Product Summary

Dead Soft Copper Gasket Material, Copper

  • ThermoTight dead soft copper gasket material is .040-inch thick and seals headers or manifolds by conforming to their surfaces
  • Copper header gaskets are reusable, making them the perfect solution for performance engines that often see teardown
  • Will not turn brittle, burn up, shrink, or blow out like common paper/fiber exhaust gaskets on the market
  • Copper exhaust gaskets are preferred for high heat applications like turbochargers and high rpm use
  • Sold in pairs and compatible with square exhaust port small block Chevy applications
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Key Specs

MFG. Part #91013710
BrandSpeedway Motors
Gasket MaterialDead Soft Copper
Overall Thickness.040"
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Need To Know

Quick and Easy Returns

Return Policy

Speedway Motors 91013710 Details

  • Cut from .040-inch thick dead soft copper sheet material
  • Reusable copper header gaskets provide ultimate sealing, even on irregular surfaces
  • Raised ridge port seal enhances sealing and prevents blow outs
  • Natural high temperature use that will not burn or deteriorate like paper gaskets
  • Best gasket option for high performance use, turbo setups, and more
  • Square exhaust ports feature 1.38-inch x 1.38-inch inside dimensions
  • Exhaust port opening can be enlarged up to 1.50-inch x 1.50-inch
  • Copper gaskets seal most any manifold or header to your square port SBC heads
  • Seals imperfect header and cylinder head surfaces that paper gaskets can’t

Stop Wasting Money on Cheap Paper Exhaust Gaskets

When buying headers for your ride many of the brands you’ll find provide gaskets and header bolts in the box for a complete installation solution. While this is admirable of the manufacturer, often the included header gaskets (and even the bolts at times) are made from subpar materials to keep product costs down while providing this “everything you need in one box” purchase mentality. The truth of the matter is that these paper/fiber header gaskets may help get your headers installed but they certainly will not seal very well or last exceptionally long. The main issue is sealing. Both the headers and even the cylinder head port surface can have irregularities that cause the gasket to not seal and to be easily blown out. Add to that issue that paper based gaskets often can’t handle the intense exhaust heat in some applications and will burn/turn hard, causing leaks as well. The answer? High quality ThermoTight dead soft copper gaskets that form over minor imperfections for a better seal that are also reusable, saving you money overall.

Dead Soft Copper for Superior Sealing and Reusability

Paper and other fiber-based gaskets are not the best materials to use for sealing exhaust systems. Sure, you can slather on a bunch of silicone or other gasket maker to help but that just makes a mess of your engine and headers. What about soaking those paper gaskets in water to expand them for a better seal? Sure, it’s an old hot rodder trick that might help, once! Or the gaskets may completely fall apart on you. No, the best sealing is offered via materials like dead soft copper. Stamped from .040-inch thick dead soft copper gasket material, this malleable material easily conforms to header exhaust port weld beads and other tough sealing issues like gouges or even minor corrosion pitting on the exhaust face of your cylinder heads or headers/manifolds.

The dead soft copper header gaskets maintain their softness and have no annealing properties so the copper exhaust gaskets can be formed repeatedly to maintain the best seal use after use. This makes the ThermoTight copper exhaust gaskets perfect for engines that see a lot of header or manifold removal like race cars, engines that see a lot of tear down like turbo setups, or enthusiasts that like to change headers with under car exhaust to zoomies or outside the frame lake pipe setups on their SBC powered rides for an event or cruise. The embossed sealing ridge on the SBC copper header gaskets (which always faces the header flange) helps sealing even further by adding additional conformity to the material, while helping to maintain the gaskets reusability and durability.

Overcome High Heat Exhaust Gasket Failures, Blowouts, Leaks, and More

Copper is used in wiring because it is a great conductor, both of electricity and heat. Being a solid thermal conductor, copper makes for an excellent exhaust gasket material. The engine’s exhaust heat at the exhaust face of the cylinder head is quickly and easily transferred to the exhaust header tubing via the copper exhaust gaskets to be carried away from the engine via exhaust flow and radiant air flow around the header tubes. Paper-type gaskets are the exact opposite, as paper is an insulator, holding in those high exhaust temperatures. This insulating effect is what burns the exhaust gasket, turning it brittle and causing leaks and blow outs where gasket coverage is thin. 

Paper gaskets also “set” over time, which is why most manufacturers recommend constant header bolt tightening. The bolts aren’t backing out, the gasket is shrinking/setting, and the bolts require tightening to apply clamping force on the paper gaskets again to maintain proper sealing. With the use of ThermoTight dead soft copper header gaskets for your SBC square port heads you won’t have to worry about header bolts being a maintenance issue, as the copper gasket material does not shrink or blow out like paper gaskets do. You can always add locking header bolts for extra piece of mind as well. ThermoTight copper gaskets work extremely well as copper exhaust manifold gaskets too if you’re having issues sealing original iron exhaust manifolds.

Solve your exhaust gasket sealing problems with our ThermoTight dead soft copper gaskets and put exhaust leaks behind you. Easy to install, reusable, and premium materials at an excellent value that are perfect for high performance engines used in serious street cars or racing and for extensive high heat applications like supercharged or turbocharged builds. What’s not to like? Don’t forget dead soft copper header collector gaskets too for a complete header sealing solution! We offer copper header collector gaskets in all popular 3-bolt flange sizes.

Speedway Motors 91013710 Specifications

KEY SPECS
MFG. Part #91013710
BrandSpeedway Motors
Gasket MaterialDead Soft Copper
Overall Thickness.040"
GENERAL
Material TypeCopper
Port StyleSquare Port
Port Height1.38"
Port Width1.38"
Sold in QuantityPair
NotesPort opening can be enlarged up to 1.50" x 1.50" and can fit AMC 290–401, SBC 262–400, and BB Chrysler 383–400 applications with minor trimming

Ratings & Reviews

5

23 Reviews

Overall Assessment

Product has high quality and durability, testified by users over long periods of personal and professional use. Copper gaskets outlast composite ones, noted for their excellent seal and fit, even in high-temp conditions. They're perfect for vintage car builds like '57 Chevy or '72 El Camino SS. Remarkable for their leak-free performance, users prefer this product to cheaper alternatives. Gaskets are deemed best in their category, delivering brilliant toughness, sealing, and lasting longer than competitors' products.

5

23 reviews

5

23

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I would definitely buy this product again.

5.0

10 months ago

fishhead

Temecula, CA

Verified

Header exhaust gaskets

Would Recommend

Worked great

5.0

a year ago

Bill

Bandon, OR

Verified

Gaskets were solid 1 piece copper, installed easy, retorqued bolts 2 different times after a couple heating cycles. No leaks!

Would Recommend

Yes

5.0

a year ago

601Gapband

Jew city

Verified

Prefect fit

I will buy again

5.0

2 years ago

Wiz

Casey, IL

Verified

Nice heavy duty gaskets!

Would Recommend

Love it

5.0

2 years ago

Edward Barrett

Chicago

Verified

Excellent product

Would Recommend

Great value

5.0

2 years ago

Driver

San Diego

Verified

This gasket Will allow me to blueprint My custom made headers. I Will tailor it to My CNC'ed custom heads.

Would Recommend

always good if I make the correct choice

5.0

3 years ago

none

midwest Indy

Verified

yous a good gasket sealer High temp

Would Recommend

Spend a little extra for these

5.0

4 years ago

Heidiho

Nebraska

Verified

Had bought composite gaskets, they break too easily. These copper ones don't. Simple as that.

Would Recommend

I would buy this product again, as a matter of fact I am a .

5.0

4 years ago

Charlie

Mannford Oklahoma

Verified

I used these on a 57 Chevy that I built a few years ago and now I'm using them on my 72 Elcamino SS

Would Recommend

Great fit.

5.0

4 years ago

Coach

Capitol Heights, MD

Verified

Great snug fit.

Would Not Recommend

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Showing 10 of 23 reviews

Questions & Answers

3 Questions • 3 Answers

How many times can you reuse before it is suggested to replace?

by Jr

• 2 years ago

1 answer

Will these fit vortec heads and Schonfeld headers?

by Mat

• 9 years ago

1 answer

What direction do the raised port ridges face? towards the head or towards the header flange?

by hotrod10

• 10 years ago

1 answer

3 of 3 questions shown

Fitment

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  • Gen 1 L03 Small Block Chevy

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  • Gen 1 L03 Small Block Chevy

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  • Gen 1 L48 Small Block Chevy

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  • Gen 1 L46 Small Block Chevy

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  • Gen 1 L81 Small Block Chevy

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  • 2-Piece Rear Main 305 LG4

  • 2-Piece Rear Main 305 LG4

  • Gen 1 L82 Small Block Chevy

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  • 2-Piece Rear Main 305 LG4

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

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  • Gen 1 L05 Small Block Chevy

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  • Gen 1 L79 Small Block Chevy

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  • 327 Chevy Small Block V8

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  • Gen 1 L69 Small Block Chevy

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  • 1-Piece Rear Main 305 LB9

  • Gen 1 L98 Small Block Chevy

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  • 2-Piece Rear Main 305 LG4

  • Gen 1 L48 Small Block Chevy

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  • 2-Piece Rear Main Chevy 350

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  • Gen 1 L03 Small Block Chevy

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  • Gen 1 L82 Small Block Chevy

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  • Gen 1 L05 Small Block Chevy

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  • Vortec L31 Small Block Chevy

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  • 2-Piece Rear Main Chevy 350

  • Gen 2 LT1 Small Block Chevy

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  • Gen 1 L03 Small Block Chevy

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  • Gen 1 L05 Small Block Chevy

  • Vortec L30 Small Block Chevy

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  • Gen 1 L05 Small Block Chevy

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  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

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  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

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  • Gen 1 L65 Small Block Chevy

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  • Gen 1 LG3 Small Block Chevy

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  • Gen 1 LG3 Small Block Chevy

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  • Gen 1 L05 Small Block Chevy

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  • Gen 1 L65 Small Block Chevy

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  • Gen 1 L82 Small Block Chevy

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  • Gen 1 L65 Small Block Chevy

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  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • 2-Piece Rear Main 305 LG4

  • 2-Piece Rear Main 305 LG4

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L30 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

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  • Gen 1 L82 Small Block Chevy

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  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

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  • Gen 1 L46 Small Block Chevy

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  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main 305 LG4

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • 2-Piece Rear Main 305 LG4

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main 305 LG4

  • Gen 1 L48 Small Block Chevy

  • 2-Piece Rear Main 305 LG4

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main 305 LG4

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 L79 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main 305 LG4

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L48 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main 305 LG4

  • 2-Piece Rear Main 305 LG4

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main 305 LG4

  • 2-Piece Rear Main 305 LG4

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L48 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 LE9 Small Block Chevy

  • 327 Chevy Small Block V8

  • 2-Piece Rear Main Chevy 350

  • 327 Chevy Small Block V8

  • 2-Piece Rear Main Chevy 350

  • Vortec L31 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 327 Chevy Small Block V8

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 327 Chevy Small Block V8

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L05 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L05 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L98 Small Block Chevy

  • 327 Chevy Small Block V8

  • 327 Chevy Small Block V8

  • 327 Chevy Small Block V8

  • 327 Chevy Small Block V8

  • Gen 1 LE9 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LE9 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L03 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L98 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • 327 Chevy Small Block V8

  • 327 Chevy Small Block V8

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • 327 Chevy Small Block V8

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L98 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L98 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 LM1 Small Block Chevy

  • Gen 1 L69 Small Block Chevy

  • Gen 1 L76 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L76 Small Block Chevy

  • 350 Chevy Small Block V8

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L98 Small Block Chevy

  • 350 Chevy Small Block V8

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L98 Small Block Chevy

  • 350 Chevy Small Block V8

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L98 Small Block Chevy

  • 350 Chevy Small Block V8

  • Vortec L31 Small Block Chevy

  • 305 Chevy Small Block V8

  • 2-Piece Rear Main 305 LB9

  • 2-Piece Rear Main 305 LG4

  • Gen 1 L69 Small Block Chevy

Customer Impersonation Script