spark plug gap?
03-22-2012, 12:31 PM
#1
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spark plug gap? Ac delco iridium part number 41-110
Are the plugs I got, guy at Oriellys said there pregapped at .040, but everywhere online I see people gapping anywhere from 50-60?
Will these work? Cause they can't be regapped cause of tip
Are the plugs I got, guy at Oriellys said there pregapped at .040, but everywhere online I see people gapping anywhere from 50-60?
Will these work? Cause they can't be regapped cause of tip
03-22-2012, 12:36 PM
#2
.040 is not good.
.050 is the best. I've tried all gaps on my stock engine and on my 427ci. From .035 - .060.
.050 is the best. I found that the extreme ends .035 and .060 just didn't feel right, it wasn't like the engines would run bad, but it just wasn't 100% feel-wise.
I tried all gap settings....... .050 is right in the middle and gives my 427ci the best results and it made my bone stock engine happiest as well.
I use NGK TR55 or TR5. And always check each gap before install.
.
.050 is the best. I've tried all gaps on my stock engine and on my 427ci. From .035 - .060.
.050 is the best. I found that the extreme ends .035 and .060 just didn't feel right, it wasn't like the engines would run bad, but it just wasn't 100% feel-wise.
I tried all gap settings....... .050 is right in the middle and gives my 427ci the best results and it made my bone stock engine happiest as well.
I use NGK TR55 or TR5. And always check each gap before install.
.
03-22-2012, 01:26 PM
#3
On The Tree
.40 is correct if they are the Iridium plugs.
GM Service Bulletin 03D-J-171, 12-December-2003, states the following:
Quote:
Originally Posted by General Motors Corp.
A new spark plug has been released for use in the above vehicles. The new spark plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed. The new spark plug, ACDelco Part Number 41-985 (12571164), is gapped to 1.01mm (0.040 inches) when the spark plug is made. The spark plug gap is set during manufacturing and should not be changed to the gap required with the Platinum plug, or damage to the spark plug may result
GM Service Bulletin 03D-J-171, 12-December-2003, states the following:
Quote:
Originally Posted by General Motors Corp.
A new spark plug has been released for use in the above vehicles. The new spark plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed. The new spark plug, ACDelco Part Number 41-985 (12571164), is gapped to 1.01mm (0.040 inches) when the spark plug is made. The spark plug gap is set during manufacturing and should not be changed to the gap required with the Platinum plug, or damage to the spark plug may result
03-22-2012, 02:25 PM
#4
.040 is not good.
.050 is the best. I've tried all gaps on my stock engine and on my 427ci. From .035 - .060.
.050 is the best. I found that the extreme ends .035 and .060 just didn't feel right, it wasn't like the engines would run bad, but it just wasn't 100% feel-wise.
I tried all gap settings....... .050 is right in the middle and gives my 427ci the best results and it made my bone stock engine happiest as well.
I use NGK TR55 or TR5. And always check each gap before install.
.
.050 is the best. I've tried all gaps on my stock engine and on my 427ci. From .035 - .060.
.050 is the best. I found that the extreme ends .035 and .060 just didn't feel right, it wasn't like the engines would run bad, but it just wasn't 100% feel-wise.
I tried all gap settings....... .050 is right in the middle and gives my 427ci the best results and it made my bone stock engine happiest as well.
I use NGK TR55 or TR5. And always check each gap before install.
.
