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Description
Fits Small Block Chevy, 2.5" Collector-Natural Finish, Exhaust Manifold 8525HKRHooker's new cast iron small block Chevy exhaust manifolds offer an increase in performance and visual appearance over stock style manifolds. Their compact design fit into a wide variety of replacement and engine swap applications. This means you get the traditional look and easy fitment of a stock style exhaust manifold but now with a smoother, cleaner appearance, plus more modern features. These manifolds are cast out of high silicon molybdenum
Hooker's new cast iron small-block Chevy exhaust manifolds offer an increase in performance and visual appearance over stock-style manifolds. Their compact design fit into a wide variety of replacement and engine swap applications. This means you get the traditional look and easy fitment of a stock style exhaust manifold but now with a smoother, cleaner appearance, plus more modern features. These manifolds are cast out of high silicon-molybdenum ductile iron for high temperature strength and better resistance to oxidation and cracking. Internally these manifolds have a larger than stock 1 5/8-inch cross-sectional area and 2 1/2-inch outlets for better air flow and improved performance. Designed for rectangular port heads, these manifolds fit many popular GM applications including standard straight and Vortec straight plug head designs. Finishes include natural, silver, black, and titanium ceramic. Gaskets and hardware are included, along with weld-on flanges to aid in downpipe installation.
Features:
- A smoother, cleaner appearance compared to original exhaust manifolds, while maintaining a factory style look and feel
- Made from high silicon-molybdenum ductile iron for high temperature strength plus resistance to oxidation and cracking
- Designed with a larger 1 5/8? cross-sectional area and 2 ½? outlets for better air flow and increased performance
- Designed for rectangular port heads
- Accommodates standard straight and Vortec straight plug head designs for better application coverage
- Includes weld-on flanges for easier downpipe pipe installation (custom downpipe required)
- Available in natural cast iron or ceramic coated finishes (silver, black and titanium)
- Includes mounting hardware and gaskets for inlet and outlet flanges
Specs:
| Bolt Size | 3/8-16 x 3/4 |
|---|---|
| Brand | Hooker |
| California Proposition 65 Chemical Name | Nickel (Metallic) |
| California Proposition 65 Required | Yes |
| CARB (California) Compliant | No |
| Collector Diameter | 2.50 inch |
| Emission Code | 3 |
| Engine | Chevrolet Small Block Gen I |
| Exhaust Port Shape | Rectangle |
| Header Finish | Natural |
| Header Style | Manifold |
| Material | Cast Iron |
| Primary Tube Diameter (in) | 1-5/8 inch |
| Product Type | Manifold |
| Sale Category | Exhaust |
Application:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1968-1974 | Chevrolet | C10 Pickup | Base |
| 1968-1974 | GMC | C15/C1500 Pickup | Base |
| 1973-1974 | Buick | Century | Base |
| 1973-1974 | Buick | Century | Luxus |
| 1961-1974 | Buick | LeSabre | Base |
| 1974 | Buick | LeSabre | Luxus |
| 1973-1974 | Buick | Regal | Base |
| 1958-1974 | Chevrolet | Bel Air | Base |
| 1970-1974 | Chevrolet | Camaro | Base |
| 1973-1974 | Chevrolet | Camaro | LT |
| 1970-1974 | Chevrolet | Camaro | Z28 |
| 1973-1974 | Chevrolet | Caprice | Classic |
| 1973-1974 | Chevrolet | Caprice | Estate |
| 1958-1974 | Chevrolet | Impala | Base |
| 1973-1974 | Chevrolet | Laguna | Base |
| 1974 | Chevrolet | Laguna | Type S-3 |
| 1964-1974 | Chevrolet | Malibu | Base |
| 1974 | Chevrolet | Malibu | Classic |
| 1973-1974 | Chevrolet | Malibu | Estate |
| 1971-1974 | Chevrolet | Monte Carlo | Base |
| 1973-1974 | Chevrolet | Monte Carlo | Landau |
| 1961-1974 | Oldsmobile | Cutlass | Base |
| 1968-1974 | Oldsmobile | Cutlass | S |
| 1971-1974 | Oldsmobile | Delta 88 | Base |
| 1971-1974 | Oldsmobile | Delta 88 | Royale |
| 1958-1974 | Pontiac | Catalina | Base |
| 1959-1974 | Pontiac | Catalina | Safari |
| 1971-1974 | Pontiac | Firebird | Base |
| 1971-1974 | Pontiac | Firebird | Esprit |
| 1971-1974 | Pontiac | Firebird | Formula |
| 1971-1974 | Pontiac | Firebird | Trans Am |
| 1973-1974 | Pontiac | Grand Am | Base |
| 1962-1974 | Pontiac | Grand Prix | Base |
| 1963-1974 | Pontiac | LeMans | Base |
| 1972-1974 | Pontiac | LeMans | Luxury |
| 1969-1974 | Pontiac | LeMans | Safari |
| 1974 | Pontiac | LeMans | Safari Luxury |
| 1970-1974 | Pontiac | LeMans | Sport |
| 1971-1973 | Buick | Centurion | Base |
| 1965-1973 | Buick | LeSabre | Custom |
| 1970-1973 | Chevrolet | Camaro | RS |
| 1965-1973 | Chevrolet | Chevelle | Deluxe |
| 1973 | Chevrolet | Laguna | Estate |
| 1973 | Chevrolet | Monte Carlo | S |
| 1964-1973 | Pontiac | GTO | Base |
| 1970-1972 | Buick | Skylark | 350 |
| 1961-1972 | Buick | Skylark | Base |
| 1968-1972 | Buick | Skylark | Custom |
| 1964-1972 | Buick | Sportwagon | Base |
| 1958-1972 | Chevrolet | Biscayne | Base |
| 1970-1972 | Chevrolet | Camaro | SS |
| 1971-1972 | Chevrolet | Caprice | Base |
| 1964-1972 | Chevrolet | Chevelle | Base |
| 1967-1972 | Chevrolet | Chevelle | Concours |
| 1969-1972 | Chevrolet | Chevelle | Concours Estate |
| 1969-1972 | Chevrolet | Chevelle | Greenbrier |
| 1968-1972 | Chevrolet | Chevelle | Malibu |
| 1968-1972 | Chevrolet | Chevelle | Nomad |
| 1964-1972 | Chevrolet | Chevelle | SS |
| 1972 | Oldsmobile | Cutlass | Cruiser |
| 1961-1972 | Oldsmobile | F85 | Base |
| 1971-1972 | Pontiac | Catalina | Brougham |
| 1971 | Oldsmobile | Delta 88 | Custom |
| 1970-1971 | Pontiac | GTO | The Judge |
| 1971 | Pontiac | LeMans | T37 |
| 1959-1970 | Chevrolet | El Camino | Base |
| 1968-1970 | Chevrolet | El Camino | Custom |
| 1968-1970 | Chevrolet | El Camino | SS |
| 1964-1970 | Oldsmobile | Vista Cruiser | Base |
| 1958-1970 | Pontiac | Bonneville | Base |
| 1959-1970 | Pontiac | Bonneville | Safari |
| 1962-1970 | Pontiac | Catalina | Ventura |
| 1967-1970 | Pontiac | Executive | Base |
| 1967-1970 | Pontiac | Executive | Safari |
| 1961-1970 | Pontiac | Tempest | Base |
| 1970 | Pontiac | Tempest | GT |
| 1961-1969 | Buick | Special | Base |
| 1966-1969 | Buick | Sportwagon | Custom |
| 1967-1969 | Chevrolet | Chevelle | 300 Deluxe |
| 1961-1969 | Pontiac | Tempest | Custom |
| 1961-1969 | Pontiac | Tempest | Safari |
| 1967-1968 | Chevrolet | Chevelle | 300 |
| 1961-1967 | Buick | Special | Deluxe |
| 1964-1967 | Chevrolet | Impala | SS |
| 1964-1967 | Oldsmobile | Cutlass | Holiday |
| 1967 | Oldsmobile | Cutlass | Turnpike Cruiser |
| 1964-1967 | Oldsmobile | Vista Cruiser | Custom |
| 1964-1967 | Pontiac | Catalina | 2+2 |
| 1962-1966 | Oldsmobile | F85 | Deluxe |
| 1966 | Oldsmobile | F85 | Holiday |
| 1958-1966 | Pontiac | Star Chief | Base |
| 1966 | Pontiac | Star Chief | Executive |
| 1962-1965 | Buick | Wildcat | Base |
| 1965 | Buick | Wildcat | Custom |
| 1965 | Buick | Wildcat | Deluxe |
| 1962-1965 | Chevrolet | Chevy II | Base |
| 1962-1965 | Chevrolet | Chevy II | Nova |
| 1964-1965 | Chevrolet | Chevy II | Nova SS |
| 1961-1965 | Oldsmobile | Starfire | Base |
| 1961-1963 | Buick | Invicta | Base |
| 1959-1962 | Pontiac | Bonneville | Custom |
| 1961-1962 | Pontiac | Tempest | LeMans |
| 1960-1961 | Pontiac | Ventura | Base |
| 1960 | Chevrolet | Biscayne | Fleetmaster |
| 1958 | Chevrolet | Del Ray | Base |
| 1958 | Pontiac | Chieftain | Base |
| 1958 | Pontiac | Chieftain | Safari |
| 1958 | Pontiac | Star Chief | Custom Safari |
| 1958 | Pontiac | Star Chief | Super Deluxe |
| 1958 | Pontiac | Super Chief | Base |
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
4.7 ★★★★★
Based on 1816 reviews
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Product Reviews
★★★★★ 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?
WAS THIS REVIEW HELPFUL?YesReportShare
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
★★★★★ 5
Works great
Follow instructions and it will work. Had a p420 code, caught it early used this. No more code and passed emissions
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Nice Filter Wrench for my Volvo V70XC!
Size: 86mm x 16
I was needing a filter wrench for my 2001 Volvo V70XC and couldn't find anything that fit from the local auto parts stores. Not knowing what to expect, I took a chance on this one since most of the reviews were 5 star and the price was exceptional.
When I received it, I was quite pleased with the construction and finish. I have a brand new oil filter housing for my Volvo (since the one currently on my car is chewed up from the former owner using slip-jaw pliers or something on it) and the fit is perfect! I have worked as a mechanic my whole life (aircraft & automotive), and spent a couple of years as a technician at an automotive dealership and I can say that the tool looks like it is designed for heavy-duty use.
The stamped steel housing is thicker than those found in local auto parts stores and the drive adapter has a thick arc welded bead along the inside of the tool. So, it appears to be made to hold up to some fairly heavy torque. Although the product description states that it is 1/2", the drive adapter is actually made for direct attachment to a 3/8" drive. Perhaps this error stems from the fact that they offer a much larger wrench (118-131mm) and this is a more accurate description of their other offerings.
The 3/8" drive adapter works perfectly and a 21mm socket fits nicely on the external hex. Fits with SAE sizes are a mixed bag, though. I was able to attach a 13/16" 12-pt. box-end wrench, but not the opposing open-end. A similarly sized 13/16" 6-pt. socket was extremely tight, so I wouldn't recommend this size and would just go with the 21mm if you had to use the external hex. Otherwise, just use the 3/8" drive adapter for easiest use of this tool. The adapter also incorporates ball detents on all four sides of the internal 3/8" drive, so your ratchet or extension won't easily fall off while in use.
Since this tool is made for oil filter removal & installation, I'm sure that it will deliver as promised. I'll post an update after my next oil change and I get a chance to use it and install the new filter housing I have.
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Reviewed in the United States on January 25, 2014
★★★★★ 5
Makes the job easy
Size: 88.5mm x 16
Worked well for removing and installing the oil filter housing.
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Reviewed in the United States on April 17, 2026