Hi all.
just a quicky,
when my 318 was standard it was running NGK BP5ES spark plugs with the standard gap of I think was .8???

although my engine was an ELB model with electronic ignition it was rather blasé! Now though it’s all been changed and running a full 12 volt HEI ignition should I make the plug gaps bigger to compensate for the ‘bigger’ spark?
thoughts appreciated

 

You could open the gap to 040 but i would not go more, the big gap used in the 70s was for emissions.

 

.030 on a Champion is all I've ever run.