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LS LS1 Coolant / Steam Port Block Off Plate Set
LS LS1 Coolant / Steam Port Block Off Plate Set
LS LS1 Coolant / Steam Port Block Off Plate Set
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LS LS1 Coolant / Steam Port Block Off Plate Set

Marsoni M251S
Sale price$29.99
Pay 4 payments of $7.50 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
LS LS1 Coolant / Steam Port Block Off Plate SetCoolant Steam Port Plugs Includes 2 coolant ports, 2 o rings, and 2 bolts Compatible with all GM LS series engines Can be installed on the front or rear of the cylinder heads Made in Wichita, Kansas from aerospace grade, USA produced, billet aluminum *These do NOT have holes for crossover tube attachment
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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
4.5 ★★★★★
Based on 188 reviews
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Product Reviews
T
Verified Purchase
Taylor 🤍
Pawtucket, US
★★★★★ 5
Husbands things
My husband bought this. I don’t know much about it but he has zero complaints. He bought it for a boat. He has fixed up 2 boats, sold one & we kept the other. So he apparently knows what to buy & how to use it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 6, 2025
E
Verified Purchase
Edward W.
Belleville, US
★★★★★ 4
Amazon is easy and fast . No problems the oarts was exactly as described.
liked that everything was in one bag . and could make sure everything was changed .
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 3, 2020
J
Verified Purchase
Justin Yeager
Lake Worth, US
★★★★★ 5
Stay cool
Just what I needed, super fast shipping
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 19, 2025
C
Verified Purchase
Crimson
Whiting, US
★★★★★ 5
Outboard is Cooling
The repair kit arrived on time as scheduled. The kit contained everything needed to replace the Mercury 175 OptiMax impeller. The engine is cooling now and we are back on the water without issue. Easy replacement.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 5, 2023
T
Verified Purchase
Ty B.
Dallas, US
★★★★★ 5
Great receiver
Style: R-S202BL, Configuration: w/o Wire and Plug
Super useful and i got it at a cheap price. Currently using it to flip between channels for my record player and for my pc. Works like a charm.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 31, 2025

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