08-14-2013 | #1 |
Join Date: Aug 2013
Location: NJ
Posts: 117
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Spark Plugs
Fellas..Ok I have a fully ported 368..I installed a set of NGK Iridium TR71X gapped at .50..The car seems to hate them as my slight misfire has gotten worse immedietely..I pulled them back out and reset gap at .35..Still no good.. I'm suspecting I have a weak coil and plan to pull the plenum.I would like to try one more set of plugs before I do so.. What would be the recommended non iridium plug to go for?I would like to go 1 step colder than stock..Again this is for a nicely modded 368 91Z running on a Marc Heibeck chip..I know I've been a pain these last few days,however Atleast I can get my post count up so I don't look like the noob that I am..
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08-14-2013 | #2 |
Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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Re: Spark Plugs
Seem Max in Malan, Italy was having the same issue with NGK Iridiums.
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Scott Vett owner since 1979._It's about the car and the people |
08-15-2013 | #3 |
Join Date: Nov 2006
Location: dayton,ohio
Posts: 425
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Re: Spark Plugs
FR1LS is one step colder if you want plugs with crush washers. They work good for me.
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[FONT=Comic Sans MS][COLOR=red]"I wanna go fast!!"[/COLOR][/FONT] [FONT=Comic Sans MS][COLOR=#ff0000]-- Ricky Bobby[/COLOR][/FONT] |
08-16-2013 | #4 |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Spark Plugs
AC Delco 41-602 copper plugs are good for at least 10k miles.
Plug aging is insidious by nature. And, because of the cost, some want to wring out every drop of use from a set of plugs. However, the 41-602s are cheap enough and since plugs are easy enough to change on the LT5, their advantage over "super-duper pricy plugs" is I can pop in a fresh set every season without causing a ripple in my beer money. I (and others) in "FBI" land use them and have no issues with them - work perfect way past 7200 rpm and 500 chp; and I get north of 26 mpg at 70 mph (cruise). FWIW, P.
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
08-16-2013 | #5 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,700
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Re: Spark Plugs
I think I suggested NGK BKR6Es @ .035". I have found these plugs to be of the right heat range for a modded motor. You could search the site. I may have pics of plug cuts I have done.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
08-16-2013 | #6 |
Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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Re: Spark Plugs
I just may have to go that way because I tend to take plugs out each year for various reasons anyway. And at $1.41 ea with $0.50 rebate per plug right now at rockauto the time is right. That's $0.91 ea !!
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Scott Vett owner since 1979._It's about the car and the people |
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