Quote:

The number on the gasket itself is 8553PT with a R12 under it.





8553PT is the standard Fel-Pro head gasket, which works
fine with iron head/iron block combinations.

1008 is designed for aluminum heads and more expensive.

No gasket will seal if either the the block or heads are
not machined flat. Studs will help.

BTW,

8553_________12.14 cc volume-.054" thick
1008_________8.77 cc volume-.039" thick