And with cast aluminum covers,you don't need to tighten 'em as tight for 'em to seal.
Sounds to me like he didn't use the M/T covers cuz the steel ones weren't leaking,so why invite trouble-just don't ever remove 'em...
Speed


1954 GMC 350
1957 GMC 1/2 ton
1962 Chevy C-30
1952 Chevy 6400 dump bed project truck
'98 Harley FLSTC
'66 Pontiac Catalina
'76 Chevy 1 ton Duallie
'84 Bronco II
'78 Dodge W-200
'81 Toyota 4X4 truck