SteveC

Hi everyone;

Well, it is getting close to new spark plugs, and I believe the only difference in the 2 plugs is the gap. The TR5 is a .035 gap, and the TR55 is a .050.

Which plug would be the correct one for my stock 2001 Z28 (lid and cat back)?

Thanks in advance.

SteveC

6-SpeedZ

iTrader: (1)

TR55 would be closest.

WS6FirebirdTA00

iTrader: (33)

yep, tr55...pretty much everyone that is NA runs those jokers...they are great and have an awesome spark

Fulton 1

iTrader: (9)

As the others have said, TR55 gapped at .050" should do you nicely.

SteveC

Thank you all so much for the input, I am going to take it that "NA" stands for Naturally Asperated", which is the catagory I fall into.

SteveC

01Z0H6

iTrader: (63)

TR 55's @ .55gp!

Jabroni

TR-55's here, too. Please, please remember to check the gaps before you install them! I only had one in a set of eight that was right on out of the box. Don't trust the stock gapping!

bifster

whats the benifit to running tr55's over the iridium plugs? I hav ealot of detination ive noticed on warm days and im in canada so a warm day is like 35-40 degrees wich equates to 95-113 lol. I was thinking if i could find a cooler plug then the iridium (currently running) then id use them but if the tr55's arent any different then ill just stick with these and detune some i guess ...

Starz T/A 17

iTrader: (6)

From what Ive read the only benifit of iridium plugs is that they last ALOT longer, but as far as power is concerned normal TR55's will spark just as well as any iridium plug, with the benefit being ALOT cheaper

cals400ex

iTrader: (27)

NGK TR6's are one step colder.

02 1LE HAWK

iTrader: (1)

NGK TR-55 IX's here.

-Matt

Da Swami

iTrader: (6)

Iridium's actually make a slightly stronger spark. When they were updating our store for the new NGK "ULTRA IRIDIUM" or whatever their rep came in with a little display that actually showed the spark capabilities of iridium and copper and the iridium was a little brighter and a little larger.

However, I don't think that makes a difference unless you have a really high performance motor or a smaller (four or six) cylinder. IMO.

5301113

iTrader: (18)

TR-55. About $2.00 dollars. i gap my to .59 close to stock .60. installuniversity.com has a write up on it.

89Formulaws6

iTrader: (52)

tr-55's here as well i gapped mine at .060 as well

PureWS6

NGK TR55's at the stock .060. I repaced my plugs and then after a few hard passes pulled a few...perfect burn...they are the best plug I have found.

wicked383lt1

where can i find NGK TR55's? I have only found TR5's Or is there a vendor here with a good deal on plugs and wires package.

Sales2@Texas-speed

iTrader: (5)

http://www.texas-speed.com/shop/item...d=922&catid=11

We've got them as a package deal at the link above and keep them in stock ready to go! For the plugs alone, it is $17 plus shipping.

Mattsv8

iTrader: (7)

ive ran ngks in every chevy i own. my 8 sec s10, 9 sec nos 89 blazer, 01 camaro tr5 gaped at .060, and now my 01 tahoe. these are great plug for cheap. ive ran 2 seasons with about 1000whp and plugs looked new. i changed them cause damn 2 yrs.