Poly 318 Spark Plug Coloring

[Mackman]

I remember back when unleaded fuel came out the experts said we wouldn’t be able to read plugs anymore.

 

[R. Shackleford]

When you buy your new plugs take the old one and ask for 2 steps colder. Or,,post your plug number and the guys will give you the right number.

They are Autolite 85

 

[HEMI-ITIS]

They are Autolite 85

https://www.autolite.com/media/wysiwyg/tech_specs/Autolite_Understanding-Heat-Range_.pdf

 

[Geoff 2]

I would NOT go two steps colder on the plugs. This is NOT a race car...

 

[R. Shackleford]

Haha yeah definitely not a race car or even a hotrod really. Just a cruiser with a little extra go. Yesterday when I got home I went out to see about the starting issue. I sat in and hit the key and she fired up like nothing happened.... I did NOTHING but bump the key. Not sure why the no start in the morning and no issue in the evening. Today fired right up so I took her to work. I plan on flushing the motor and radiator and replacing the thermostat tomorrow but today she comes with me. Lookin at the top hose and it's not bad, a little soft but I have a new one to replace it along with the lower. I've seen them routed above the top of the radiator like this before but I've always had it more level. Does it make a difference really? Thoughts....

 

[R. Shackleford]

Is the exhaust flap flappin' ?

The exhaust valve on the pass side manifold? Not sure if it works properly although she's got dual exhaust with no crossover (aside from intake manifold) and both tips have equal pressure and sound so I would assume its opening.

 

[HEMI-ITIS]

I would NOT go two steps colder on the plugs. This is NOT a race car...

Maybe 1 step colder,that plug was hot!

 

[Budnicks]

maybe go with a 'non-extended tip' type plug
that'd take you down in heat range
without going down in #

 

[Geoff 2]

Spark plugs have a working temp range of around 800* F. Anywhere within that range is safe. There is no need to change those plugs.

 

[R. Shackleford]

Think I've found the issue. 160 that never closes doesn't seem to be the way to go with this engine haha. I replaced it with a 180, flushed the everything and blew it out with air. I'm even waiting the recommended cure time with the RTV before fillin back up with coolant. In my youth as long as it was loud and fast (not like that stupid tv show) that's all that mattered. Now it's time to do things the right way so I really appreciate all the advice and support.