Best replacement spark plugs for C4?

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Nov 16, 2001 | 09:31 AM

Thud

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From: Bagpipes put the "fun" in "funeral"

Best replacement spark plugs for C4?

I have a feeling that the previous owner had some cheapie ones put in 25,000 miles ago and that's the cause of some recent intermittent starting problems (see other thread).
So what plugs are good for performance and longevity in an LT1?

[Modified by Thud, 8:32 AM 11/16/2001]

Nov 16, 2001 | 11:07 AM

Nathan Plemons

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Re: Best replacement spark plugs for C4? (Thud)

There are about a million other threads on this topic, but I would suggest the NGK TR55's.

Nov 16, 2001 | 12:15 PM

Thud

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From: Bagpipes put the "fun" in "funeral"

Re: Best replacement spark plugs for C4? (Nathan Plemons)

Quote:

There are about a million other threads on this topic, but I would suggest the NGK TR55's.

That's what I get for living in Off-Topic! Thanks though...

Nov 16, 2001 | 12:48 PM

Ed Ut

Burning Brakes

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From: Cedar Park Texas

Re: Best replacement spark plugs for C4? (Thud)

No debate needed = NGK TR55's

Nov 16, 2001 | 04:22 PM

AquaMetallic94LT1

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From: Hillsboro OR

Re: Best replacement spark plugs for C4? (Thud)

Champion Gold PN 2018 (double check it) work well. They last about 20K miles. Lingnenfelter used to recommend them for LT1s.

Nov 16, 2001 | 04:28 PM

Rick93Z07

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From: PA

Re: Best replacement spark plugs for C4? (AquaMetallic94LT1)

Many are also recommending new Gm Rapidfire for LT1's. At least they don't have GM's stupid platinum pucks that often delaminate and could wedge between your ring land and cylinder wall.