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Ships within 48 hours · Estimated delivery Jul 16 - Jul 21
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For Your Every Summer RSVP, with Code: SUMMER15
Description
COMP Cams Rocker Arms CS 1.6 3/8 Ultra PUltra Pro Magnum Roller Rocker Arms not only live up to the lofty standards of the original Pro Magnums but they also take Stud mount Rocker performance, stability and value to a whole new level. The 8650 chromemoly material and arched, web like design deliver increased strength and rigidity while still reducing the moment of inertia and optimizing the dynamic balance. A unique black oxide exterior finish helps prevent corrosion and increases
Ultra Pro Magnumâ„¢ Roller Rocker Arms not only live up to the lofty standards of the original Pro Magnums but they also take Stud mount Rocker performance, stability and value to a whole new level. The 8650 chromemoly material and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia and optimizing the dynamic balance. A unique black oxide exterior finish helps prevent corrosion and increases durability. Featuring Oversized trunnions, precision-sorted needle bearings and hardened Roller tips for the ultimate in performance and dependability. Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.Chevy V8 265-400 c.i.d. (SBC) - 1988 and later with Self Aligning Rockers - 3/8" Stud - 1.6 RatioInvestment cast 8650 chromemoly body and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia. Unique black oxide exterior finish helps prevent corrosion and increases durability.Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.Feature Oversized trunnions, precision-sorted needle bearings and hardened Roller tips.Lifetime Warranty - So strong that we guarantee the Rocker bodies against breakage for life. For use with up to 850 lbs of open spring pressure.
CatalogUser 1
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1991-1993 | Buick | Commercial Chassis | Base |
| 1992-1993 | Buick | Roadmaster | Base |
| 1991-1993 | Buick | Roadmaster | Estate Wagon |
| 1992-1993 | Buick | Roadmaster | Limited |
| 1990-1992 | Cadillac | Brougham | Base |
| 1990-1992 | Cadillac | Brougham | d'Elegance |
| 1992-1993 | Cadillac | Commercial Chassis | Brougham |
| 1993 | Cadillac | Fleetwood | Base |
| 1993 | Cadillac | Fleetwood | Brougham |
| 1994 | Chevrolet | Blazer | Base |
| 1992-1993 | Chevrolet | Blazer | Cheyenne |
| 1988-1991 | Chevrolet | Blazer | Scottsdale |
| 1988-1994 | Chevrolet | Blazer | Silverado |
| 1994 | Chevrolet | Blazer | Silverado Sport |
| 1994-1995 | Chevrolet | C1500 | Base |
| 1988-1995 | Chevrolet | C1500 | Cheyenne |
| 1988-1992 | Chevrolet | C1500 | Scottsdale |
| 1988-1995 | Chevrolet | C1500 | Silverado |
| 1990-1995 | Chevrolet | C1500 | WT |
| 1992-1995 | Chevrolet | C1500 Suburban | Base |
| 1995 | Chevrolet | C1500 Suburban | LS |
| 1995 | Chevrolet | C1500 Suburban | LT |
| 1992-1994 | Chevrolet | C1500 Suburban | Silverado |
| 1994-1995 | Chevrolet | C2500 | Base |
| 1988-1995 | Chevrolet | C2500 | Cheyenne |
| 1988-1992 | Chevrolet | C2500 | Scottsdale |
| 1988-1995 | Chevrolet | C2500 | Silverado |
| 1994-1995 | Chevrolet | C2500 | WT |
| 1992-1995 | Chevrolet | C2500 Suburban | Base |
| 1995 | Chevrolet | C2500 Suburban | LS |
| 1995 | Chevrolet | C2500 Suburban | LT |
| 1992-1994 | Chevrolet | C2500 Suburban | Silverado |
| 1994-1995 | Chevrolet | C3500 | Base |
| 1988-1995 | Chevrolet | C3500 | Cheyenne |
| 1988-1992 | Chevrolet | C3500 | Scottsdale |
| 1988-1995 | Chevrolet | C3500 | Silverado |
| 1988 | Chevrolet | Camaro | Base |
| 1988-1990 | Chevrolet | Camaro | Iroc-Z |
| 1989-1992 | Chevrolet | Camaro | RS |
| 1992 | Chevrolet | Camaro | RS Heritage Edition |
| 1991-1992 | Chevrolet | Camaro | Z28 |
| 1992 | Chevrolet | Camaro | Z28 Heritage Edition |
| 1988-1992 | Chevrolet | Caprice | Base |
| 1988-1996 | Chevrolet | Caprice | Classic |
| 1988-1990 | Chevrolet | Caprice | Classic Brougham |
| 1993-1994 | Chevrolet | Caprice | Classic LS |
| 1988-1990 | Chevrolet | Caprice | Classic LS Brougham |
| 1991-1993 | Chevrolet | Caprice | Classic LTZ |
| 1988 | Chevrolet | Corvette | 35th Anniversary Edition |
| 1988-1991 | Chevrolet | Corvette | Base |
| 1988-1995 | Chevrolet | G10 | Beauville |
| 1988-1995 | Chevrolet | G10 | Chevy Van |
| 1988-1995 | Chevrolet | G10 | Sportvan |
| 1988-1995 | Chevrolet | G20 | Beauville |
| 1988-1995 | Chevrolet | G20 | Chevy Van |
| 1988-1995 | Chevrolet | G20 | Sportvan |
| 1988-1996 | Chevrolet | G30 | Beauville |
| 1988-1996 | Chevrolet | G30 | Chevy Van |
| 1988-1996 | Chevrolet | G30 | Hi-Cube |
| 1988-1996 | Chevrolet | G30 | Sportvan |
| 1994-1995 | Chevrolet | K1500 | Base |
| 1988-1995 | Chevrolet | K1500 | Cheyenne |
| 1988-1992 | Chevrolet | K1500 | Scottsdale |
| 1988-1995 | Chevrolet | K1500 | Silverado |
| 1991 | Chevrolet | K1500 | Sport |
| 1990-1995 | Chevrolet | K1500 | WT |
| 1992-1995 | Chevrolet | K1500 Suburban | Base |
| 1995 | Chevrolet | K1500 Suburban | LS |
| 1995 | Chevrolet | K1500 Suburban | LT |
| 1992-1994 | Chevrolet | K1500 Suburban | Silverado |
| 1994-1995 | Chevrolet | K2500 | Base |
| 1988-1995 | Chevrolet | K2500 | Cheyenne |
| 1988-1992 | Chevrolet | K2500 | Scottsdale |
| 1988-1995 | Chevrolet | K2500 | Silverado |
| 1994-1995 | Chevrolet | K2500 | WT |
| 1992-1995 | Chevrolet | K2500 Suburban | Base |
| 1995 | Chevrolet | K2500 Suburban | LS |
| 1995 | Chevrolet | K2500 Suburban | LT |
| 1992-1994 | Chevrolet | K2500 Suburban | Silverado |
| 1994-1995 | Chevrolet | K3500 | Base |
| 1988-1995 | Chevrolet | K3500 | Cheyenne |
| 1988-1992 | Chevrolet | K3500 | Scottsdale |
| 1988-1995 | Chevrolet | K3500 | Silverado |
| 1988 | Chevrolet | Monte Carlo | Base |
| 1988 | Chevrolet | Monte Carlo | LS |
| 1988 | Chevrolet | Monte Carlo | SS |
| 1988 | Chevrolet | R10 Suburban | Scottsdale |
| 1988 | Chevrolet | R10 Suburban | Silverado |
| 1989-1991 | Chevrolet | R1500 Suburban | Scottsdale |
| 1989-1991 | Chevrolet | R1500 Suburban | Silverado |
| 1988 | Chevrolet | R20 | Cheyenne |
| 1988 | Chevrolet | R20 | Custom Deluxe |
| 1988 | Chevrolet | R20 | Scottsdale |
| 1988 | Chevrolet | R20 | Silverado |
| 1988 | Chevrolet | R20 Suburban | Scottsdale |
| 1988 | Chevrolet | R20 Suburban | Silverado |
| 1989-1991 | Chevrolet | R2500 Suburban | Scottsdale |
| 1989-1991 | Chevrolet | R2500 Suburban | Silverado |
| 1988 | Chevrolet | R30 | Cheyenne |
| 1988 | Chevrolet | R30 | Custom Deluxe |
| 1988 | Chevrolet | R30 | Scottsdale |
| 1988 | Chevrolet | R30 | Silverado |
| 1989-1991 | Chevrolet | R3500 | Cheyenne |
| 1989-1990 | Chevrolet | R3500 | Scottsdale |
| 1989-1991 | Chevrolet | R3500 | Silverado |
| 1995 | Chevrolet | Tahoe | Base |
| 1995 | Chevrolet | Tahoe | LS |
| 1995 | Chevrolet | Tahoe | LT |
| 1988 | Chevrolet | V10 Suburban | Scottsdale |
| 1988 | Chevrolet | V10 Suburban | Silverado |
| 1989-1991 | Chevrolet | V1500 Suburban | Scottsdale |
| 1989-1991 | Chevrolet | V1500 Suburban | Silverado |
| 1988 | Chevrolet | V20 Suburban | Scottsdale |
| 1988 | Chevrolet | V20 Suburban | Silverado |
| 1989-1991 | Chevrolet | V2500 Suburban | Scottsdale |
| 1989-1991 | Chevrolet | V2500 Suburban | Silverado |
| 1988 | Chevrolet | V30 | Cheyenne |
| 1988 | Chevrolet | V30 | Custom Deluxe |
| 1988 | Chevrolet | V30 | Scottsdale |
| 1988 | Chevrolet | V30 | Silverado |
| 1989-1991 | Chevrolet | V3500 | Cheyenne |
| 1989-1990 | Chevrolet | V3500 | Scottsdale |
| 1989-1991 | Chevrolet | V3500 | Silverado |
| 1988-1993 | GMC | C1500 | Sierra |
| 1994-1995 | GMC | C1500 | Sierra SL |
| 1988-1995 | GMC | C1500 | Sierra SLE |
| 1994-1995 | GMC | C1500 | Sierra SLT |
| 1988-1993 | GMC | C1500 | Sierra SLX |
| 1994-1995 | GMC | C1500 | Sierra Special |
| 1992-1995 | GMC | C1500 Suburban | Base |
| 1992-1995 | GMC | C1500 Suburban | SLE |
| 1995 | GMC | C1500 Suburban | SLT |
| 1988-1993 | GMC | C2500 | Sierra |
| 1994-1995 | GMC | C2500 | Sierra SL |
| 1988-1995 | GMC | C2500 | Sierra SLE |
| 1994-1995 | GMC | C2500 | Sierra SLT |
| 1988-1993 | GMC | C2500 | Sierra SLX |
| 1992-1995 | GMC | C2500 Suburban | Base |
| 1992-1995 | GMC | C2500 Suburban | SLE |
| 1995 | GMC | C2500 Suburban | SLT |
| 1988-1993 | GMC | C3500 | Sierra |
| 1994-1995 | GMC | C3500 | Sierra SL |
| 1988-1995 | GMC | C3500 | Sierra SLE |
| 1994-1995 | GMC | C3500 | Sierra SLT |
| 1988-1993 | GMC | C3500 | Sierra SLX |
| 1988-1995 | GMC | G1500 | Rally |
| 1988-1995 | GMC | G1500 | Rally STX |
| 1988-1995 | GMC | G1500 | Vandura |
| 1988-1995 | GMC | G2500 | Rally |
| 1988-1995 | GMC | G2500 | Rally STX |
| 1988-1995 | GMC | G2500 | Vandura |
| 1988-1996 | GMC | G3500 | Magnavan |
| 1988-1996 | GMC | G3500 | Rally |
| 1988-1996 | GMC | G3500 | Rally Camper Special |
| 1988 | GMC | G3500 | Rally Custom |
| 1988-1996 | GMC | G3500 | Rally STX |
| 1988-1996 | GMC | G3500 | Vandura |
| 1988-1996 | GMC | G3500 | Vandura Special |
| 1988-1991 | GMC | Jimmy | Base |
| 1988-1990 | GMC | Jimmy | Sierra Classic |
| 1988-1993 | GMC | K1500 | Sierra |
| 1994-1995 | GMC | K1500 | Sierra SL |
| 1988-1995 | GMC | K1500 | Sierra SLE |
| 1995 | GMC | K1500 | Sierra SLS |
| 1994-1995 | GMC | K1500 | Sierra SLT |
| 1988-1993 | GMC | K1500 | Sierra SLX |
| 1994-1995 | GMC | K1500 | Sierra Special |
| 1993 | GMC | K1500 | Sierra Sport |
| 1992-1995 | GMC | K1500 Suburban | Base |
| 1992-1995 | GMC | K1500 Suburban | SLE |
| 1995 | GMC | K1500 Suburban | SLT |
| 1988-1993 | GMC | K2500 | Sierra |
| 1994-1995 | GMC | K2500 | Sierra SL |
| 1988-1995 | GMC | K2500 | Sierra SLE |
| 1994-1995 | GMC | K2500 | Sierra SLT |
| 1988-1993 | GMC | K2500 | Sierra SLX |
| 1992-1995 | GMC | K2500 Suburban | Base |
| 1992-1995 | GMC | K2500 Suburban | SLE |
| 1995 | GMC | K2500 Suburban | SLT |
| 1988-1993 | GMC | K3500 | Sierra |
| 1994-1995 | GMC | K3500 | Sierra SL |
| 1988-1995 | GMC | K3500 | Sierra SLE |
| 1994-1995 | GMC | K3500 | Sierra SLT |
| 1988-1993 | GMC | K3500 | Sierra SLX |
| 1988-1991 | GMC | R1500 Suburban | Base |
| 1988-1989 | GMC | R1500 Suburban | Sierra Classic |
| 1990 | GMC | R1500 Suburban | SLE |
| 1988-1989 | GMC | R2500 | Base |
| 1988-1989 | GMC | R2500 | High Sierra |
| 1988-1989 | GMC | R2500 | Sierra Classic |
| 1988-1991 | GMC | R2500 Suburban | Base |
| 1988-1989 | GMC | R2500 Suburban | Sierra Classic |
| 1990 | GMC | R2500 Suburban | SLE |
| 1988-1991 | GMC | R3500 | Base |
| 1988-1989 | GMC | R3500 | High Sierra |
| 1988-1989 | GMC | R3500 | Sierra Classic |
| 1990-1991 | GMC | R3500 | SLE |
| 1988-1991 | GMC | V1500 Suburban | Base |
| 1988-1989 | GMC | V1500 Suburban | Sierra Classic |
| 1990 | GMC | V1500 Suburban | SLE |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.6 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 5
So far so good
It seems to be working well, so far. The check engine light turned off and the my vehicle seems to be running well. Be sure to follow the instructions. A while back, I wasted some money on a different catalytic converter cleaner because I put the cleaner in on a full tank of gas. It's best to wait until you're at a half tank or less of gasoline before you put in your catalytic converter cleaner. Also, I drove around right after I put in the catalytic converter cleaner and before I filled up my tank again. A couple of days later, I went to the gas station and topped off my tank. Again, it seems to be running well for now.
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Reviewed in the United States on April 21, 2026
★★★★★ 4
Works ok for some stuff.
I tried this mainly to clean my cats. It sadly didn't work for that at all.
It did however work great as a basic fuel system cleaner. It smoothed out my idle and cleaned my O2 sensors they were a bit lazy before using this product now they switch fast like they are supposed too.
In terms of my recommendation I say use as a fuel system cleaner. Or if your cats aren't too clogged in my case I bought an old neglected used car that likely had that problem for years. So I don't think any pour in tank cleaner would work in my case.
However if your car just started having cat issues. This might work??
I think it's worth a try at least and isn't much more expensive than a basic fuel system cleaner so why not?
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Reviewed in the United States on May 16, 2026
★★★★★ 5
PASSED MY INSPECTION! THIS PRODUCT WORKS LIKE A MIRACLE DONT HESITATE TO BUY IT!
Inspection on my car due the end of January! My check engine light was coming on so I checked with a code reader & found it was a P0420. Read about the Catalytic Converter System possibly being in need of replacement or perhaps clogged. I am a woman, and know next to ZERO about cars, but I can read. Did investigate and found that the replacement of a Catalytic Converter system is mad expensive- also found this Moly Cleaner to add to gas tank. I'm not going to lie; I was nervous as I have a Kia Rio 2014 that has a very small gas tank and gets great gas mileage. In reading the consensus seemed to be to add to 1/4 tank of gas and drive fast for good periods of time to blow out the clog (if it was a clog). Did I mention I live in NYC and driving for long periods of time at high speeds can be a problem because of terrible traffic. Anyhow, this Saturday I poured the can into my 1/2 filled tank and hit a parkway near my home early morning. I did drive for 45 miles sometimes at 80mph then 60mph but tried to do it for a good few minutes at a time without getting pulled over. Checked my reader again, and it was not quite ready but the engine light did stay off. Next day, drove to work, stuck in traffic somewhat & never made it over 20mph & checked my reader again- all good to go for inspection. Went last night- my car PASSED and got that sticker in my window- so I am good for another year. The BEST money I have spent all year. Thank you for carrying this product! Saved me thousands! DONT HESITATE TO USE THIS. The hardest part for me was removing the cap on the can!
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Reviewed in the United States on January 13, 2026
★★★★★ 5
Great stuff
Seemed to work as well as or better than some more expensive catalytic converter cleaners. I put it in while at 1/3 tank and my Check Engine light went out almost immediately once I started driving. My Tundra has almost 230,000 miles and still runs great but was getting a little harder to start after I switched from full synthetic oil to conventional. I’ll never do that again and immediately switched back but the damage was done. Check engine light came on and I had to crank longer to get it started. Adding this Liquid Moly fixed both issues temporarily. I have to wonder if this was used regularly, say every 3 months, if it would clean the catalytic converter more permanently?
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Reviewed in the United States on December 29, 2025
★★★★★ 3
Ehh??
Didn't work for my on my 17 hyundai accent with 90k on it.
I poured the whole bottle in with a half tank of gas. And went for a 3 day italian tune up.... no dice.
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Reviewed in the United States on May 8, 2026