I wouldn't run them unless absolutely necessary. I switched to coppers this summer after torching my block and head when the fire ring went between #2 and #3 with regular 1011-2's. The coppers are more work to install and remove because of the spray adhesive that you've got to apply. I wired the block and cut receiver grooves in the heads when I made the switch. I've had the heads off twice to reseal the gaskets when it has started blowing compression into the water jacket. They're pretty finicky IMHO.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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