E85 spark plugs

[Trbobuick]

Hey all. What's the current go to street and race spark plug for a Champion headed engine running 28psi?

 

[GNVYUS 1]

NGK TR6 here with Champion GN1 heads, got this tip from Steve D on here. Depending on coils your gap might need to be tightened up.

 

[BEATAV8]

Aluminum heads (Champion / TA) NGK 5430 BCR8ES, Brisk DR12S (NGK8), Brisk DR10S (NGK9)

Iron heads DENSO 5333 ITF24 (NGK8) DENSO 5334 ITF27 (NGK9)