25THRSS

I've heard a lot of conflicting info about how to index spark plugs properly. Some say to index them towards the intake valve, others say the exhaust, and some even say towards the piston. What are your thoughts on this matter? I'de appreciate some tips on indexing or any good "kits" out there.

AlkyIROC

I have mine indexed so that the piston dome doesn't hit the ground terminal.

Have the gap opening either pointed straight into the cylinder or towards the intake valve. I't almost impossible to get every one of them pointed in the same direction. Mix and match the plugs in different holes and you shouldn't need an indexing washer on each one. Angled plug heads aim the spark plug towards the intake valve so you should have the gap pointing there also.

Spark plugs are cheap. But a few sets of them and keep swapping them around to get a perfect set. If you can, return the rest.

All indexing kits are good. Buy what you can afford.

Vader

In which head? and with which pistons? Combustion chamber design has a lot to do with best flame propagation, and half of the chamber is comprised by the piston top.

25THRSS

This is for my 92 RS in the sig. Basically a full bolt on L03 with nitrous. I'm just trying to get everything I can out of this combo.