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Old 07-29-2005, 02:47 PM
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What spark plug should I run???

Hi everybody!

I have a big block chevy, I heard I have to run cold spark plug, Right now, I run AC Delco R44T, is that the right spark plug??? Or I have to buy another like NGK V groove or something else...

My head are GM Iron 353049

Any advice.

Stephane

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Old 07-29-2005, 08:52 PM
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Stephane when i was running stock cars chevy in fact i used autolite spark plugs cant beat them for performance i know sounds weird but they work. They have a good temp range too.
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Old 07-29-2005, 09:29 PM
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Try Autolite AP145's. Make sure the ignition is up to snuff. Cold plugs don't work well with weak ignitions.

Larry
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Old 07-30-2005, 10:41 PM
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weak ignition

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Originally Posted by coldknock
Try Autolite AP145's. Make sure the ignition is up to snuff. Cold plugs don't work well with weak ignitions.

Larry
Hi Larry, in fact, I really don't have a weak ignition, I have a DUI (davis unified ignition) they said I can gap spark plug to 55 thousand.

I heard I have to used NGK V groove UR5 spark plug or R44t (AC DELCO)..I never heard about autolite AP145...are they common???

Stephane
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Old 05-24-2008, 08:20 PM
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spark pluggs

The only reason to go down a heat range or up a heat range or vise versa is if you pull your pluggs out and theirs ash build up or detonation. I suggest going with a very basic autolite copper plugg. Copper is the best conducter in the world besides gold of course. So I would just throw a cheap set of autolite coppers at it. Now the downside to running a copper plugg is you'll be replaceing them more frequently(I do mine every 15,000).
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Old 05-24-2008, 09:57 PM
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Hi Stephane, I have seen so many drivability problems with NGK V groove spark plugs don't use them. AC R44t plugs are OK to use. I recommend Autolite APP145 spark plugs gapped at .045 thousands. These will give you a good burning combustion throughout all temperature ranges, and longevity is a plus.

Stephen
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Old 05-25-2008, 08:18 PM
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I don't have a heat range for you- though I was running R44 plugs fine a few years back. But it might be worth your time to check out E3 plugs. I've had a couple of guys I trust who run both street and strip recommend them to me.
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