Has anybody ever used summit PN SUM-900240 carbide bits. It says they're ideal for iron, but would it be OK on aluminum or is the design different for an alum. bit?
thanks...ed

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Ed Maher - Moderator @ The TPI & Carb Boards
92 Z28 Convertible - Quasar blue / Tan top
305 TPI A4 2.73 - 14.8 @ 93.1
Stock except ported plenum and dual cats
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

Not used them, but I'd suggest the cheap Harbor Frieght carbide bit set for Aluminum, don't even try them on cast iron, or you'll have nothing but a mandrel with a nub on it

 

Ed, I've always used HSS cutters for porting aluminum, from the cylindrical bits to the cone-shaped ones, and the nice rounded cone one in between. Try those and don't run them too fast (> 10-15K RPM) or they will clog up with chips.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."