses similar engine.

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Stephen's racing page
or check out the race car

87 IROC SuperPro race car
461 big block
Best ET on a time slip: 11.349
Best MPH on a time slip: 119.7
Best corrected ET: 10.983

Altitude corrected rear wheel HP: 480
Best 60 foot: 1.546
Member of the Calgary Drag Racing Association

 

ditto what stephen said. you need to get out there and start w/about that 68 or 70 and go from there.

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1986 Iroc Z
355, cleaned up trick flow twisted wedge G1 heads, 750 holley, 700r4, 10:1 compr., forged flat tops, solidcam .501I .510E, 4gen rear w/3:73 posi, girdle, and disc's, Edel. torker II, shift kit, 2500 stal, hedmann LT. headers, 4 gen seats, man. strg., lt1 starter, alum. w/p, msd 6al, coil, dist., mallory wires.
12.86 @109mph so far(still need fine tuning)

1995 z28,SS Hood, Iroc style spoiler, tints and black outs, 700r4,2400 act. stall speed,B&M hammer shifter, 17" budnick trilogy III wheels, 275/40 ZR17, 160 stat, man. cooling fan sw., homemaid CAI,1LE elbow, hypertech airfoil, t.b.bypass,!cat, flowmaster, !maf screen, relocated batt., 1LE front l.c.a.s', poly trans and torq.arm bushings, MSD 6AL, custom program, p&p maf, accel coil, and under drive pulley

mods that i have, just not on car yet:
msd wires, edelbrock mid. headers, edelbrock rpm catback

 

thanks for the info guys

I plan on putting it on the rollers again in Oct (I think the 12th is our next dyno day) I just wanted somewhere to start as far as the jetting goes.... God knows that not everyone can make use of the same jet sizes, cause of course that would be too easy