Royal Purple 5W20 Synthetic Motor Oil Synthetic - 5 Gallons BR20013 tapered seat to 3/8" NPT

tapered seat to 3/8" NPT male

They dimpled their tubes at the port to make more room for the header bolts and they parallel ground their flanges to assure a tight seal

24 in W x 20 in H x 3 in D

1993-1993 Cadillac Allante

Royal Purple 5W20 Synthetic Motor Oil Synthetic - 5 Gallons BR20013 tapered seat to 3/8" NPTProduct Description: Motor Oil 5W20 Synthetic 5 gal Jug Sold Individually Royal Purples premium synthetic motor oil and synthetic lubricants have been designed to improve performance in all conditions and provide cleaner operation, better mileage and decreased oil change frequency. With options available for most automotive, industrial, marine, motorcycle and racing applications, Royal Purple is the obvious choice to maximize performance.