So of course I have another issue with my build, this one has to do with spark plugs. I bought a set of plugs for the 440 before I redid the heads or anything, Accel 437S, which are header plugs with a 3/8 reach.

I looked at my heads yesterday and realized that the threads are 3/4 so I need a longer reach, Edelbrock recommends Champion RC12YC or similar plugs. The only issue I think I will have is that they will be too long, if I cross them into Accel they recommend 786, which I believe is another long plug.

Does anyone know of a header plug I can get that has the 14mm thread, 3/4" reach, projected tip, gasket (flat) seat, resistor plug?

I think the Accel 416S plug might work, but the applications it lists are for small engines on Toyotas and other similiar cars.

 

I also found the Accel 414S. The only difference I see is that the heat range for the 414S is cold, and the 416S is stock. Their range is from 1-7 (1 cold, 7 hot) so I should go with the 6?

 

If you didn't see my thread about it, the only stock parts are the block, oil pan, and timing cover.

They don't make a 415s, only 414s or 416s in that series. So the 416s would be the better?

 

Ok, that sounds like a good idea.

I was trying to see what was all available but most of the other manufacturers make it difficult to find plugs.