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Factory Mast LT Cylinder Head - Dual Valve Spring & Titanium Retainer Kit - 0.660 Lift
Factory Mast LT Cylinder Head - Dual Valve Spring & Titanium Retainer Kit - 0.660 Lift
Factory Mast LT Cylinder Head - Dual Valve Spring & Titanium Retainer Kit - 0.660 Lift
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Factory Mast LT Cylinder Head - Dual Valve Spring & Titanium Retainer Kit - 0.660 Lift

Marsoni M251S
Sale price$185.47
Pay 4 payments of $46.37 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
Factory Mast LT Cylinder Head - Dual Valve Spring & Titanium Retainer Kit - 0.660 LiftFits Factory Mast LT and GM OE Casting Heads Factory Valve Guide Specs: Rated Valve Lift 0. 660 inches Installed Height 1. 800 @ 166 lbs Spring Rate: 403# in Solid Height 1. 015 Spring OD 1. 310" Spring ID 0. 680" Works with aftermarket 0. 575 Valve Guide Kit includes: Dual Valve Springs Titanium Retainers Custom Thick Chrome Moly Spring Seats Valve Stem Seals Billet Machined Chrome Moly Valve Locks Product Details: Manufactured in the USA Premium
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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
4.8 ★★★★★
Based on 699 reviews
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Product Reviews
M
Verified Purchase
Mrs. B
Whiting, US
★★★★★ 5
A Good Buy
Item Package Quantity: 2, Size: Queen
Marvelous. Firm, fluffy, and comfortable. A good buy
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
L
Verified Purchase
lex
San Leandro, US
★★★★★ 5
such amazing pillows
Item Package Quantity: 2, Size: Queen
THESE PILLOWS , idk if its because I haven't bought new pillows since I was little ? but these pillows are so soft and fluffy ! the support and shape retention are an easy 10/10 the Material seriously feels like hotel level luxury . so 10/10 appearance wise they look amazing with my pillow case . 10/10 overall these are MY reviews so make sure yall read the description and make sure its FOR YOU
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
O
Verified Purchase
Ober
Port Orchard, US
★★★★★ 5
Neck posture/sleep pain improvement
Item Package Quantity: 2, Size: King
Pleasantly surprised. Only had for a week now, but bought to replace these old bamboo pillows that were so flattened it was causing shoulder pain or neck tightness maybe. But that has already improved my sleep just from using this week. Ordered the kings, they come vacuum sealed and so I opened and they sat for approx 24 hours or close enough. They didn't appear as puffy so I was a little doubtful but I punched and fluffed them myself and they were good. They have improved the quality of my sleep so far. They are soft and sounds weird but it's almost like your head weight or fluffing them activate it to be fully expanded afterwards. I like them, they're comfortable for me as a mainly side sleeper/sometimes back sleeper.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
G
Verified Purchase
Glynndy Oskouian
Draper, US
★★★★★ 4
Didn’t hold its shape after 1 month.
Item Package Quantity: 4, Size: Queen
been using this pillow for about a month now, and here’s my honest take. At first, it was super comfortable — soft, supportive, and perfect for getting a good night’s sleep. It gave great neck support and felt like a solid upgrade. But after a few weeks, I did notice it started to lose its shape a bit. It’s still comfortable, just not as supportive as when I first got it. I find myself fluffing it more often now.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 1, 2026
B
Verified Purchase
Bettie Sixx
Waukegan, US
★★★★★ 5
Finally found my pillow
Item Package Quantity: 1, Size: Standard
I've been looking for a comfortable pillow for years & this is it! This pillow is PERFECT and great value, love it thank you!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 7, 2026

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