X Rocker Arm, GM LS3 1.8 3/8 Ult Ra Pro Mag (1676-1)
036584213680
$56.95
4 interest-free payments or as low as $—/mo with Affirm. See if you qualify
In Stock
Compatibility
- Platform
- LS/LT
- Vehicle-specific fitment
- Review application details below
- Need help?
- Confirm fitment with us before ordering — (714) 202-7886
We list the engine platform a part is built for. That is not year-and-trim application data, so it does not confirm a fit on your specific vehicle.
- Est. install labor: 4.5 hrs — $563 at $125/hr. Pick Install at HRC and a 20% labor deposit ($113) is due at checkout; the balance is due at completion.
- An estimate for a stock vehicle, not a quote — we confirm it in writing when you book, before any labor is authorized. Seized hardware, prior modifications, diagnosis and machine work are quoted separately; tuning is arranged through our tuning partner. Questions: (714) 202-7886.
- Warranty & track disclaimer — read before you race it.
- Shipping & returns — rates and RMA terms.
- Installed in-house in Huntington Beach, CA — labor & service policy.
- Affirm and PayPal available at checkout.
More ways to pay at checkout
- For LS3/L99/L76 - Rectangle Port Head LS Applications
- Single Stud Mount Rocker - Includes Poly Lock - Requires 3/8" Studs & Guide Plates
- 1.8:1 Ratio
| Part Type | Engine Rocker Arm |
|---|---|
| C.A.R.B. Exempt for Racing and Off-Road Only Vehicles? | Yes, but must be a race/competition only vehicle. |
| C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967? | Yes, but must meet tailpipe emission standards for year of vehicle. |
| C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965? | Yes, but must meet tailpipe emission standards for year of vehicle. |
| C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967? | Yes, but must meet tailpipe emission standards for year of vehicle. |
| C.A.R.B. Exempt for On-Road Vehicles? | No |
| C.A.R.B. Exemption Reason | N/A |
| C.A.R.B. E.O. Number | N/A |
| California Proposition 65 | WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov |
| Engine Family | LS3 (Factory Offset) |
| Maximum Valve Spring Open Pressure | 850 |
| Rocker Arm Material | 8650 Chromemoly Steel |
| Rocker Arm Ratio | 1.8 |
| Rocker Arm Series | Ultra Pro Magnum |
| Rocker Stud Diameter | 3/8" |
| Title | Ultra Pro Magnum 1.8 Ratio Rocker Arm for GM LS3 w/ 3/8" Stud |
| Amazon ASIN | B0066SWD1E |
| Weight | 0.3 lb |
| UPC | 036584213680 |
| Country of Origin | USA |
Verified fitment · 216 applications
- Cadillac CTS V 6.2L (2009–2015)
- Cadillac CTS V Black Diamond 6.2L (2012)
- Cadillac CTS V Luxury 6.2L (2013–2014)
- Cadillac CTS V Premium Black Diamond 6.2L (2013–2014)
- Cadillac Escalade Base 6.2L (2007–2014)
- Cadillac Escalade ESV Base 6.2L (2007–2014)
- Cadillac Escalade ESV Luxury 6.2L (2011–2014)
- Cadillac Escalade ESV Platinum 6.2L (2008–2015)
- Cadillac Escalade ESV Premium 6.2L (2011–2016)
- Cadillac Escalade EXT Base 6.2L (2007–2013)
- Cadillac Escalade EXT Luxury 6.2L (2011–2013)
- Cadillac Escalade EXT Premium 6.2L (2011–2013)
- Cadillac Escalade Luxury 6.2L (2011–2014)
- Cadillac Escalade Platinum 6.2L (2008–2016)
- Cadillac Escalade Premium 6.2L (2011–2015)
- Chevrolet Avalanche LT 6.0L (2007–2009)
- Chevrolet Avalanche LTZ 6.0L (2007–2009)
- Chevrolet Camaro 1SS 6.2L (2011–2012)
- Chevrolet Camaro 2SS 6.2L (2011–2012)
- Chevrolet Camaro SS 6.2L (2010–2016)
- Chevrolet Camaro ZL1 6.2L (2012–2015)
- Chevrolet Corvette Base 6.2L (2008–2013)
- Chevrolet Corvette Grand Sport 6.2L (2010–2013)
- Chevrolet Corvette ZR1 6.2L (2009–2013)
- Chevrolet SS Base 6.2L (2014–2017)
- Chevrolet Silverado 1500 LT 6.0L (2007–2009)
- Chevrolet Silverado 1500 LT 6.2L (2010–2013)
- Chevrolet Silverado 1500 LTZ 6.0L (2007–2009)
- Chevrolet Silverado 1500 LTZ 6.2L (2009–2013)
- Chevrolet Suburban 1500 LT 6.0L (2007–2009)
- Chevrolet Suburban 1500 LTZ 6.0L (2007–2009)
- Chevrolet Tahoe LTZ 6.2L (2008–2009)
- GMC Sierra 1500 Denali 6.2L (2007–2013)
- GMC Sierra 1500 SLE 6.0L (2007–2009)
- GMC Sierra 1500 SLE 6.2L (2010–2013)
- GMC Sierra 1500 SLT 6.0L (2007–2009)
- GMC Sierra 1500 SLT 6.2L (2009–2013)
- GMC Sierra Denali 6.2L (2008–2016)
- GMC Yukon Base 6.2L (2011–2012)
- GMC Yukon Denali 6.2L (2007–2014)
- GMC Yukon XL 1500 Denali 6.2L (2007–2014)
- GMC Yukon XL 1500 SLE 6.0L (2007–2009)
- GMC Yukon XL 1500 SLT 6.0L (2007–2009)
- GMC Yukon XL 1500 SLT 6.2L (2010–2014)
- Hummer H2 Adventure 6.2L (2008–2009)
- Hummer H2 Base 6.2L (2008–2009)
- Hummer H2 Luxury 6.2L (2008–2009)
- Pontiac G8 GT 6.0L (2008–2009)
- Pontiac G8 GXP 6.2L (2009)
| Part No. | 1676-1 |
|---|---|
| Brand | COMP Cams |
| Part Type | Engine Rocker Arm |
| Weight | 0.3 lb |
| UPC | 036584213680 |
| Country of Origin | USA |
Platform-level fitment (Ford + GM, Phase 1). We publish the engine platform a part is built for — not year-and-trim application data — so nothing here confirms a fit on a specific vehicle. Confirm fitment with us before ordering: (714) 202-7886.