Indexing the plugs

[LS1CHEYENNE]

I don't want to assume which way to point to plugs when indexing so I'll let you guys tell me . I 've already got the Moroso indexing washers. This is for a 98 LS1 . Thanks

[Motocycleguy]

Going old school on us I still index my plugs though some question the gains if any. Are there gains to be had, I dont know I never tesed it myself but I have been doing it for 22 years back to my old karting days as a kid when I first started to learn the art of engine buiding and im not going to change now. There are other factors that come into play but this is the basic way to index a plug.

Correct


Here is an example of doing it backwards...
http://i59.photobucket.com/albums/g299/1sl...o/incorrect.jpg

Just installing a set of plugs woud be in between.

[outlaw_king]

we always make sure our plugs are between 10 and 2 that way the pistons will not slap the plug closed at high rpm (over 9k) i was raised that way like you for the last 20+ years and will do the same even in my street cars and trucks...lol

[RedHeartbeat]

I just read that they recommend you point the open end of the gap towards the exhaust valve. I guess that's at 10-11:00 position.

[Motocycleguy]

Should be favoring the exhaust valve

[misterp]

<div class='quotetop'>QUOTE(1slowsilverado &#064; Mar 28 2007, 05&#58;34 PM) [snapback]87632[/snapback]</div>

Should be favoring the exhaust valve[/b]

I&#39;ve heard this too but never a qualified reason as to why.

Mr. P.

[mongoose90584]

Why the exhaust valve?

[TXsilverado]

hrmmm....i always just snugged it down and went to the next one haha. works for me

[RedHeartbeat]

Got me. I just read it on the web on a couple of sites.

[RedHeartbeat]

has something to do with following the flow of the air. The kidney bean shaped dome of a GM head and the fact the air charge tries to follow the previously released air. The majority of the fuel charge supposedly puddles around the exhaust valve.