I have swapped a bunch of parts around.. and one head has E1 and one head has E2... only thing i can see is the dowel pins aren't as deep in the head.. so my questions is.. can i run one E2 and one E1? or do i have to keep them the same?? 
YAMMIEGOD3:16
Active member
LIKE RICK POSTED , NO ISSUES. 3:16 (yammie tony)
jwurl
Member
The E1 and E2 are just casting dates. They are the same heads. Jeff Wurl