Racer Tech

Drag Racer - - Contents -

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...

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.

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