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"> 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"> 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"> LS3 255cc 4.000" (+) Bore - Pair Black Label CNC Cylinder Head-www.studiopygmalion.com
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LS3 255cc 4.000
LS3 255cc 4.000
LS3 255cc 4.000
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LS3 255cc 4.000" (+) Bore - Pair Black Label CNC Cylinder Head

Marsoni M251S
Sale price$2024.50
Pay 4 payments of $506.12 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
LS3 255cc 4.000" (+) Bore - Pair Black Label CNC Cylinder Head>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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Your LS3 255cc 4.000" (+) Bore - Pair Black Label CNC Cylinder Head orders ship within 1-2 business days.

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  • Standard: 3-7 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]
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4.5 ★★★★★
Based on 2317 reviews
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Product Reviews
D
Verified Purchase
Dave Murray
Whiting, US
★★★★★ 5
Good as new
Size: Package Dimensions ‎6.02 x 4.02 x 2.05 inches
Fitment was great and works as it should. Good quality
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2025
K
Verified Purchase
Kenny
Waukegan, US
★★★★★ 3
Incorrect motor listed. Far smaller impeller than what's in the 6 horse johnson.
Size: For 5.5HP 6HP 7.5HP
It seems to be of good quality. However it does not fit a 6 horse johnson as it states. Therefore it will not pump water or function for my purposes. It was a waste of money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 15, 2025
O
Verified Purchase
Outcast
San Leandro, US
★★★★★ 5
Good product
Worked for what I needed. Fit great and easy to install.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 24, 2026
R
Verified Purchase
R
Carnegie, US
★★★★★ 5
Old Merc Inline 6s - 1500, 1400, 1250, 1150
This is the second time I purchased from them. The kits are good quality, and impeller is durable. Pictures is the initial one I purchased from them two seasons ago. It had hundreds of hours on it, plus me accidentally cooking it for 3 mins without water hooked up to the engine - which is why I purchased it again. Given 2 seasons of use and my recent screw up it held up well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 11, 2024
J
Verified Purchase
Justin D.
Birmingham, US
★★★★★ 4
Merc black max 150
Good fit
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 16, 2024

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