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Post Info TOPIC: What spark plugs do I use?
69SSConv


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What spark plugs do I use?
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For my recent acquisition of the Vortec heads from Brian and the rebuild I am doing for the Camaro engine.  This is a 350 bored .030, Lunati Voodoo Cam, Camshaft, Hydraulic Flat Tappet, Advertised Duration 256/262, Lift .454/.468.  What spark plugs do I use?

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Loren B. - Princeton, MN

1969 Chevelle SS Convertible, Bright Torch Red, 396, 200-4R, 12 bolt 3.73 Posi

1969 Chevrolet C20, Orange/White, 350, 4-spd, 4.11

1980 Camaro, RS, Impulse Blue, 350, 200-4R, 3.73 Posi

1967 Chevelle Malibu 2-DR Hardtop.  In process
John D


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I was in a similar dilemma when I built the 383... I went with the year of mfg. on the heads, and started one heat range cooler than stock. Once you get some "time" on the engine (after a thousand or so miles) you can play with heat ranges up/down.

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John D. - St. Louis Park, MN.

1965 El Camino - LT-1, 4L60e, 4wh discs, SC&C susp.
2013 F-150 Platinum - Twin Turbo 3.5

2018 Factory Five MkIV Roadster build thread
bowtie


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As a reference, the Vortec headed 330hp engines use a R44TS Delco plug. The Ramjet 350 uses MR43LTS plugs. You'll have to go to AC Delco's site to diagnose the specs on those.

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Bryan-NW 'burbs
1972 Malibu
Vaguely stock appearing, and the opposite of restored.
1999 std bore 5.7, Vortec heads, Holley Stealth Ram, GM cam
700R4, Viking coilovers, 12 bolt 4.10 posi, and a whole bunch more
69SSConv


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Allow that line, what brand plugs do you use? Delco, NGK, Champion, etc.

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Loren B. - Princeton, MN

1969 Chevelle SS Convertible, Bright Torch Red, 396, 200-4R, 12 bolt 3.73 Posi

1969 Chevrolet C20, Orange/White, 350, 4-spd, 4.11

1980 Camaro, RS, Impulse Blue, 350, 200-4R, 3.73 Posi

1967 Chevelle Malibu 2-DR Hardtop.  In process
OscarZ


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I use the Accel shorty plugs that work well with my headers. I'm not advanced enough of a tuner to comment on their performance since I've never experimented with different heat ranges etc. They are nice as far as clearance and I think the cars I've used them on ran well.

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Michael S. - Cambridge
'71 Malibu
Tony Hoffer


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Been using Autolite for years with good success...

Stopped using Champions around 1980..

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You can sleep in your car, But you cant drive your house
Enganeer


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You could start with Autolite 26.

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John E - Rogers, MN

Instructions? All I need is the exploded view.
70 El Camino soon to be ls1/t56
64 Malibu SS
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