The Ford Barn

vilanar · 01-26-2016, 12:45 PM

Hi folks,
I did take off my Offy 400 heads from 8BA , and looking the spark plug electrodes they seem to be rather deep in the pocket. Combustion chamber shrouds them quite a bit so that spark don´t have a
straight shot....
I have used NGK 6L and Autolite plugs .
Have you modified the combustion chamber or machined the head so that
plugs goes deeper in the head ?
What is the safety margin from plug to valve ?
I tried to search but didn´t find anything for this subject.
Thanks,

Ari

01-26-2016, 12:45 PM	#1
vilanar Senior Member Join Date: Jan 2011 Posts: 163	Spark plug reach Hi folks, I did take off my Offy 400 heads from 8BA , and looking the spark plug electrodes they seem to be rather deep in the pocket. Combustion chamber shrouds them quite a bit so that spark don´t have a straight shot.... I have used NGK 6L and Autolite plugs . Have you modified the combustion chamber or machined the head so that plugs goes deeper in the head ? What is the safety margin from plug to valve ? I tried to search but didn´t find anything for this subject. Thanks, Ari

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