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MOTORSPORT 6-1 Header, 70-76 240Z-260Z-280Z

MOTORSPORT 6-1 Header, 70-76 240Z-260Z-280Z

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Performance Exhaust Overview:
A performance engine is an integrated affair. When you modify one set of components, you have an effect on other systems. On a mildly modified engine, a minor upgrade in either the cam specs, exhaust system, or intake can be done independently. For performance, camshafts work best when integrated with upgrades in the exhaust and intake. The exhaust system is probably the first area to improve on any engine, because this will only enhance future modifications. The study of Physics tells us that we usually can't get "something for nothing", but when adding headers and improved exhaust components to an engine, we almost do. The improved exhaust flow and velocity derived from tubular headers and free flowing mufflers is one of the only modifications you can make to an engine which will improve both power and fuel economy.

  • (1) MSA 6-1 Header
  • (1) Header Style Manifold Gasket (Choose Fuel Type)
  • (1) Exhaust Adapter Kit (*See Exhaust Adapter Note Below)

Our "MOTORSPORT" 6-into-1 headers are built especially to our strict specifications for top performance. MOTORSPORT 6-1 headers are our best headers in overall performance, and are especially important for high-revving engines with large camshafts. The 1 1/2" diameter primary tubes are equal length to help keep your cylinders balanced, which is a key to proper performance of high rpm engines. The collector is straight 2 1/2" diameter to the flange. The thick main exhaust flange is flat machined to promote a consistent seal to the cylinder head. It also prevents warping and eliminates the need for spacer height modifications. Exhaust ports have high-quality welds to ensure leak-free performance. Special installation gaskets are included (do not use original equipment type exhaust gaskets with headers). This header configuration is for original 1970-1976 cylinder heads with "square" exhaust ports only.

Model Restrictions:
This header fits Manual Transmission models only. For original 70-76 cylinder heads only. (Note: For "round port" exhaust cylinder heads from 1977-1978 see part 15-6013 in Related Items.)

Head Casting Number:
While not required to place your order, it is helpful for us to know your engine's cylinder-head casting number. Some early Z-cars have had engine or cylinder-head swaps, which could have an effect in the determining the correct header for your unique application. If you know the cylinder-head casting number, simply type it in the box below. If you're not certain, just leave that field blank, complete your order, and we'll contact you to make certain you receive the right header the first time. Other companies may not take this extra step, but we're serious about your satisfaction. Please be sure we have your current daytime phone number or monitored email address so that your order may be expedited without delay.
head casting number example
Click the image above for an example.

Exhaust Adapter:
We strongly recommend using our Premium exhaust (part 15-6308 or 15-6309, shown in Related Items), which was custom designed with a front pipe and flange specifically for direct bolt up to the collector flange on the end of this header (no adapter will be necessary). This is the ONLY system that will fit without modifications and pipe bending (the front pipe on our other 2 1/2" exhausts will not fit properly). If you are going to build your own exhaust system in full or in part, choose the corresponding adapter above, depending on the pipe diameter of the exhaust you are going to use. Early Z stock exhausts were about 47mm in diameter (approximately 1 7/8"). For best performance, 2 1/2" diameter systems give the best power to L6 engines. Larger diameter exhausts will actually cause a loss in torque unless your engine has been built for competition, with extremely high cylinder pressures from our largest racing camshafts and very high compression. Please call if you have any questions.

Smog Legality:
Headers may not be street legal in some areas. Check with the motor vehicle code/department in your area. This header does not have any fittings for factory emissions (smog) equipment.

Protective Coating:
This header comes with a simple paint to help prevent damage to the metal during manufacturer processing and shipment. It is not permanent or high-temperature paint. Not only would pre-applied high-temperature paint complicate your own color or finish choice, but the manufacturer's post-welding handling and shipment process would damage the paint. Final High-temp paint should not be applied until you are ready to install the header onto your engine. You simply need to lightly sand the remaining protective paint on the surface of the header, and then apply the high-temperature paint of your choice. Most local paint stores will have a good selection of colors to match whatever under-hood scheme you are creating. For basic colors, POR-15 High Temperature Paint is an excellent option for a long lasting, extremely durable finish (see 80-8274 in Related Items). The same will be true of the adapter. Note: The adapters will fit very tightly, so do not over-coat the paint on the end of the header, or paint the inside of the adapter end. If you are interested in a long-lasting protective Ceramic coating, see part 15-6001CH in Related Items.

Model Guide:
Datsun 240Z, 260Z, 280Z

Code Guide:
Datsun S30

Year Guide:
1970, 1971, 1972, 1973, 1974, 1975, 1976

Attention California Customers:
WARNING: Cancer and Reproductive Harm -
Part Number:
Making selections in the following sections may change the final product price.
Input your casting number below: (If you aren't sure, leave blank and we'll contact you)
Stock Diameter Exhaust Adapter
2.5" Diameter Exhaust Adapter