5.5 high compression head

[Dkrahn]

With the standard head on my '29 pickup I had autolite 3076 spark plugs. Should I move to different plugs with HC head?

 

[Flathead]

I use stock A plugs on my 5.5 with no problems.

 

[Jim Brierley]

Yes, stock. You may want to not run as much spark advance.

 

[Dick M]

I have very good results with Champion W16Y plugs in my 5.5.

 

[Bruce of MN]

I limit the advamce travel with this.

 

[goldie]

Has anyone used a Champion W89D plug? A local "A expert" said to use this plug, used by hill-climb racers? It is a much longer electrode plug for industrial applications, not Model A. I have put about 2000 miles on them so far so good.

 

[The Master Cylinder]

Has anyone used a Champion W89D plug? A local "A expert" said to use this plug, used by hill-climb racers? It is a much longer electrode plug for industrial applications, not Model A. I have put about 2000 miles on them so far so good.

By the length of porcelain on that plug I would think it would be pretty hot. How does it read?

 

[goldie]

The plug color looks normal to me, runs fine with Snyder high compression head