hey guys i was just looking in the haynes manual and on one page it says the trailing spark plugs go in the top holes and the leading go in the bottom then on the other page it says the leading go in the top holes and the trailing go on the bottom so i was hoping someone can confirm which way is rite?? and it says DO NOT MIX THEM UP?? why is that??

 

Trailing on the Top

It's also marked on the block, albeit hard to see at times. The plugs themselves should be different heats (stock is 7 and 9 if I remember correctly), which won't matter too much if you mix them up. But mixing the wires up could obviously lead to some ignition troubles.

 

sweet thanks alot man

 

The leading plugs are the BUR7EQ's and the trailing plugs are the BUR9EQ's. Both plugs are physically the same but the leadings are a hotter plug. You should always have a cooler plug in the trailing hole. The hotter leading plug in the trailing hole *could* increase the risk of detonating the motor (although in most stock applications I wouldn't be too worried about it, but better safe than sorry). For your N/A, the likelyhood of doing dammage is slim, but either way, it is best to use the correct plugs.

 

^ Thanks for the info man
its greatly appreciated