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"> LS7 305cc 4.125" (+) Bore - Pair Black Label CNC Cylinder Head - Jesel Pattern - Solid Roller-de
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LS7 305cc 4.125
LS7 305cc 4.125
LS7 305cc 4.125
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LS7 305cc 4.125" (+) Bore - Pair Black Label CNC Cylinder Head - Jesel Pattern - Solid Roller

Marsoni M251S
Sale price$1765.47
Pay 4 payments of $441.37 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
LS7 305cc 4.125" (+) Bore - Pair Black Label CNC Cylinder Head - Jesel Pattern - Solid Roller>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 LS7 305cc 4.125" (+) Bore - Pair Black Label CNC Cylinder Head - Jesel Pattern - Solid Roller orders ship within 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.
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4.2 ★★★★★
Based on 1345 reviews
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Product Reviews
A
Verified Purchase
Amazon Customer
Waukegan, US
★★★★★ 1
No fluff to fill
Style: Medium/Firm, Size: Queen
Arrives vacuum packed; not a problem with that; however, a week after opening the pillows are still flat. I thought they might still work for my pillow shams - not what they were bought for, but they didn’t fill out the shams either. Sad as I really like Serra brand normally.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 2, 2026
Y
Verified Purchase
yvonne wood
Whiting, US
★★★★★ 5
Pillows
Style: Medium/Firm, Size: King
Those are wonderful pillows!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2025
R
Rhiannon
Phoenix, US
★★★★★ 4
Keep their form for a bit
Style: Medium/Firm, Size: Queen
These pillows are fairly good quality, and keep their form better than what you might pick up at the end of the row at a big box store. After about a month of regular use, they've collapsed visibly from what they were on the first day, but still provide support. They are shipped flat in a container and take some time to plump up, but I didn't notice any strong odor on opening. Like most foam pillows, I expect a trip through an electric clothes dryer will probably fluff the pillows up again. I don't know what makes these "down alternative" as oppose to a regular foam-filled pillow, and there is a sharp distinction from my down pillow. Most notably, the down pillow provides much more support. There would be no mistaking one of these for a down pillow.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 12, 2023
K
Verified Purchase
Katherine H
Dallas, US
★★★★★ 1
Not firm at all
Style: Medium/Firm, Size: Queen
The pillows are listed as firm and they are not fi at all. My kids will enjoy sleeping with them, but not my husband or myself. Total disappointment!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 22, 2022
R
Verified Purchase
Richard F.
Bozeman, US
★★★★★ 5
Pillow
Color: White, Size: Standard/Queen
Very comfortable
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 3, 2025

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