HAYS STREET 450 AND STREET 650 CLUTCH KITS ARE A GREAT SOLUTION FOR THOSE WHO WANT SOMETHING BETTER THAN THE ORDINARY STOCK CLUTCH THEIR CARS CAME WITH, BUT WHOSE CARS DON’T MAKE ENOUGH POWER TO REQUIRE AN ALL-OUT RACE CLUTCH. Street 450 clutches are designed specifically for cars that produce up to 450 hp, as their name implies, and Street 650s are for vehicles that make up to 650.
“The Street 450 clutch is perfect for someone who has a stock or mildly modified engine and a stock clutch that isn’t getting the job done anymore,” said Hays Product Manager Brandon Smith, son of ’70s Stock Eliminator terror Jimmy Smith and a parttime drag racer himself. “They want a clutch that holds better than what the car came with, but don’t want a stiff pedal or chatter.”
Street 450s are more than adequate for powerful hot rods and street machines, delivering 30% more clamping force than stock clutches while still providing smooth, chatter-free operation for prowling streets and highways. It’s a great solution if maximum drivability is a high priority, yet they’re still tough enough to stand up to occasional forays into quarter-mile competition with no ill effects.
The Street 650 is a true street/strip piece, easily able to withstand the raw power and brutal torque of highly modified naturally aspirated engines making up to 650 hp. It gives you the same 30% increase in clamping force as the 450, but the disc is a significant upgrade over factory discs. The 650 uses a puckstyle design with sintered-iron metallic construction similar to what you’d find on an all-out race clutch. These single-disc units withstand repeated dragstrip abuse and help with the shock load common to high-performance applications.
“You can slip the Street 650 a little bit and it’ll hold up just fine,” Smith said. “It’s for someone making 500, 600, even as much as 650 hp with a naturally aspirated engine. If you’re running a blower or a turbo or nitrous, it’s definitely going to hold up to 600 horsepower and probably 650. We say 600 just to be safe. The 650 has a much more aggressive clutch disc that’s perfect for drag racing. It’ll have just a tiny bit of chatter when you’re driving on the street, but it’ll hold all that power at the track, no problem.”
All Street 450 and 650 clutch kits come complete with a pressure plate, disc, throw-out bearing and alignment tool, and they all have detailed, easy-to-follow installation instructions. More than 75 different manufacturer/flywheel/ pressure-plate variations are available across both the Street 450 and Street 650 lines. Various types of pressure plate designs are available—diaphragm, Long style and Borg & Beck—and all the major domestic makes are covered: GM, Ford, Chrysler, Jeep and AMC, with many, many more to be released in the near future.
“The 450s have been out for a few months longer than the 650s, since last July, but both of them are gaining in popularity all the time,” Smith said. “These clutches are really breathing new life into the Hays brand. Folks with small-block Fords and small-block Chevys just love them. For the money, you really can’t beat them.”
Hays Street 450 clutches, like this one for 1993-97 Camaros, are ideal for vehicles making up to 450 hp, delivering smooth, chatter-free operation for street use and 30% more clamping force on track days.
All 75 different manufacturer/ flywheel/pressure-plate variations of Street 450 and 650 clutch kits come complete with a pressure plate, disc, throw-out bearing and alignment tool. The 650s come with puck-style sintered-iron metallic discs like those in an allout race clutch.
Street 650s like this one for 1965-72 Fords stand up to the power and torque of naturally aspirated engines that make up to 650 hp and blown, turbocharged and nitrous engines up to 600 horses.