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Big Bore V4 Exhaust Spacer


Free shipping. Price includes a refundable $15 core charge.

Modified exhaust spacers to match the exhaust port diameter.

Note: Final image shows example of a reusable core spacer.

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When you port the cylinder heads on your V4 you need to match that with an improved exhaust system. That includes bored-out spacers to match the exhaust ports and exhaust header inside diameter.

I machine these to your specifications. Measure the exhaust port on your cylinder head and I will match that diameter. I also machine the engine mating surface of the spacer to ensure a good seal. In practice this makes a gasket optional.

Price is for one set of two spacers modified to your specifications.

I have a few sets on hand but request that you send yours to be modified. I will refund a USD $15 core charge once I receive your original reusable parts.

When you place your order I will contact you for:

  • The inside diameter measurement desired.
  • Shipping instructions for the core parts.


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