[footnfan]

I have used them....several years ago before they sold out. I sent them 4 old 48's. They also had me fill out the two page fact sheet on the car and engine..and in addition, suggested a new cam...and cam grinder to take full advantage of the 48's, on a 289 hipo.

The engine post install fired right up....adjusting them was easy...and I only readjusted them one time after the engine was fully broken in. Was the premium worth it for me.....YES.