Allstar Performance Exhaust Block Off Plates - GM LS-Series Engines 20-OTL-NB-4XL Universal coolers reduce operating temperature

Universal coolers reduce operating temperature of the fluid

Countersunk Washers 1/4" x 3/4"

but all auto racing safety gear is "fire retardant"

standard static flow design

Allstar Performance Exhaust Block Off Plates - GM LS-Series Engines 20-OTL-NB-4XL Universal coolers reduce operating temperatureAluminum block off plates seal exhaust ports during engine storage or repairs. Plates help protect against moisture, dust, and dirt. Specialty items for the Shop, Trailer and Track. The Allstar Performance brand offers thousands of hard to find, specialty items that cover many segments in the performance aftermarket. For over 30 years, customers worldwide have come to rely on the quality, affordable and practical items available from Allstar