What is good spark plug? (427, LS3 heads, Trex cam) - LS1TECH

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What is good spark plug? (427, LS3 heads, Trex cam)

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Old 12-30-2011, 06:35 PM   #1
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Default What is good spark plug? (427, LS3 heads, Trex cam)

What brand and type of spark plugs work well with stroker LSx engines? I am doing an engine swap and have a 427 based on Gen IV 6.0L block, with Texas Speed LS3 (L92) heads, Trex cam, and FAST 102 intake. I think compression is mid 10's.
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Old 12-30-2011, 09:11 PM   #2
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Unless you're buying a total piece of junk plug made in India or something.......a plug is a plug.

Don't fall for the Iridium crap or the super duper E3 crap or others....

Just get NGK TR5 or TR55...they are the identical plugs. Sometimes its hard to find the TR55, TR5 is identical. They just come gapped differently from the manufacturer.

Check the gaps anyway, regardless of which you buy.....gap them to .050 That plug and gap is good for a bone stock LS1 all the way up a 650 RWHP built engine.

If you're gonna spray it.....gap should be smaller and use a colder plug.

1998 WS6 T/A, AES 390ci fully forged iron block, LS6 intake, LS1 heads, 239/235 .600/.600 114 lsa, 1 7/8" Grot LT's, 3" w/Magnaflow, 4L60E, Strange 12 bolt, Baer brakes, Hotchkis STB, UMI PH Bar, LCA's w/relocation brackets, SFC's, LG G2 Super Springs. Hals FR, Bilsteins RR, 275/315.

427ci stroker died at 173,000 miles...what a great engine that was, built by the late, great - Dave DiLuca...RIP...
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Old 01-05-2012, 09:14 AM   #3
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NGK 6 would be a good start, TR55 for a hotter one and a 7 for a colder plug. I'm running 6's in my car and 7's for N2O. The 7's are too cold for daily driving they load up and the car won't idel.
99 Hugger Orange 1LE Camaro A4
New Combo L-92 Block and Heads 416ci
Built by The Head Shop. The heads are fully ported, L76 intake, custom FTI cam and valve train. Tuned by Flaco.Dyno results 508 hp at 5800. Best time 10.01 @ 138.
Thanks to Jerry, Shawn,Ed,Flaco,and Richard.

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Old 01-05-2012, 09:46 AM   #4
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NGK TR55 here.
The Gentleman's Cruiser - Deceased 12/6/2013
Mild 427 - 576RWHP 530RWT WCCH Stage 3 L92's (Still with a very small cam)
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Now rocking a Z51 C7 with Edelbrock Eforce blower.
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427, 60, bb, cam, gap, heads, kind, l92, ls1, ls1tech, ls3, plug, plugs, spark, stroked, ws6

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