Those long load spreaders lower down on that page were original equipment on Corvair engines, but they certainly help slow down the leaks from the cheap repop chrome valve covers for a stovebolt engine!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!