Exhaust Headers For 1982-2002 Chevy S10 / S15 / Blazer SBC V8 283 302 305 307 327 350 400 Engine 2WD

Q1: Will these S10 V8 headers fit my 350 small block swap?

A1: Yes. These S10 V8 headers are built for small block Chevy V8 swaps—283, 302, 305, 307, 327, 350, and 400 SBC all bolt up. The 1.5" primary tubes and 2.5" collector are sized to clear the S10 chassis. But pay attention to the fitment rules: 2WD only, and they only work with TH350 automatic transmissions that have floor shifters. If you're running column shift or a different trans, these won't work.

Q2: Do these SBC S10 headers work with angle-plug cylinder heads?

A2: No, and the manufacturer calls this out specifically. Angle-plug cylinder heads position the exhaust ports at a different angle than standard straight-plug heads, and the primary tube routing on these headers doesn't account for that offset. You'll either have fitment issues at the flange or the tubes will hit the chassis. If you're running angle-plug heads on your SBC, you need headers designed for that configuration—these aren't them.

Q3: Can I use these S10 V8 swap headers with a 4WD truck?

A3: These are listed for 2WD applications only. On a 4WD S10 or Blazer, the front differential and shock towers eat up the space where the collector and primary tubes need to route. Some guys on the forums have made fenderwell headers work on 4WD trucks by removing the factory shock towers, but that's a major suspension modification. If you're not willing to go that far, look for headers specifically designed for 4WD S10 V8 swaps.

Q4: Will these headers clear the steering column on a floor-shift TH350?

A4: Yes, with the correct setup. These headers are designed to clear the steering shaft when you're running a TH350 with a floor-mounted shifter. That's the exact combination they were engineered for. The problem comes when you deviate from that formula—column shift setups have linkage that runs right through the header path, which is why they're explicitly excluded from fitment. If your swap uses a different transmission, verify clearance before buying.

Q5: Are these fenderwell exit headers or under-chassis?

A5: These are fenderwell headers. The collector exits through the inner fender panels rather than routing underneath the chassis. For an S10 V8 swap, this is usually the better option—the engine bay is tight, and under-chassis long tubes tend to hit the crossmember or steering shaft. You will need to cut the inner fender panels for the tubes to pass through. That's standard for any fenderwell header on this platform.

Q6: What size exhaust should I run after these S10 headers?

A6: The 2.5" collector pairs well with a 2.5" dual exhaust setup. For a mild 350 making 300-350 hp, that's all you need. If you've built a stout small block north of 400 hp, you could step up to 3" after the collector, but fitting 3" pipe under an S10 is a tight squeeze. Most people run 2.5" and don't look back. The fenderwell exit also makes it easier to route dual exhaust straight back along the framerails.

Q7: Can I install these S10 V8 swap headers by myself?

A7: You can, but give yourself a full weekend and patience. The S10 engine bay wasn't designed around a V8, so you're working in cramped quarters. You'll need to jack the engine slightly to get the headers past the frame rails, and cutting the inner fenders is required for the fenderwell exit. The listing says "direct bolt-on, no modification needed," which is true for the header-to-engine connection—but the fender cutting and any steering linkage adjustments are on you. No install guide is included.

Q8: Do I need to retune after installing SBC headers on my S10?

A8: If you're running a carbureted small block, plan on re-jetting. Headers flow more air, so the carb needs more fuel to keep up. On an EFI setup—whether that's TBI, a Holley Sniper, or whatever you're running—a retune is mandatory. The motor will run lean at part throttle with the increased exhaust flow, and running lean under load is a fast way to burn up pistons. Check your air-fuel ratio after the swap.

Q9: What gaskets and hardware come with these headers?

A9: The listing says all necessary hardware, bolts, and gaskets are included. That said, the gaskets that ship with most aftermarket headers are thin composition-type gaskets that tend to blow out within a few thousand miles, especially on a V8 swap that runs hotter than stock. Spend the extra $20 on quality gaskets—copper dead-soft seals or OEM-style composition gaskets. For bolts, Stage-8 locking header bolts are worth every penny if you can find them in the right size. Header bolts back out on their own. It's just what they do.

Q10: Are these S10 headers street legal in California?

A10: No. These headers do not carry a CARB Executive Order number, which means they're not legal for street use in California or any state that follows California emissions standards. California Vehicle Code Section 27156 prohibits modifying the exhaust system in a way that alters or defeats emissions controls. These are sold for off-road and track use only. In states without emissions testing, enforcement varies, but the legal classification is the same.

Q11: How do these headers compare to the stock exhaust manifold on an S10 V8 swap?

A11: Stock manifolds are heavy cast iron and create back pressure because all four cylinders dump into a single log-style chamber. These S10 V8 headers give each cylinder its own tube, so exhaust gases exit without fighting each other. The result is more horsepower, better throttle response, and a sound that actually sounds like a V8 instead of a wheezing tractor. The trade-off is that headers are thinner steel, so they're more susceptible to rust if you live where roads get salted, and installation is more involved.

Q12: Will these S10 headers work with a big block Chevy?

A12: No. These are small block Chevy headers only. A big block (396, 427, 454) has different exhaust port spacing and a wider block, so the flanges won't line up and the tube routing won't clear the chassis anyway. The fitment exclusions are clear: SBC only. BBC guys need headers designed specifically for big block swaps, and even then, fabrication is almost guaranteed on an S10 chassis.