PLUG recommendations for 95 ZR1 - ZR-1 Net Registry Forums

doc8877a · 08-23-2009

I just picked up a 95 ZR1..with 28K on it. It has been garaged for over 2 years. I am in the process of changing ALL the fluids [including gasoline]. This car has a K&N filter and a POWER EFFECTS exhaust system. I have trying to decide what spark plugs to use. MY head "hurts" from reading all the available information over the last 8 hrs today. I will be driving the car during APRIL to OCT..nothing super hard ..just enjoying it. I was considering IRIDIUM plugs from NGK or DENSO.. but there seems to be a conflict on which part # to use ..depending on the web site. I have also considered the DUAL Platinum plug from NGK or DENSO. Again, however, there seems to be an inconsistent agreement on the correct part #.

I really have not considered AC DELCO, but would take a look at them.

Can someone give me the correct part #'s for all the DENSO and NGK plugs that will work properly in a 95 ZR1 with DUNN heads both sides. I would also like some suggestions on "gap" as this seems to also change from website to website.

All I want is the longivity of the IRIDIUM or DUAL PLATINUM plugs..as this ZR1 will be lucky to have 40K on it by 2014. Any and all suggestions will be greatly appreciated.

Thanks Doc in MI

08-23-2009

NGK #7164

flyin ryan · 08-23-2009

Quote:

Originally Posted by Jeffvette

NGK #7164

Jeff didn't elaborate much, Doc...He must have had a date

. NGK 7164 is the stock number & the 'Proper' way to order. TR55IX is the more commonly talked about 'List' number. This 'list' number is how the plug is broken down, each didget has a meaning, where the stock number is just a stock number. Same plug, just different ways to order it.

doc8877a · 08-23-2009

Ryan and Jeff.. Thanks for the reply.. Well, that is 2 for 2 for the #7164 NGK. I had been sort of leaning toward that one as I have used NGK for years in my turbocharged snow machines.

Any thoughts on the gap? I think the #7164 comes at 0.044" ... I have read 0.050" is best and then that you should stay with 0.040". Any "gapping thoughts" would be welcomed.

Thanks Doc in MI

ZZZZZR1 · 08-23-2009

Doc,

I use the NGK in my Z (1994) and I think I know of 10 others using them as well... No worries with adding them.

Changing the subject....

What color is your Z?? Interior? Mod's?

What other Z did you have and what opinions do you have from it?

Congrats on your purchase!

Cheers

David

doc8877a · 08-23-2009

David.. Thanks for the input on the NGK #7164..That is what I am going to use. My "new" ZR! is BLK/BLK...28K miles...#368 with Dunn heads and has POWER EFFECTS exhaust and K&N open filter. These "mods" were already on the car.. I plan to install a Haibeck BMCBG VER #4 chip. I have no other plans for any mods... with the possible exception of changing the POWER EFFECTS exhaust. I have only driven the car about 10 miles..we trailered it home from lower MI..because I wanted to replace all the fluids. I like the ability to change the sound of the exhaust with the KNOB on the POWER EFFECTS system, but I am not sure I will like the resonanace on a long trip down the freeway. I am considering the BORLA or the CORSA if I were to change. Any thought on either one of these?

The previous ZR1 was a 91 BLK /BLK that I purchased in 94 with 5K miles when I lived in Ohio. It was bone stock and I loved it. Sold it to buy a retirement home up here in he UPPER PENINSULA of MI. Retired in 97 and moved up here from Ohio. I have not got enough miles on the 95 to make a fair comparison, but I am sure it has a lot of areas of improvement.

Regards

Doc

flyin ryan · 08-23-2009

Doc, I gap my plugs at around .037". People generally want to read way, way too much into plug gap. You want & need gap, but no too much...in a nutshell. But I'm just a dumb engine builder so what do I know

.

billybaloneey · 08-23-2009

Does any anyone know if plug indexing is worth the effort on the LT5? I think it would be a bit of a challenge to determine where the gap is pointing with them being so recessed under the cam cover. I think the tip could be marked but it would be a lot of effort to check on the direction of the gap. A flash light would definitely be needed

From what I've read...on a traditional engine...the gap is suppose to point between the intake and exhaust valves...but slightly more toward the exhaust valve. Indexing is supposed to be good for a few HP on some engines and on others there is no noticeable effect

Where would the gap point on the LT5...the primary, the secondary, in between, more toward the primary or more toward the secondary?

scholtmj · 08-24-2009

Quote:

Originally Posted by doc8877a

The previous ZR1 was a 91 BLK /BLK that I purchased in 94 with 5K miles when I lived in Ohio. It was bone stock and I loved it. Sold it to buy a retirement home up here in he UPPER PENINSULA of MI. Retired in 97 and moved up here from Ohio. I have not got enough miles on the 95 to make a fair comparison, but I am sure it has a lot of areas of improvement.

Regards

Doc

The UP is beautiful! The farthest I've been into the UP is Tahquamenon Falls State Park. Don't you have snow into June up there?

doc8877a · 08-25-2009

Quote:

Originally Posted by scholtmj

The UP is beautiful! The farthest I've been into the UP is Tahquamenon Falls State Park. Don't you have snow into June up there?

We have had snow flurries on the 4th of July ..twice since i have been coming up here. 300+ inches last year.. Need snow tires for a ZR1....Doc

08-23-2009	#1
doc8877a Join Date: Aug 2009 Location: Wetmore, MI Posts: 5	PLUG recommendations for 95 ZR1 I just picked up a 95 ZR1..with 28K on it. It has been garaged for over 2 years. I am in the process of changing ALL the fluids [including gasoline]. This car has a K&N filter and a POWER EFFECTS exhaust system. I have trying to decide what spark plugs to use. MY head "hurts" from reading all the available information over the last 8 hrs today. I will be driving the car during APRIL to OCT..nothing super hard ..just enjoying it. I was considering IRIDIUM plugs from NGK or DENSO.. but there seems to be a conflict on which part # to use ..depending on the web site. I have also considered the DUAL Platinum plug from NGK or DENSO. Again, however, there seems to be an inconsistent agreement on the correct part #. I really have not considered AC DELCO, but would take a look at them. Can someone give me the correct part #'s for all the DENSO and NGK plugs that will work properly in a 95 ZR1 with DUNN heads both sides. I would also like some suggestions on "gap" as this seems to also change from website to website. All I want is the longivity of the IRIDIUM or DUAL PLATINUM plugs..as this ZR1 will be lucky to have 40K on it by 2014. Any and all suggestions will be greatly appreciated. Thanks Doc in MI

08-23-2009	#2
Jeffvette Guest Posts: n/a	Re: PLUG recommendations for 95 ZR1 NGK #7164

08-23-2009	#5
ZZZZZR1 Banned BANNED Join Date: Oct 2006 Location: MD Posts: 3,690	Re: PLUG recommendations for 95 ZR1 Doc, I use the NGK in my Z (1994) and I think I know of 10 others using them as well... No worries with adding them. Changing the subject.... What color is your Z?? Interior? Mod's? What other Z did you have and what opinions do you have from it? Congrats on your purchase! Cheers David

08-23-2009	#6
doc8877a Join Date: Aug 2009 Location: Wetmore, MI Posts: 5	Re: PLUG recommendations for 95 ZR1 David.. Thanks for the input on the NGK #7164..That is what I am going to use. My "new" ZR! is BLK/BLK...28K miles...#368 with Dunn heads and has POWER EFFECTS exhaust and K&N open filter. These "mods" were already on the car.. I plan to install a Haibeck BMCBG VER #4 chip. I have no other plans for any mods... with the possible exception of changing the POWER EFFECTS exhaust. I have only driven the car about 10 miles..we trailered it home from lower MI..because I wanted to replace all the fluids. I like the ability to change the sound of the exhaust with the KNOB on the POWER EFFECTS system, but I am not sure I will like the resonanace on a long trip down the freeway. I am considering the BORLA or the CORSA if I were to change. Any thought on either one of these? The previous ZR1 was a 91 BLK /BLK that I purchased in 94 with 5K miles when I lived in Ohio. It was bone stock and I loved it. Sold it to buy a retirement home up here in he UPPER PENINSULA of MI. Retired in 97 and moved up here from Ohio. I have not got enough miles on the 95 to make a fair comparison, but I am sure it has a lot of areas of improvement. Regards Doc

08-23-2009	#8
billybaloneey Join Date: May 2008 Location: Mauriceville, Texas Posts: 179	Re: PLUG recommendations for 95 ZR1 Does any anyone know if plug indexing is worth the effort on the LT5? I think it would be a bit of a challenge to determine where the gap is pointing with them being so recessed under the cam cover. I think the tip could be marked but it would be a lot of effort to check on the direction of the gap. A flash light would definitely be needed From what I've read...on a traditional engine...the gap is suppose to point between the intake and exhaust valves...but slightly more toward the exhaust valve. Indexing is supposed to be good for a few HP on some engines and on others there is no noticeable effect Where would the gap point on the LT5...the primary, the secondary, in between, more toward the primary or more toward the secondary? __________________ Clint aka billybaloneey '94 - C4 ZR-1 #445 - Black/Black '05 - C6 silver/black 6sp '85 - C4 white/graphite (almost done) automatic '78 - C3 silver/black (a work in progress) automatic

08-23-2009	#7
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,741	Re: PLUG recommendations for 95 ZR1 Doc, I gap my plugs at around .037". People generally want to read way, way too much into plug gap. You want & need gap, but no too much...in a nutshell. But I'm just a dumb engine builder so what do I know . __________________ There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y.

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