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Description
Flowtech Upright Headers - 11546FLTOverview: Flowtech Headers are the perfect combination of quality and value. These Small Block Chevy Upright headers available in 1 5 8" and 1 3 4" tube diameters are ideal for even big cubic inch Small Block Chevy engines. They feature a merged collector coupled with a collector spear that is welded inside the collector. These components help to improve the flow and performance of the header. Features: CNC Mandrel bent tubes provide consistent tubing
Overview:
Flowtech Headers are the perfect combination of quality and value. These Small Block Chevy Upright headers available in 1-5/8" and 1-3/4" tube diameters are ideal for even big cubic inch Small Block Chevy engines. They feature a merged collector coupled with a collector spear that is welded inside the collector. These components help to improve the flow and performance of the header.
Features:
- CNC Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increases the cylinder scavenging effect and improves engine breathing
- Heavy duty 16-gauge 409SS tubing for increased strength and durability
- 1-5/8” and 1-3/4” tubing diameters available for increased exhaust flow increasing performance and improved throttle response
- 3” collector for maximum strength and exhaust flow
- Extra thick header flange for a leak-free seal and maximum strength
- Welded-in collector merge spears to control exhaust gas re-entry into primary tubes
Application:
- 1955-1986 Chevrolet Corvette
- 1959-1986 Pontiac Parisienne
- 1959-1986 Chevrolet El Camino
- 1958-1985 Chevrolet Impala
- 1955-1981 Pontiac Laurentian
- 1955-1981 Chevrolet Bel Air
- 1966-1986 Chevrolet Caprice
- 1967-1986 Chevrolet K20 Suburban
- 1967-1986 Chevrolet Camaro
- 1964-1983 Chevrolet Malibu
- 1967-1986 Chevrolet C20 Suburban
- 1967-1986 Chevrolet C10 Suburban
- 1967-1986 Chevrolet K10 Suburban
- 1968-1986 Pontiac Firebird
- 1970-1986 Chevrolet Monte Carlo
- 1970-1986 GMC Jimmy
- 1971-1986 Pontiac Bonneville
- 1958-1972 Chevrolet Biscayne
- 1960-1974 Chevrolet C20 Pickup
- 1960-1974 Chevrolet C10 Pickup
- 1960-1974 Chevrolet C30 Pickup
- 1960-1974 Chevrolet K10 Pickup
- 1960-1974 Chevrolet K20 Pickup
- 1958-1972 Chevrolet Brookwood
- 1968-1981 Pontiac LeMans
- 1959-1972 Chevrolet Kingswood
- 1958-1970 Pontiac Strato-Chief
- 1975-1986 Chevrolet C30
- 1975-1986 Chevrolet C20
- 1970-1981 Pontiac Catalina
- 1975-1986 Chevrolet K10
- 1975-1986 Chevrolet K20
- 1975-1986 Chevrolet G10
- 1975-1986 Chevrolet G20
- 1975-1986 Chevrolet G30
- 1975-1986 Pontiac Grand Prix
- 1975-1986 Chevrolet K5 Blazer
- 1975-1986 Chevrolet C10
- 1969-1979 Chevrolet Nova
- 1964-1973 Chevrolet Chevelle
- 1977-1986 Chevrolet K30
- 1977-1986 Buick Regal
- 1978-1986 GMC Caballero
- 1978-1986 Oldsmobile Cutlass
- 1975-1983 Pontiac Grand LeMans
- 1978-1986 Oldsmobile Cutlass Supreme
- 1979-1986 GMC C3500
- 1979-1986 GMC G1500
- 1979-1986 GMC C2500 Suburban
- 1967-1974 Chevrolet G20 Van
- 1967-1974 GMC C15/C1500 Suburban
- 1967-1974 GMC C25/C2500 Suburban
- 1979-1986 GMC C1500
- 1973-1980 Pontiac Grand Am
- 1979-1986 GMC K1500
- 1979-1986 GMC K1500 Suburban
- 1979-1986 GMC K2500
- 1979-1986 GMC K2500 Suburban
- 1967-1974 GMC C25/C2500 Pickup
- 1967-1974 GMC C35/C3500 Pickup
- 1967-1974 GMC G15/G1500 Van
- 1979-1986 GMC G2500
- 1975-1982 Oldsmobile Delta 88
- 1979-1986 GMC G3500
- 1967-1974 GMC C15/C1500 Pickup
- 1967-1974 GMC K15/K1500 Suburban
- 1964-1971 Pontiac Acadian
- 1979-1986 GMC K3500
- 1967-1974 GMC K25/K2500 Pickup
- 1967-1974 GMC K25/K2500 Suburban
- 1979-1986 GMC C1500 Suburban
- 1979-1986 GMC C2500
- 1967-1974 GMC G25/G2500 Van
- 1967-1974 GMC K15/K1500 Pickup
- 1968-1974 Chevrolet G10 Van
- 1971-1977 Pontiac Ventura
- 1968-1974 GMC K35/K3500 Pickup
- 1971-1977 GMC Sprint
- 1968-1974 Chevrolet K30 Pickup
- 1978-1984 Oldsmobile Cutlass Calais
- 1955-1961 Chevrolet Nomad
- 1960-1966 GMC 3000
- 1960-1966 GMC 3500
- 1960-1966 Chevrolet Suburban
- 1969-1974 Chevrolet Blazer
- 1963-1968 Chevrolet Chevy II
- 1964-1969 Pontiac Beaumont
- 1960-1965 GMC Suburban
- 1955-1960 GMC Truck
- 1955-1960 Chevrolet Truck
- 1970-1974 Chevrolet G30 Van
- 1970-1974 GMC G35/G3500 Van
- 1975-1979 Chevrolet Monza
- 1955-1959 GMC PM150
- 1955-1959 GMC PM250
- 1955-1959 GMC S300
- 1955-1959 GMC S370
- 1955-1959 GMC 100
- 1955-1959 GMC 150
- 1955-1959 GMC 250
- 1955-1959 GMC 300
- 1955-1959 GMC 350-8
- 1955-1959 GMC 370
- 1955-1959 GMC F350
- 1955-1959 GMC F370
- 1955-1959 GMC FM340
- 1955-1959 GMC FM350
- 1955-1959 GMC M300
- 1977-1981 Buick Century
- 1978-1982 Buick LeSabre
- 1975-1978 GMC G15
- 1975-1978 GMC G25
- 1975-1978 GMC C35
- 1956-1959 GMC PM151
- 1956-1959 GMC PM251
- 1972-1975 Pontiac Grandville
- 1971-1974 Pontiac Grand Safari
- 1973-1976 Chevrolet Laguna
- 1975-1978 GMC K15 Suburban
- 1975-1978 GMC K25
- 1975-1978 GMC K25 Suburban
- 1975-1978 GMC C15
- 1980-1983 Oldsmobile Cutlass Cruiser
- 1975-1978 GMC G35
- 1955-1958 Pontiac Pathfinder
- 1955-1958 Chevrolet Sedan Delivery
- 1960-1963 GMC 2500 Series
- 1960-1963 GMC 1000 Series
- 1960-1963 GMC 1500 Series
- 1969-1972 Chevrolet Townsman
- 1975-1978 GMC C15 Suburban
- 1975-1978 GMC C25
- 1975-1978 GMC C25 Suburban
- 1975-1978 GMC K15
- 1968-1970 Pontiac Tempest
- 1957-1959 GMC PM152
- 1957-1959 GMC PM153
- 1977-1979 Pontiac Phoenix
- 1975-1977 Oldsmobile Custom Cruiser
- 1978-1980 Oldsmobile Cutlass Salon
- 1977-1979 Oldsmobile Omega
- 1959-1961 Chevrolet Parkwood
- 1955-1957 Chevrolet Two-Ten Series
- 1955-1957 Chevrolet One-Fifty Series
- 1972-1974 Chevrolet P30 Van
- 1977-1979 Oldsmobile Starfire
- 1977-1979 Buick Skylark
- 1969-1970 Chevrolet Estate
- 1978-1979 Pontiac Sunbird
- 1957-1958 Chevrolet Del Ray
- 1955-1956 GMC M340
- 1977-1978 GMC K35
- 1958 GMC PM252
- 1958 GMC PM253
- 1958 Chevrolet Yeoman
- 1959 Chevrolet 3B
- 1959 Chevrolet 3C
- 1959 Chevrolet 3D
- 1959 Chevrolet 3E
- 1959 Chevrolet 3F
- 1959 Chevrolet 3G
- 1967 Chevrolet K20 Panel
- 1955 GMC 100-22
- 1955 GMC 150-22
- 1955 GMC 250-22
- 1955 GMC 280-22
Specs:
| Application | Small Block Chevy |
|---|---|
| Brand | Flowtech |
| Collector Diameter | 3.00 inch |
| Collector Length | 12 inch |
| Emission Code | 4 |
| Engine | Chevrolet Small Block |
| Header Finish | Natural |
| Header Style | Upright |
| Installed Height | 37.0" |
| Primary Tube Dia. | 1-3/4 inch |
| Product Type | Headers |
| Tube Material | 409 Stainless Steel |
| Warning | California Proposition 65 |
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
4.5 ★★★★★
Based on 20 reviews
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Product Reviews
★★★★★ 5
Snagged a deal
Size: 7, Color: Redwood/Gum 10
I waited and waited to get these boots! I knew I was chancing it, but they went on sale, and I snagged them! I am a size 7, and they fit nicely with socks. a little loose, barefooted, but what psycho wears boots without socks? They are comfortable and really well-made.
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Reviewed in the United States on April 8, 2026
★★★★★ 4
Cute, comfortable waterproof boots (a little snug to put on)
Size: 7, Color: Velvet Tan/Gum 2
These are really cute Chelsea-style boots and feel very comfortable once they’re on. The waterproof material is great for wet weather and the sole feels sturdy with good traction. They look stylish enough to wear casually but still feel practical for rainy days.
The only downside is they can be a little difficult to put on at first because the opening is somewhat snug, but once they’re on they fit well and feel supportive. Overall they’re a great waterproof boot and I’ve enjoyed wearing them.
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Reviewed in the United States on March 17, 2026
★★★★★ 5
Surprisingly great for my wide feet and high instep!
Size: 10.5, Color: Velvet Tan/Gum 2
So thrilled I took a chance on these. Finding boots is impossible for me. I have wide feet, a super high instep, a bunion on one foot, and I wear a hard to find size (10.5). I ordered the 10.5 and 11 in these expecting I might need to size up for width (if I could even get them on). It was a struggle getting the 10.5s on the first time, and once I did they were somewhat uncomfortable on the top of my left foot. But I read that they would relax so decided to give it a go because I need waterproof boots for an upcoming trip and the 11s felt too long. After two days of light wear, they are already breaking in and I have no more discomfort. Getting them on is already easier and they are plenty wide enough and very comfortable to walk in. These are true to size. Super happy and worth a day of mild discomfort to break them in!
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Reviewed in the United States on March 7, 2026
★★★★★ 5
Comfortable, sturdy, waterproof
Size: 9.5, Color: Black/Black
Loce, love, love these boots. Have walked ten miles with no foot pain around NYC. They go with everything and and are so comfortable. As they are waterproof/resistant, they get a little warm in high temps, but perfect three-season boots.
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Reviewed in the United States on May 17, 2026
★★★★★ 5
Super cute, comfortable, practical, love that they are slip on
Size: 10.5, Color: Tobacco/Black
I have worn these 2-3 times already. The first day was a school/work day so I was on my feet 9 hours and the only issue I had was with the side of the boot rubbing against my ankle. I just make sure I wear socks high enough to cover my ankles or jeans that go into the boots now for long wear days.
Absolutely love them! They keep my feet dry in this snow( we live in Michigan). I had been looking for a pair like this for awhile now and was getting super frustrated that I couldn't find my size in any that I liked. I saw that they had these available in a 10.5 and I wear 11. I looked at the Sorel website reviews (since the amazon ones weren't super helpful on sizing) and they said that the boots ran big so I took a chance on the 10.5 fitting me. They fit perfect. I have long narrow feet but I could see where they would be tight or uncomfortable on someone with wider feet. I've been trying to find a pair for my mom now since she has boot envy.
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Reviewed in the United States on January 27, 2026