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#1 |
Join Date: Jan 2003
Location: Modesto, CA
Posts: 1,321
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What size plug gap are you running on your 350?
On the little spec sheet under my hood, it says I should be running an .060 gap...imho, that's HUGE! I run a .045 in my vette (and that has aftermarket HEI).
I'm currently running a set of Bosch Platinum's (just single electrode's) and I pulled one, and the gap was at like .035...so, should I open it to .060, or what? |
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#2 |
Account Suspended
Join Date: Nov 2002
Location: Winnipeg, Manitoba, Canada
Posts: 798
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Tim,
Mine's a 305, but I use .035 as well. Of course, I'm not talkin' high performance. ![]() ![]() ![]() ![]() |
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#3 |
Registered User
Join Date: Mar 2000
Location: Lake Jackson, TX.
Posts: 1,930
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Go to .045, that is a good all around gap. i have the HYPERTECH POWER COIL, and tried the .060 and could tell it was week. i even went to .050. i am now at .045. I dont think .035 is enough for an HEI, you loose to much spark energy.
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2004 Silverado Crewcab (Dark Spiral Gray) |
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#4 |
Registered User
Join Date: Nov 2002
Location: lacenter, washington
Posts: 718
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With a hei I vote for .45
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#5 |
Join Date: Jan 2003
Location: Modesto, CA
Posts: 1,321
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Well, I just gapped them at .060, and I must say it's a MUCH smoother idle...but that "miss" is still there...I think I have a spark plug wire that's bad causing the slight problem...gotta check the resistance now.
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#6 |
Wiseass secured himself a BAN
Join Date: Nov 2000
Location: MOON!!!
Posts: 2,282
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I tried the .045 gap on my plugs and it caused my truck to die and run really rough. So I put it at .035 and is purs like a kitten.
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#7 |
Registered User
Join Date: Mar 2000
Location: Lake Jackson, TX.
Posts: 1,930
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do you have HEI or points. points wont handle a .045 gap.
Tim, it may be smoother, but i bet you will feel a slight lag on acceration. i did anyways and as i said, i have a power coil.
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2004 Silverado Crewcab (Dark Spiral Gray) |
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#8 |
Robert Olson Transport
![]() Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,287
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Ive always run .045
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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#9 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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Plug gaps went from .035 to .045 when they went to HEI with the coil in the cap. Then when they went to the external coil like the TBI trucks use, in 87, they went back to .035.
With my MSD distributor and 6AL, I run .055.
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Mike 1985 Chevy C-10 |
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#10 |
Account Suspended
Join Date: Oct 2002
Location: Elkhart, IN
Posts: 6,400
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i've always run .045
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#11 |
Join Date: Jan 2003
Location: Modesto, CA
Posts: 1,321
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Why would my VECI sticker say .060 plug gap??
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#12 |
Available for Adoption
Join Date: May 2003
Location: Lubbock Tx
Posts: 177
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Is your motor stock? If not, don't bother looking at the sticker....it's meant for the stock engine running ALL the smog garbage......If your running a GM HEI distributor, that they made forever, gap it at .45....
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1983 C10 SWB ![]() ![]() |
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#13 |
Join Date: Jan 2003
Location: Modesto, CA
Posts: 1,321
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Well, .060 seems to be doing swell. Except it's pingin under little throttle, like a MOFO! Filled up with 87 octane, doh!
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#14 |
Registered User
Join Date: Jan 2003
Location: Washington State
Posts: 8,834
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If it's pingin, try adjusting the timing just a bit.............
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1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo |
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#15 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,720
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I run .55 on both my vortec headed, MSD'd motors.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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#16 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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Personally, I never heard of or seen a stock GM vehicle with .060 plug gap. .045 is the biggest gap I've heard of. To run a .060 gap, you would need a real high energy ignition system. More than GM ever put into any of their stuff.
Here's the ticket. If you are running a stock GM HEI coil in the cap distributor, gap the plugs at .045. If you still have a miss, and as long as the plugs are new, buy a set of wires. |
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