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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Shorty spark plugs

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Old Feb 21, 2026 | 10:29 AM
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Default Shorty spark plugs
I have rams horn exhaust on an otherwise stock 1995 LT1 350. Can anyone recommend a shorty spark plug for this engine so I can get more clearance for spark plug boot? The commonly recommended Accel shorty plugs have a shorter reach as well as shorter length from seat to top terminal than the stock plugs. Does that make a difference?
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Old Feb 22, 2026 | 12:17 PM
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When you say, "ram's horn manifolds", do you mean C-2/C-3 Corvette style manifolds, or stock 4th generation Camaro/Firebird manifolds?
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Old Feb 22, 2026 | 12:32 PM
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I meant an aftermarket version similar to the older Corvette manifolds.
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Old Feb 22, 2026 | 12:40 PM
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In reading my original post again, perhaps I wasn't clear about my concern. I'm wondering if the shorter reach of the plugs into the combustion chamber is a problem (18 mm stock vs 12 mm shorty).
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Old Feb 22, 2026 | 03:17 PM
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I think the short plugs are short on the plug wire side. How far they stick into the head should be the same depth as stock.
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Old Feb 22, 2026 | 03:42 PM
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The only short plug I could find with reach inside the combustion chamber same as stock was an Accel plug that sells for around $35 EACH. Way out of my budget. Others with a shorter reach are more reasonable in cost. That's why I was asking if the reach makes a difference, which I assume would be the case, but I thought someone might have actual experience with it.
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Old Feb 22, 2026 | 03:59 PM
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Reach ? as in threads or projected Vs non-projected tips ? I was running BR7 non-projected tip for some planed use of a little spray, which I never did.....yet.

Last edited by Doug G; Feb 22, 2026 at 04:11 PM.
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Old Feb 22, 2026 | 04:32 PM
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The following is copied from NGK's website: "A spark plugs reach is calculated by the length of the threads. It is measured from the seat of the plug to the end of the threads; it does not include the electrodes, or an extended metal shell. When custom-selecting a spark plug, the electrode length and projection should be included in the calculation when taking into consideration the clearance in the combustion chamber."

This what I'm asking about.
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Old Feb 22, 2026 | 04:40 PM
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No you shouldn't do that. You need the same length threads as the stock plugs.
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Old Feb 22, 2026 | 05:12 PM
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I looked at Jegs and the Accel short plugs come in sets of 4 or 8 for between $38-$53 depending on what plug you need.
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Old Feb 22, 2026 | 05:46 PM
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Thanks to all for responding. I think I'll have to find another solution besides the short plugs. There's always a way. May go with ceramic boot wires.
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Old Feb 23, 2026 | 03:53 PM
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Originally Posted by Bob70
Thanks to all for responding. I think I'll have to find another solution besides the short plugs. There's always a way. May go with ceramic boot wires.
I'm using these, but there may be other/better out there ?

Design Engineering DEI 10552 DEI Protect-A-Boots | Summit Racing
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Old Feb 23, 2026 | 03:59 PM
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How close are those boots to the exhaust, Doug? Touching? I assume you're happy with them.
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Old Feb 23, 2026 | 05:37 PM
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I've used those boots and they work fine. Last I checked there were no burn marks on my wires.
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Old Feb 23, 2026 | 05:47 PM
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Originally Posted by Bob70
How close are those boots to the exhaust, Doug? Touching? I assume you're happy with them.
While I do have headers, and they're ceramic coated (DynaTech), it was only extra precaution. The boot covers do touch on a few, and look fine.
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