Spark plug gaps?

[simon]

What sort of plug gaps should I have with an MSD 6AL ignition?

[Sime]

I use a MSD 6AL and when I asked them about plug gaps they recommended .045" gap and NOT to use platinum plugs.

Simon.

[simon]

Blimey, thats a big old gap ! I 'spose being an electronic ignition it is built for bigger gaps. Big gap+Big spark=Big bang{-}

[Roscoe]

I have the MSD Digital 6 and MSD told me .45 gap.
Also AFR 185/58 heads who recommended Champion RC9YC plugs. I've had it on the road for over three years and it runs great.

Roscoe

[SimonP]

I've been researching a 6AL system for my car.

The MSD blurb says that as a good starting point, gaps should be about 10 thou' wider than stock, then tweaked for best performance as required.

Simon

[Steve H]

If you go to Halfords they sell bags of gaps for your plugs, but only in packs of severn.

Steve.

"Out Of My Depth"
Chevy 350

[simon]

I've got a whole load or old gaps, could I use them? can I open them up with a screwdriver?
Best thing is to buy two pack and share them with a mate with a V6{-}

[Philip]

Hi,
its impossible to say what gap is right for your engine, it depends on various things, compression ratio being just one. When i fitted mine i found the best thing was to slowly increase the gap till you felt no improvement then your there. A mate of mines got a very similar engine to mine and his went best at 1.6mm, where as i felt mine was best at 1.4mm.
Phil

[osgood]

Contrary Mary

Simon, did they give any reason for not using platinum tip plugs? Eric.

[Sime]

Eric,

No; they didn't actually say why. I never asked as it didn't seem to matter. The recommended gap was more important.

On a separate matter; my car won't be ready to collect until next week so I won't be able to make it on Sunday. I have spoken to Ian at GRL Motors this morning and he says my Cobra "is a different car". It is going on his Rolling Road on Sat/Mon to be tuned. It has now got a more suitable/streetable Competition Cams 268 hydraulic cam in it.

Can't wait to get it back !!!

Simon.