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bigd65 · 04-02-2002, 02:09 PM

well let me start from the beginning,
i had my carb (1406) adjusted great, a little rich at idle but ran great. at one time, when i first installed the cam (XE262 k kit) i had a very little bit of spark knock at mid-throttle, so i went to a heavier step up spring for the metering rods (from no.4 to no.5) that cured the problem, ran great. now i am pretty sure about what i am going to do but i would like a second opinion.

my problem now sence i put the MSD module and the MSD super conductor wires,is now i have spark knock at wide open throttle, BTW i have the HYPERTECH POWER COIL. i already retarded my timing from 10 degrees to 8 degrees. the vacuum advance is hooked to manifold vacuum, but at wide open throttle, the vacuum advance has no role in the timing. i also have the heaviest spring for the advance weights in the distributor. what i am planning on doing is to go another stage richer on the jets for the secondaries. stock calibration for this carb is pri-.98/sec-.95 and no.4 step up spring. as i have already said i already went to the no.5 step up spring and have already went to .98 jets in the secondaries. i am thinking i need to go to the .101 jets in the secondaries to cure the wide open throttle spark knock. i am pretty sure this is what i need to do but if anyone else has anything else to add please tell me if i am missing anything.

BTW,judging by the the pull this thing has now, if i put the bigger jets in it and it corrects my problem this thing is going to have a neck snapping second gear that wont quit. thanx in advance for any help/opinions yall can give

------------------
85 C10 LWB 350/700R4
COMPCAMS XE262 "K" kit
compcams magnum roller rockers (SOON I HOPE)
91 BURB FRONT GRILL
HOLLEY STREET DOMINATOR INTAKE
EDELBROCK 1406 PERFORMER SERIES CARB
HYPERTECH POWER COIL
FACTORY HEADERS (1 TON)
MAGNAFLOW CAT/MUFFLER/ 3in. EXHUAST
3.42 REAR GEARS
PROTHANE SUSPENSION-TOTAL KIT
DUAL 13"in ELECTRIC FANS
SERPENTINE CONVERTION FROM AN 88'YEAR MODEL
"THATS MY TOY"
Jeff Dodson
Angleton, Tx.

bigd65 · 04-06-2002, 02:19 PM

ANYONE !!!!!!!!!!!!!!!!!!!!!!!

04-02-2002, 02:09 PM	#1
bigd65 Registered User Join Date: Mar 2000 Location: Lake Jackson, TX. Posts: 1,930	tell me what yall think well let me start from the beginning, i had my carb (1406) adjusted great, a little rich at idle but ran great. at one time, when i first installed the cam (XE262 k kit) i had a very little bit of spark knock at mid-throttle, so i went to a heavier step up spring for the metering rods (from no.4 to no.5) that cured the problem, ran great. now i am pretty sure about what i am going to do but i would like a second opinion. my problem now sence i put the MSD module and the MSD super conductor wires,is now i have spark knock at wide open throttle, BTW i have the HYPERTECH POWER COIL. i already retarded my timing from 10 degrees to 8 degrees. the vacuum advance is hooked to manifold vacuum, but at wide open throttle, the vacuum advance has no role in the timing. i also have the heaviest spring for the advance weights in the distributor. what i am planning on doing is to go another stage richer on the jets for the secondaries. stock calibration for this carb is pri-.98/sec-.95 and no.4 step up spring. as i have already said i already went to the no.5 step up spring and have already went to .98 jets in the secondaries. i am thinking i need to go to the .101 jets in the secondaries to cure the wide open throttle spark knock. i am pretty sure this is what i need to do but if anyone else has anything else to add please tell me if i am missing anything. BTW,judging by the the pull this thing has now, if i put the bigger jets in it and it corrects my problem this thing is going to have a neck snapping second gear that wont quit. thanx in advance for any help/opinions yall can give ------------------ 85 C10 LWB 350/700R4 COMPCAMS XE262 "K" kit compcams magnum roller rockers (SOON I HOPE) 91 BURB FRONT GRILL HOLLEY STREET DOMINATOR INTAKE EDELBROCK 1406 PERFORMER SERIES CARB HYPERTECH POWER COIL FACTORY HEADERS (1 TON) MAGNAFLOW CAT/MUFFLER/ 3in. EXHUAST 3.42 REAR GEARS PROTHANE SUSPENSION-TOTAL KIT DUAL 13"in ELECTRIC FANS SERPENTINE CONVERTION FROM AN 88'YEAR MODEL "THATS MY TOY" Jeff Dodson Angleton, Tx. __________________ 2004 Silverado Crewcab (Dark Spiral Gray)

04-06-2002, 02:19 PM	#2
bigd65 Registered User Join Date: Mar 2000 Location: Lake Jackson, TX. Posts: 1,930	ANYONE !!!!!!!!!!!!!!!!!!!!!!! __________________ 2004 Silverado Crewcab (Dark Spiral Gray)



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