Camshafts and Compression

Hysteric said
Its the same. Plugs tan in America like they do in Australia. Grey is usually the plug working in exhaust gas residual, ie the chamber doesn't exhaust very well and the left over exhaust hangs around and is present at the next ignition event so leaves a grey colour.

Bruce discussed this with Mattax about his engine a long time ago. If you don't evacuate the cylinder what is left over becomes part of the next cycles AFR.

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What are you using for headers and exhaust Valman?

I have a dual 2.5 inch system. The headers are 1 5/8’’ tri-y. I got all that when it had the old engine in it - 360.

Most likely too small for the stroker. I’d like to put 1 7/8’’ headers on it. Can’t find any for our RHD Valiant’s. Even the custom fabricators don’t want to do it. The ones I’ve spoken to anyway.