5.3L Cathedral Small Bore | Factory Mast | As Cast | Cylinder Head - Pair

5.3L Cathedral Small Bore | Factory Mast | As Cast | Cylinder Head - Pair

Marsoni

M251S

$1024.50

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

5.3L Cathedral Small Bore | Factory Mast | As Cast | Cylinder Head - Pair***Download the Tech Sheet Here*** We launched our Factory Mast product line to deliver an economical product line for our customers. You have come to love the "Black Label" Cylinder heads, but now you can get the same quality at a lower price without SACRIFICING performance. Manufactured using permanent mold technology, this casting is simply an amazing surface finish and quality. Mast refuses to compromise on materials and methods that may

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Your 5.3L Cathedral Small Bore | Factory Mast | As Cast | Cylinder Head - Pair orders ship within 1-2 business days.

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Fast: 2-3 business days
Express: 1-2 business days

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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.
To process your return/exchange, please contact us at [email protected]
Please click here for more details>>> Return & Exchange Policy

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

Verified Purchase

Kindle Customer

Los Angeles, 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

Verified Purchase