Speedmaster spark plug holes improvement??

Personally....... I’m looking forward to 318will and jpars “bolt ‘em on and go” results.:thumbsup:

That’s as good of a “real world” test as there is.

Plus, it’s two rather different combos.
360, low cr, small cam, auto..... vs ......408, higher cr, TR, solid cam, stick.

The set that went on the 360 here last spring had nothing done to them that would have made any difference in power.

They aren’t going to fix a lousy combo though.

I think 318wills test will answer some questions about how they’ll match up with the combos that are on the milder end of the scale.