[shockers69]

I have a mild pump gas 406 with Sportsman cast iron straight plug heads.I use a 150HP shot of nitrous and i also have a MSD timing retard box.I have Autolite #25 spark plugs in the heads now.Are these correct?

 

[pdq67]

There's two type's that I know of so if I'm all wet, somebody, please jump in and tell me!!

Flat end plugs w/ the steel crushable metal gasket and taper seal w/ no gasket so go from there.

Heat range's can vary all over the place so I won't get into that. Much less extended reach and resister types too.........

And fwiw, I always thought Ford Autolite's did me fine, so go figure!!!!!!!!

I will say that if you check out a B&S or Lawnboy lawnmower sparkplug at Walmarts and cut your ground electrode off the same, it will increase spark "density" for lack of a better word which create's a better spark "ball"!

But doing so will shorten your plug's life.

pdq67

 

[onovakind67]

I use Autolite 25's in my SPII heads, but they might be a little hot for nitrous applications.

 

[Old Man]

There's two type's that I know of so if I'm all wet, somebody, please jump in and tell me!!

Flat end plugs w/ the steel crushable metal gasket and taper seal w/ no gasket so go from there.

Heat range's can vary all over the place so I won't get into that. Much less extended reach and resister types too.........

And fwiw, I always thought Ford Autolite's did me fine, so go figure!!!!!!!!

I will say that if you check out a B&S or Lawnboy lawnmower sparkplug at Walmarts and cut your ground electrode off the same, it will increase spark "density" for lack of a better word which create's a better spark "ball"!

But doing so will shorten your plug's life.

pdq67

He's asking wether or not he has the correct heat range spark plug for nitrous use which generally would be at least 1 heat range cooler than a performance plug for a 150 shot and below.