ACT Streetlite X Flywheels (Streetlite XACT Flywheels) | GMC C/K Pickup - K15, Sierra Grande, naturally aspirated, 305ci V8, OHV (1976-1978)

Vendor: ACT
SKU: 600470

$1 = 5 contest entries*
  • Shed critical pounds from your powertrain by changing out your factory flywheel with an ACT Streetlite XACT Flywheel
  • Speeds up engine response and enhances acceleration by creating less inertia than heavyweight stock flywheels
  • Designed, analyzed and improved using the latest CAD and FEA software
  • Rigid one-piece construction with fewer failure points for lasting durability
  • CNC-carved and dynamically balanced to ensure an even distribution of structural metal for smoother spinning and greater heat dissipation
  • Lead-in chamfers are cut into ring gears to promote smoother contact with the starter
  • Constructed to ACT’s tight fit, concentricity and parallelism tolerances
  • Fully maintainable and resurfaceable
  • Safe for the street and SFI Spec. 1.1 certified for the drag strip
  • Your ACT Streetlite Flywheel comes with a 90-day warranty
If your factory flywheel feels about as heavy as a manhole cover, swap it out for a lightweight ACT Streetlite Flywheel. Optimized for minimal weight and maximum performance, it ramps up your engine response time, electrifies your acceleration and boosts your high-speed safety.

Designed, evaluated and enhanced using CAD and Finite Element Analysis (FEA) software, ACT Streetlite XACT Flywheels feature an unparalleled degree of precision. These 1-piece flywheels are CNC-carved, dynamically balanced and heat treated. This ensures a precise fit on your camshaft, smooth spinning across the RPM spectrum and lasting durability in intense environments—all critical for consistent performance. And when they start to wear down, you can get your ACT Street Lite Flywheel resurfaced for extended life.

From the highway to the speedway, your ACT Streetlite Flywheel fits right in on the streets and at the drag strip. In fact, every ACT XACT Flywheel is SFI-certified, so they're competition ready. To top it off, they're backed by a 90-day warranty.

We will gladly accept approved returns or exchanges of products 14 days from the date of receiving your order.

If the received date cannot be proven (no tracking information), the 14 days will be based from its order date.

Please start returns using our Returns Manager.

Returned items must be in new/unused condition.

1976 GMC C K Pickup
1976 GMC C K Pickup K15 Sierra Grande naturally aspirated 305ci V8 OHV
1977 GMC C K Pickup
1977 GMC C K Pickup K15 Sierra Grande naturally aspirated 305ci V8 OHV
1978 GMC C K Pickup
1978 GMC C K Pickup K15 Sierra Grande naturally aspirated 305ci V8 OHV

When will I receive my order?

Please allow 2-4 business days for order processing and verification. Although certain items are kept in stock, some products are custom made to order and require manufacturing time.

Upgrading your shipping from standard ground shipping expedites the shipping portion of your order only. It does not expedite the time it takes to pull, package and prepare shipment (which could be several business days). After your item has been prepared for shipment, your order will be delivered based on the shipping method chosen during check out.

Orders placed that include Hoonigan branded merchandise and Carcaine Parts Supply parts may ship out at different times from different locations - please don’t hesitate to reach out to us at any time to check in on the status of your Carcaine Parts order.

If you are unable to place an order upon entering your shipping address, one or more of the item’s in your order may not be CARB / 50 State compliant. For more information should you encounter this, please contact us.

For questions regarding shipping, please do not hesitate to reach out to for more information. Carcaine support hours are Monday through Friday 7am-3:30pm Pacific.

While we try our best to provide up to date shipping information, shipping dates are subject to change at any time.

We are not responsible for any lost, stolen, or damaged shipments. The buyer assumes all responsibilities of claims made with the shipping carrier. Please check back with us periodically for any updates regarding our shipping policies. Currently, Carcaine Parts Supply is only available to ship to the contiguous 48 states and does not offer international shipping at this time.

What's your Returns & Exchanges policy?

Items are eligible for return within 30 days of delivery. If the received date can not be proven, the 30 days will be based upon the order date. Items eligible for return must be in new and unused condition.

Defective items are eligible for a full refund upon return and will not be subject to return shipping and/or restocking fees. Orders that are free of error are subject to return shipping fees and restocking fees. Refund amount on orders free of error will be the amount paid minus shipping and/or restocking fees.

Tuners and programmers are deemed “used” upon plugging them into your vehicle and may be unreturnable as a result.

Brembo Big Brake Kit and Brembo GT Kit returns will not be accepted because of lack of clearance. Please verify wheel clearance before purchasing. Brembo Big Brake Kits approved for return are subject to at least a 15% restock fee and the customer will be responsible for return freight charges. All Brembo returns must be in new condition (no bolt marks, paint chips, etc.), in the original packaging, and MUST include the anti-counterfeit card. Refunds for returned Brembo orders may be held until Brembo has inspected the returned order and deemed it acceptable.

Customers are liable for items that are deemed “unreturnable” upon receipt of return and may be subject to the order being charged back to the full amount. For questions regarding returns, please do not hesitate to reach out to for more information. Carcaine support hours are Monday through Friday 7am-3:30pm Pacific.

Returns and Exchanges are subject to change at any time.

How do I track my order

Use our Order Lookup tool, or Please feel free to contact us at - We’d be happy to provide you an update to your order.

Carcaine support hours are Monday through Friday 7am-3:30pm Pacific.

How do I cancel my order?

Please contact us and we’d be happy to assist you with cancelling your order.

Cancellation requests will be denied for orders that have shipped out already and may be subject to restocking and return shipping fees. If an order should ship out or be in transit while a cancellation has been requested please accept the package, contact us, and we will set up a return for you.

For questions regarding cancellations, please do not hesitate to reach out to for more information. Carcaine support hours are Monday through Friday 7am-3:30pm Pacific.

Cancellations are subject to change at any time.

How do I contact Carcaine Support?

Carcaine Parts Supply support hours are Monday through Friday 7am-3:30pm Pacific. We can be reached via Email at or by phone at 888-432-1847.

For information on Hoonigan branded merchandise, please shoot an email over to