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Return to Parts List Category : A- Small Block "LA" SFP 9340 273-318/5.2-340 REAR MAIN SEAL KIT PREMIUM FLUOROELASTOMER RUBBER WITH FRICTION REDUCERS $38.00 Fits 340 engines These rear main seals are engineered to provide confidence in sealing a very demanding area of today’s advanced racing engines. Material:   Unique blend of premium Fluoroelastomer rubber with friction reducers provide minimal parasitic losses and withstands intermittent temperatures up to 550º F. (Note: This material is no longer brown, but black) Design:   Special design sealing lip and parting surface area ensures confidence in sealing Dry Sump/High Vacuum as well as advanced wet sump applications. Results:   Top engine builders in many forms of motorsports have realized the ease of use and sealing benefits provided by these products This is the seal to use with Engines using vacuum pumps.