Have you tried to find an NOS that is still soft and pliable ? Those OE caps got quite hard and didn't seal well after several years of use in DD's either.
__________________
Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
|