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Instruction Sheets for Part Number BIG-11500FLT
Charts & Guides for Part Number BIG-11500FLT
Headers, Long Tube, Steel, Painted, Chevy, GMC, Small Block, Pair
See More Specifications
Estimated Ship Date: Monday 10/19/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
11500FLT
Part Type:
Product Line:
Summit Racing Part Number:
BIG-11500FLT
UPC:
787480115003
Header Style:
Long tube one-piece
Header Material:
Steel
Primary Tube Outside Diameter (in.):
1 1/2 in.
Header Color:
Temporary non-high temperature paint
Flange Style:
Standard
Weld-Up:
No
Collector Attachment:
3-bolt flange
Collector Diameter (in.):
3.00
Collector Reducers Included:
Yes
Collector Reducer Exit Diameter:
2.500 in.
Tuned:
No
Primary Tube Gauge:
18-gauge
Spark Plug Position:
Straight
Flange Thickness (in.):
0.31 in.
Bolts/Studs Included:
Yes
Gaskets Included:
Yes
Crossover Pipe Included:
No
Catalytic Converter(s) Included:
No
Motor Mounts Included:
No
Transmission Mount Included:
No
Quantity:
Sold as a pair.
Notes:
The paint applied to these headers is a temporary coating only and is designed to burn off during use. High temperature paint or other high temperature coatings are recommended.
Flowtech Headers
These Flowtech headers fit small block Chevy engines for for Chevy and GMC 1966-91 model year vehicles. These long-tube (or full-length) headers are steel constructed and are come with a painted finish. All tubing is mandrel-bent to provide consistent tubing diameter for smooth flow and increased exhaust velocity. Extra-thick, machined header flanges provide a leak-free seal and maximum strength. All mounting hardware and premium gaskets are included.
Depending on application, features may include:
* Leakproof O-ringed port seals on select headers
* Available to work with factory power steering and power brakes
* Where applicable, welded-in collector merge spears control exhaust gas re-entry into primary tubes
Important notes: Breaking in an engine with ceramic coated headers WILL result in damage to the coating and will VOID all warranties. Ceramic coated headers require several heat cycles to fully cure before they will withstand extreme heat. Hooker recommends using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage. Flowtech does not recommend the use of header wraps as this will void the warranty.
Applications
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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