5.3/LS3 Small Bore | Factory Mast | As Cast | Cylinder Head - Single Bare

5.3/LS3 Small Bore | Factory Mast | As Cast | Cylinder Head - Single Bare

Marsoni

M251S

$457.48

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

5.3/LS3 Small Bore | Factory Mast | As Cast | Cylinder Head - Single BareIntroducing one of the first 5. 3 Liter LS3 cylinder heads designed for use with the LS3 intake without adapters. Optimized for 3. 780 bore diameter. ***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

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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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This product was definitely different than the original I have a 2001 Bayliner with a 3.0 MerCruiser and an alpha one second GEN drive The kit worked but the bottom gasket had a weird cut different than the original I added a gasket maker just in case (Yamaha Lube) Brand! All in all kit was fine, One thing to note is the directions that come with the kit at least for my version we’re not for the same alpha one second GEN 4 stroke kit that I got they were for a two-stroke in the pictures didn’t look the same as the parts that I had got which is fine but it’s miss leading when you send a 4 stroke kit but 2 stroke 90hp to 200hp alpha one directions! If it craps out this review will change

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Reviewed in the United States on June 30, 2020

Verified Purchase

Air Assault

Whiting, US

★★★★★ 5

Super great product. Has the power and functionality to get you repairing fast!

Super great product. Has the power and functionality to get you repairing fast! Fully recommend this and it has worked great since I've owned it. Still going strong in the durability and design looks like it will keep it going strong for many years. Highly highly recommend buying this. Will work in Kuwait, Iraq, UAE, and Saudi. Good for Camps around the CENTCOM area!

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Reviewed in the United States on October 6, 2025

Verified Purchase

Jed V

San Leandro, US

★★★★★ 5

Solid Product

worked well, easy to install.

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Reviewed in the United States on November 3, 2025

Verified Purchase

Omaha, US

★★★★★ 5

Excellent wire!

Size: 2 Colors each 10FT, Style: 10AWG

This wire is very soft and flexible. Many strands and tinned nicely. A perfect upgrade for my power wheel wires that keep melting. These have been running for months in exterior environment without any issues.

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Reviewed in the United States on October 31, 2025