Just remember if you seal them all up, it's wise to install a vented valve cover cap. You need to have some form of ventilation on the top end. Otherwise when you run the engine, you're likely to get condensation build up under the valve cover from trapped air/moisture. Which of course leads to rust formation under the valve cover and on your valve train components. frown


~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)