Is this okay to use on engine block and head ?

No it is a silicon based sealant great for water pump/inlet manifold/rocker cover/ etc but not any parts continuously immersed in petrol or cylinder heads. (On many modern engines the cylinder head gasket is a "compound" gasket using several different materials, it is a precision part and no one "cure all" will be adaquate)

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HI-TEMP BLACK RTV

Product ID: 508818047

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Details

Brand
Plextone
Material
Silicone
Shape
Round
UPC
711866781650
Manufacturer
Plextone

🔥Heat resistant -80ºF to 600ºF

⚙️Versatile gasket applications

🛠️Flexible & strong bonding

Description

🔥 Seal the deal with power and precision!

PRECISION APPLICATION - Easy-to-use sealant glue that fills gaps flawlessly, preventing leaks and boosting performance.
DURABLE FLEXIBLE FORMULA - Maintains a strong, flexible bond that resists vibration and wear, extending engine life.
TRUSTED PROFESSIONAL GRADE - Plextone’s J-P66 model is engineered for mechanics and DIY pros who demand reliability.
EXTREME TEMPERATURE ENDURANCE - Withstands brutal heat from -80ºF to 600ºF, ensuring your engine stays sealed under pressure.
UNIVERSAL ENGINE COMPATIBILITY - Perfect for sealing everything from valve covers to exhaust manifolds—one sealant to rule them all.

Plextone’s Black RTV Silicone Engine Repair Sealant is a high-performance gasket maker designed to withstand extreme temperatures from -80ºF to 600ºF. Its flexible, durable formula bonds securely to a wide range of engine components, making it ideal for professional-grade repairs and maintenance across multiple gasket applications.

Specifications

Manufacturer	Plextone
Brand	Plextone
Model	J-P66
Product Dimensions	15 x 4 x 4 cm; 110 g
Item model number	J-P66
Manufacturer part number	J-P66
Item Weight	110 g

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