Stroker Plugs

With aftermarket heads you need to confirm the spark plug size and reach. Check the Trick Flow instructions for what they say. I assume those heads need a 14mm thread with a flat gasket and a 3/4 inch reach but you need to confirm before you buy anything. If those are the correct specs then I'd go with something like a NGK 6987 which is an OEM plug so it is fairly inexpensive. It has an extra projected tip and a wide gap and a 5/8 hex. They are usually less than $3 each at Summit. It is a plug that Chrysler used in a bunch of cars as well as some other mfgs. I use the 6987 on most performance engines that take a 3/4 reach gasketed plug.