SBC Engine Swap Headers for Chevrolet S-10 Blazer GMC Sonoma Jimmy (1982-2002) 4.6L 5.0L 5.4L 5.7L 6.6L

High-Flow SBC Engine Swap Headers for 1982-2002 Chevrolet,GMC S-10,Blazer,Sonoma,Jimmy (GMT325 / GMT330)

What it Does: The SBC Engine Swap Headers route exhaust gasses around tight frame rail clearances when dropping a Small Block Chevy Gen I V8 into the 1982-2002 GMT325 / GMT330 chassis to maximize scavenging and mid-range torque.

The Stock Chevrolet,GMC S-10,Blazer,Sonoma,Jimmy Engine Bay Clearance Bottleneck

Swapping a Small Block Chevy (SBC) into the compact GM S-Series engine bay creates immediate packaging conflicts with factory steering shafts, control arms, and tight chassis rails. Factory cast-iron exhaust manifolds choke exhaust gas velocity, retain extreme thermal energy in the engine bay, and physically collide with the S-10 frame crossmembers during V8 conversions, leaving virtually zero space for proper exhaust evacuation.

The Engineering Solution

Engineered specifically for V8 swap geometry, these conversion headers feature 1-1/2-inch mandrel-bent primary tubes crafted from durable T-304 stainless steel to optimize gas velocity and scavenging across the rev band. The tubes transition into high-flow 2-1/2-inch collectors with rigid, CNC-machined head flanges (1.58" H x 1.480" W ports) and precision TIG welds that resist warpage under extreme thermal cycles. Clearanced specifically for tight frame pockets, they bolt directly to traditional straight-plug cylinder heads while preventing heat-soak near steering linkages.

What's Included

• 1 Engine Swap Header Kit (Driver-Side Left & Passenger-Side Right)
• Cylinder Head Exhaust Gaskets
• Installation Hardware and Mounting Bolts

Technical Specifications

Compatibility

• 1982-2002 Chevrolet S-10 Pickup (2WD Only)
• 1983-2002 Chevrolet S-10 Blazer / Blazer (2WD Only)
• 1982-2002 GMC S-15 / Sonoma Pickup (2WD Only)
• 1983-2002 GMC S-15 Jimmy / Jimmy (2WD Only)
• Engine Compatibility: Small Block Chevy 283 (4.6L), 302/305/307 (5.0L), 327 (5.4L), 350 (5.7L), 400 (6.6L) with straight-plug heads

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT325 / GMT330 S-10,Blazer,Sonoma,Jimmy?

Yes, this is a bolt-on conversion fit for 1982-2002 2WD models swapped with standard straight-plug SBC Gen I engines. Does NOT fit 4WD models, angle-plug cylinder heads, or stock 2.2L, 2.5L, 2.8L, and 4.3L factory manifolds. Transmission fitment is limited strictly to TH350 floor-shift automatics.

Will standard spark plug boots clear these primary tubes?

Straight-plug boots clear standard 1-1/2-inch primaries, but high-temperature 90-degree boot sets or heat socks are recommended for optimal wire clearance.

The Chevrolet,GMC Truck Performance Standard

Engineered for high-torque street builds and aggressive mini-truck swaps, this T-304 stainless steel header kit provides rigid flange sealing and high-flow scavenging to handle heavy throttle loads without cracking under stress.