Whats the difference??

[mustangmods]

The E7TE-AA vs the E7TE-PA..Are they basically the same head ? Will they interchange?
One more question..Has anyone here had any valve clearance problems with stock pistons when using a b-303 or e-303 cam? What are some good pistons to use?

 

[2002BLGT]

The E7TE-AA vs the E7TE-PA..Are they basically the same head ? Will they interchange?
One more question..Has anyone here had any valve clearance problems with stock pistons when using a b-303 or e-303 cam? What are some good pistons to use?

just make sure they are ported ALOT before they go on the engine , otherwise they are a waste of time .....