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Description
Flowtech Upright Headers - 11551FLTOverview: Flowtech Headers are the perfect combination of quality and value. These Big Block Chevy Upright headers available in 2 1 4" tube diameters are ideal for even big cubic inch Big Block Chevy engines 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 2 1 4 tubing
Overview:
Flowtech Headers are the perfect combination of quality and value. These Big Block Chevy Upright headers available in 2-1/4" tube diameters are ideal for even big cubic inch Big Block Chevy engines
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
- 2-1/4” tubing diameter for increased exhaust flow increasing performance and improved throttle response
- Extended 4” collector for maximum strength and exhaust flow
- Extra thick 7/16” header flange for a leak-free seal and maximum strength
- Welded-in collector merge spears to control exhaust gas re-entry into primary tubes
- Center of exhaust port to end of collector length is 33-1/2"
Application:
- 1975-1995 Chevrolet G30
- 1968-1986 Chevrolet C20 Suburban
- 1968-1985 Chevrolet K20 Suburban
- 1979-1995 GMC C2500 Suburban
- 1979-1995 GMC C2500
- 1979-1995 GMC C3500
- 1979-1995 GMC K3500
- 1968-1980 Chevrolet C10 Suburban
- 1975-1986 Chevrolet C20
- 1975-1986 Chevrolet C30
- 1967-1976 Chevrolet Caprice
- 1967-1976 Chevrolet Impala
- 1977-1986 Chevrolet K30
- 1967-1975 Chevrolet Bel Air
- 1967-1975 Chevrolet El Camino
- 1967-1975 Chevrolet Malibu
- 1967-1974 Chevrolet Corvette
- 1988-1995 GMC G3500
- 1988-1995 Chevrolet C3500
- 1988-1995 Chevrolet K3500
- 1968-1974 Chevrolet K20 Pickup
- 1968-1974 Chevrolet K30 Pickup
- 1968-1974 GMC C15/C1500 Pickup
- 1968-1974 GMC C15/C1500 Suburban
- 1968-1974 Chevrolet C20 Pickup
- 1968-1974 Chevrolet K10 Pickup
- 1968-1974 Chevrolet K10 Suburban
- 1968-1974 Chevrolet C30 Pickup
- 1967-1973 Chevrolet Chevelle
- 1968-1974 GMC C25/C2500 Pickup
- 1968-1974 GMC C25/C2500 Suburban
- 1968-1974 GMC C35/C3500 Pickup
- 1968-1974 GMC K15/K1500 Pickup
- 1968-1974 GMC K15/K1500 Suburban
- 1968-1974 GMC K25/K2500 Pickup
- 1968-1974 GMC K25/K2500 Suburban
- 1968-1974 GMC K35/K3500 Pickup
- 1968-1974 Chevrolet C10 Pickup
- 1975-1980 Chevrolet C10
- 1970-1975 Chevrolet Monte Carlo
- 1967-1972 Chevrolet Camaro
- 1967-1972 Chevrolet Biscayne
- 1991-1995 GMC K2500
- 1976-1980 Chevrolet K10
- 1991-1995 Chevrolet K2500
- 1991-1995 Chevrolet C2500
- 1987-1991 GMC R2500 Suburban
- 1987-1991 GMC R3500
- 1971-1975 GMC Sprint
- 1987-1991 GMC V3500
- 1990-1993 Chevrolet C1500
- 1969-1972 Chevrolet Kingswood
- 1975-1978 GMC C25 Suburban
- 1975-1978 GMC C35
- 1973-1976 GMC Jimmy
- 1992-1995 GMC K2500 Suburban
- 1992-1995 Chevrolet C2500 Suburban
- 1992-1995 Chevrolet K2500 Suburban
- 1975-1978 GMC C15
- 1975-1978 GMC C15 Suburban
- 1975-1978 GMC C25
- 1969-1972 Chevrolet Townsman
- 1969-1972 Chevrolet Brookwood
- 1992-1995 Chevrolet C3500HD
- 1976-1978 Chevrolet K5 Blazer
- 1989-1991 Chevrolet R2500 Suburban
- 1989-1991 Chevrolet R3500
- 1989-1991 Chevrolet V3500
- 1976-1978 GMC K25
- 1976-1978 Chevrolet K20
- 1973-1975 Chevrolet Laguna
- 1987-1989 GMC R2500
- 1987-1988 Chevrolet R20
- 1987-1988 Chevrolet R20 Suburban
- 1987-1988 Chevrolet R30
- 1987-1988 Chevrolet V20 Suburban
- 1987-1988 Chevrolet V30
- 1975-1976 GMC G25
- 1976-1977 GMC K25 Suburban
- 1973-1974 Chevrolet G10 Van
- 1973-1974 Chevrolet G20 Van
- 1973-1974 Chevrolet G30 Van
- 1979-1980 GMC C1500
- 1979-1980 GMC C1500 Suburban
- 1973-1974 GMC G35/G3500 Van
- 1969-1970 Chevrolet Nova
- 1973-1974 Chevrolet Blazer
- 1969-1970 Chevrolet Estate
- 1989 Chevrolet R2500
- 1990 Chevrolet V2500 Suburban
- 1976 GMC G35
- 1976 GMC K15
- 1980 GMC K1500
- 1976 Chevrolet G20
- 1968 Chevrolet Chevy II
Specs:
| Application | Big Block Chevy |
|---|---|
| Brand | Flowtech |
| Collector Diameter | 4.00 inch |
| Emission Code | 4 |
| Engine | Big Block Chevy |
| Finish | Natural |
| Header Finish | Natural |
| Header Style | Upright |
| Primary Tube Dia. | 2-1/4 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
4.8 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 1
garbage spark plugs
misfired after 30 minutes of driving cylinder 4 misfire code, left me stranded on the highway with baby in car. “(9621)” at the end of description is a lie, was not compatible with my vehicle even with compatibility test.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
★★★★★ 5
Fits 2011 335xi n55 prefect
Fits my 2011 335xi n55 engine perfectly. Comes on and off easily and gets the filter loose quickly. Amazing quality
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 15, 2026
★★★★★ 5
Works perfect for BMW S63 engine.
I used this to change the oil on my BMW M8 with the S63 engine. It was a perfect fit. It extended far enough onto the filter housing to be quite secure with no risk of slipping off and stripping the housing. It was snug on the housing and did not bind up due to having a loose fit. The tool feels well-built and I suspect it will outlive me given my occasional personal use. It would still probably hold up well even for daily shop use as long as it was not abused (repeatedly dropped, slammed around, etc).
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Reviewed in the United States on September 8, 2025
★★★★★ 5
Made well and great fit
Fits perfectly and is made well
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Make sure you know the size
Yes worked like a charm
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Reviewed in the United States on April 5, 2026