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11-30-2018, 06:33 PM
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#1 |
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Registered User
Join Date: May 2016
Location: Hudson FL
Posts: 64
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shorty spark plug
I want to replace my spark plugs,,,I have a SB 350. I running headers on the block,,,any suggestions as to what might be a good plug?
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12-01-2018, 11:51 AM
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#2 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: shorty spark plug
I had a box of shorty header plugs and they were NOT that much shorter. The only thing that worked for me was ceramic boots. One had to be custom ground to clear the header, but that's the ONLY way I was able to stop burning through boots, etc.
Otherwise, Accel makes them if you want to try them. Aka "truck" plugs for some reason, they're yellow and a few mm shorter.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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12-01-2018, 12:44 PM
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#3 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,522
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Re: shorty spark plug
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12-01-2018, 01:16 PM
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#4 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: shorty spark plug
Punchline: the shortest plug in that thread is the Accel I referred to. I didn't even know about the intermediate ones!
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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12-01-2018, 05:33 PM
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#5 |
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Registered User
 
Join Date: Dec 2012
Location: Vancouver, Washington
Posts: 1,644
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Re: shorty spark plug
Accels work great for me.
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1968 Chevrolet C/10 LWB - 327, TH350 - 4/5 Drop |
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12-01-2018, 08:05 PM
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#6 |
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Registered User
Join Date: Feb 2018
Location: gilmer tx
Posts: 75
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Re: shorty spark plug
I had the same problem when installing headers on my sb 350. Bought a set of high temp braided boots and slipped them over the plug boots. No more problems. They are rated to 1200 deg. Summit and several other manufacturers sell them. Work great.
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12-02-2018, 03:36 PM
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#7 |
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Registered User
Join Date: May 2016
Location: Hudson FL
Posts: 64
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Re: shorty spark plug
Ok,,,,got a set of accel shorts, whats the best gap for them when running headers?
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12-03-2018, 12:38 AM
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#8 |
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Registered User
Join Date: Feb 2018
Location: gilmer tx
Posts: 75
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Re: shorty spark plug
Depends on your ignition. Are you running an HEI or the original distributor? I wouldn't think plug gap would change from standard to shorty plugs. Iridium plugs come pre-gapped and should not be regapped.
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12-03-2018, 08:26 AM
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#9 |
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Registered User
Join Date: May 2016
Location: Hudson FL
Posts: 64
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Re: shorty spark plug
I'm running HEI with headers,,,stock 350 SB.
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12-03-2018, 11:47 AM
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#10 |
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Registered User
Join Date: Dec 2012
Location: Vancouver, Washington
Posts: 1,644
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Re: shorty spark plug
.045 seems to be the consensus on other gap threads for HEI
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1968 Chevrolet C/10 LWB - 327, TH350 - 4/5 Drop Last edited by OregonNed; 12-03-2018 at 11:48 AM. Reason: spelling |
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12-03-2018, 12:42 PM
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#11 |
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Registered User
Join Date: May 2016
Location: Hudson FL
Posts: 64
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Re: shorty spark plug
I checked with my mechanic,,,,he said 35 to 40 would be fine. They were set at about 36, installed them,,,,runs great.
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12-03-2018, 01:03 PM
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#12 |
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Registered User
Join Date: Feb 2018
Location: gilmer tx
Posts: 75
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Re: shorty spark plug
I run .045 with an HEI on a 72 350. Runs great. .045 is pretty much standard for the HEI converted 350 from what I hear. It would probably run with .035-.040 if that's what you want to run. Try it both ways and see how it runs and what it does to your mileage.
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12-03-2018, 01:04 PM
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#13 |
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Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,661
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Re: shorty spark plug
Stock points is 0.035, HEI is 0.045
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72 C10 lwb fleetside -stock 350/350 combo |
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12-03-2018, 02:44 PM
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#14 |
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Registered User
Join Date: Jul 2007
Location: Johnson City, TN
Posts: 97
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Re: shorty spark plug
Accel here .. works great for me..
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1972 Chevy C10 400sbc 4sp Matthew 4:19 And he saith unto them, Follow me, and I will make you fishers of men. |
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12-03-2018, 04:13 PM
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#15 |
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Registered User
Join Date: May 2016
Location: Hudson FL
Posts: 64
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Re: shorty spark plug
So far , so good, plugs set around 36/38. Four barrel kicks in great,,,smooth.
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