SKU: 1241714422

GM8-HDSS - HD/Perf Street Sprung

$231.30 $257.00
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  • USA
  • CAN

Ships within 48 hours · Estimated delivery Aug 4 - Aug 9

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For Your Every Summer RSVP, with Code: SUMMER15

Description

GM8-HDSS - HD/Perf Street SprungSpecifications: Item Description: HD Perf Street Sprung Product Weight (lbs.): 21. 6 Torque Capacity (ft lbs.): 629 Torque Capacity Over OE: 32% Disc Material: Organic Clutch Disc Diameter (Inches): 10. 5 Clutch Disc Diameter (Millimeters): 266 Input Shaft Diameter (inches): 1. 125 Pressure Plate Type: Heavy Duty Warranty: 12 Months Description: The GM8 HDSS kit features ACT's most popular Heavy Duty pressure plate and most popular street disc. ACT

Specifications:

  • Item Description: HD/Perf Street Sprung
  • Product Weight (lbs.): 21.6
  • Torque Capacity (ft/lbs.): 629
  • Torque Capacity Over OE: 32%
  • Disc Material: Organic
  • Clutch Disc Diameter (Inches): 10.5
  • Clutch Disc Diameter (Millimeters): 266
  • Input Shaft Diameter (inches): 1.125
  • Pressure Plate Type: Heavy Duty
  • Warranty: 12 Months

Description:

The GM8-HDSS kit features ACT's most popular Heavy Duty pressure plate and most popular street disc. ACT Heavy Duty pressure plates use an exclusive diaphragm design to increase clamp load, reduce deflection, and maximize clutch life. All diaphragms endure a four-stage heat-treating process for unparalleled performance. Precision cover stampings ensure rigidity and consistency. ACT's Performance Street discs feature premium organic materials with high copper content for better heat transfer and steel-backed lining for greater burst strength and durability. These discs have reduced marcel for faster shift action to complement ACT pressure plates, with increased strength and reliability.

Description:

  • Feel: Light to moderate pedal effort, smooth positive engagement, OE to mild gear rattle
  • Life: Longer friction life, extended by ACT's exclusive diaphragm design
  • Quality: Carefully engineered, precisely assembled, accurately balanced, with premium organic friction materials for heat tolerance and reduced fade
  • Recommended Use: Recommended for street and race use
  • ACT Difference: 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability

Vehicle Fitment:

  • Application: Engine
  • Fitment covers various models of Pontiac Firebird from 1971 to 1974, including Base, Esprit, Formula, and Trans Am, with engine specifications ranging from 5.7 V8 GAS FI 5733cc to 6.6 V8 GAS FI 6555cc, all naturally aspirated and OHV.

PROP 65 WARNING:

This product can expose you to chemicals including carbon black, glass wool fibers, and silica (in clutch discs), chromium, and nickel, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 1241714422

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4.8 ★★★★★
Based on 16 reviews
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Product Reviews
J
Verified Purchase
james
Battle Creek, US
★★★★★ 5
Would recommend
Size: 10 sqft
I used this sound deadening material in my car during an audio and interior upgrade, and the difference was noticeable immediately. Road noise, vibrations, and rattling were reduced a lot, especially on the doors and floor panels. The car feels much quieter and more solid while driving now. The material was easy to cut and apply, and the adhesive stuck very well without peeling up. It has a quality feel to it and conforms nicely around curves and tight areas. I also noticed my speakers sound cleaner and have better bass response after installing it. For the price, this sound deadening material is a great value and definitely worth it if you want a quieter ride and better overall sound quality in your vehicle.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2026
D
Verified Purchase
David
Los Angeles, US
★★★★★ 5
Worth it!
Size: 50 sqft
I was worried it wouldn't work as well since it's 50 mil and I thought I got the wrong thing. Nope! Works great. Did all four doors on my 93 civic and I have enough for the floor I think. Solid price. Noise reduced by about 5 decibels hive difference. Very sticky and easy to apply I'm so happy I was able to cover most all of my car. If I need more, definitely buying this since I got so much extra and I thought I would. PS: that five decibel thing is only with the four doors. My firewall is next and then my floor, but it's such a huge difference
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 2, 2026
T
Verified Purchase
Teresa A. Patterson
Grantham, US
★★★★★ 5
Quiet your vehicle noises
Size: 50 sqft
Put this in our high roof van and couldn’t believe how much quieter it was at once. Really cut down on the vibration noise Nice and easy to install just peel n stick. Was also easy to cut with scissors for smaller areas. Seemed to be really nice quality. Didn’t notice any odor.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 9, 2026
S
Verified Purchase
Stephanie
Birmingham, US
★★★★★ 5
Sound deadening the Hot Rod
Size: 20 sqft, Size: 20 sqft
Works well, good value for the money. It’s very sticky and conforms to what you are applying it to. One 20 sq ft box did approximately the passenger side
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
M
Verified Purchase
M. Del
Lake Worth, US
★★★★★ 5
Good stuff
Size: 50 sqft, Size: 50 sqft
Good stuff. I did a lot of work on my 91 Toyota Land Cruiser 3FE. I did the inside and outside doors, as well as the under-hood area, with some extra work. I like this stuff. It sticks down good but you have to clean your surface so there's a good grip. I think these are going to do well for noise cancellation. The deadening material does well with absorbing vibrations too. But the install roller tools it will come in handy. Trust me trying to do it by hand is not worth it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2026

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