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73-87 Chevy _ GMC Trucks
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spark plug
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Topic: spark plug (Read 7656 times)
mikewb
Registered Users
Posts: 167
spark plug
«
on:
August 05, 2008, 09:55:29 pm »
what decides the gap for the engine? if i have vortec heads on a carbureted engine. do i gap them at 60 or 45?
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VileZambonie
Global Moderator
Senior Member
Posts: 19186
Re: spark plug
«
Reply #1 on:
August 05, 2008, 09:59:54 pm »
.060" is the gap. The plug the ignition system and the combustion chamber help determine appropriate gap.
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74 GMC
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75 K5
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84 GMC
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85 K20
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86 k20
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79 K10
SUX2BU99
Senior Member
Posts: 1478
Re: spark plug
«
Reply #2 on:
August 06, 2008, 01:32:30 pm »
.060 eh? Hmmm I'll have to check mine to see what my mechanic gapped them too. I remember my Dakota R/T was something like .035.
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85 Chevy Silverado C10 short, wide, yellow, 2wd. Lowered, 60-over 350 with Dart Iron Eagle heads and Comp Cams XE268 cam, TH350 w/ shift kit, 3.40 Gov-lok 12 bolt.
mikewb
Registered Users
Posts: 167
Re: spark plug
«
Reply #3 on:
August 06, 2008, 06:27:18 pm »
old style was .45" but the vortec motors were 60" soo which do i use with just the vortec heads on my old block with carburetor and hei.
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jefferias
Newbie
Posts: 82
Re: spark plug
«
Reply #4 on:
August 06, 2008, 06:51:36 pm »
dont quote me on this but my understanding is that the older ignition systems need closer gap because of power output from dizzy and coil and whatnot. so that being said it depends on the power your throwing thru your wires to the plug. ive been doing lots of research on this and i seem to find a general consensus that .04 - .05 "works best" on sbc. i personally have mine set at .042 and everything seems to be legit. just my 2 cents worth man!
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VileZambonie
Global Moderator
Senior Member
Posts: 19186
Re: spark plug
«
Reply #5 on:
August 06, 2008, 08:38:15 pm »
Set em at .060"
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74 GMC
,
75 K5
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84 GMC
,
85 K20
,
86 k20
,
79 K10
mikewb
Registered Users
Posts: 167
Re: spark plug
«
Reply #6 on:
August 07, 2008, 03:58:34 pm »
think soo vile?
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VileZambonie
Global Moderator
Senior Member
Posts: 19186
Re: spark plug
«
Reply #7 on:
August 07, 2008, 04:42:34 pm »
I know so. I have Vortec heads. Use AC Delco 41-932 gapped at .060"
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74 GMC
,
75 K5
,
84 GMC
,
85 K20
,
86 k20
,
79 K10
mikewb
Registered Users
Posts: 167
Re: spark plug
«
Reply #8 on:
August 07, 2008, 07:09:20 pm »
with hei distributor? i have ac delco r43TS
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VileZambonie
Global Moderator
Senior Member
Posts: 19186
Re: spark plug
«
Reply #9 on:
August 07, 2008, 10:48:11 pm »
Well you are using the wrong plugs. You need to use the plugs I listed or their equivalent. Your HEI is quite capable of running these for normal driving.
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`()_);-;()_)--o--)_)
74 GMC
,
75 K5
,
84 GMC
,
85 K20
,
86 k20
,
79 K10
mikewb
Registered Users
Posts: 167
Re: spark plug
«
Reply #10 on:
August 08, 2008, 04:59:49 pm »
whats the difference in the plug? and will it run different gapped further?
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82Shortbed
Registered Users
Posts: 141
Re: spark plug
«
Reply #11 on:
August 08, 2008, 11:51:43 pm »
R45TS Plugs are not long enough to go in the chamber properly. You need I believe a .700 reach on the plug, the R45TS plugs only have a .460 reach.
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'82 Custom Deluxe
350, 882s, stock cam...For Now
mikewb
Registered Users
Posts: 167
Re: spark plug
«
Reply #12 on:
August 09, 2008, 03:54:28 pm »
sooo one with 500. will run better? because it runs fine now.
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VileZambonie
Global Moderator
Senior Member
Posts: 19186
Re: spark plug
«
Reply #13 on:
August 09, 2008, 04:17:27 pm »
It may run fine but you are not optimizing your combustion
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⌠ŻŻŻŻŻ' [☼===☼]
`()_);-;()_)--o--)_)
74 GMC
,
75 K5
,
84 GMC
,
85 K20
,
86 k20
,
79 K10
mikewb
Registered Users
Posts: 167
Re: spark plug
«
Reply #14 on:
August 09, 2008, 04:21:34 pm »
soo then it should run better with the other ones?
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spark plug