My man Overkill has finally got his website up and I noticed he sells Brisk LGS plugs.
:: Overkill Motorsports ::
It says he has tested them, and I'd trust Will when it comes to spark plugs in L67 engines. From the site:
"In our own testing, we've found a reduction in KR, increases in gas mileage and smoother engine idle and off-idle acceleration. They are required to have a top-performing ignition system, so we recommend new plug wires with every install, check your coil terminals for corrosion, and if you have low system voltage you should perform our alternator rewire upgrade. These plugs, due to materials used, may require replacing more often than OEM plugs but should be similar to copper plug lifespan. We also recommend these be run at no higher than 12psi boost."