Cathedral Port 295cc 4.125" (+) Bore - Pair Black Label CNC Cylinder Head - Jesel Pattern

Marsoni

M251S

$2024.50

Get it in 3 business days with 1 day shipping. Friday, May 29

Cathedral Port 295cc 4.125" (+) Bore - Pair Black Label CNC Cylinder Head - Jesel Pattern>Download the cylinder head spec sheet< The Mast Motorsports cylinder head product line is completely manufactured from a raw casting to a finished cylinder head in the USA located in Nacogdoches Texas. Mast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality. When buying Mast Cylinder heads, you are getting the highest level of quality and performance on the market. Full Send, no compromises, no

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Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
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Edit: Still holding proper pressure at 2-months !!! Had a slow leak where my tire went from 44psi to ~18psi over 2-3 days… Dashboard light would let me know every few days that I had a tire problem and I would inflate the tire back up to 44psi… Anyway, I used this product and filled air back to 44 psi and it’s held the pressure for a month already !!!! Be sure to deflate tire to ~15 PSI before adding the product… it only took about 30 seconds to empty the container into my tire with the tire pressure low. Very happy with this product !!!

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Reviewed in the United States on April 6, 2026

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Kindle Customer

Alexandria, US

★★★★★ 5

Excellent stuff!

Style: 18oz

Used this on a Z-Trac with a flat and it fixed it and has held up for over 8 months.

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Reviewed in the United States on May 11, 2026

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