Just pulled the plugs on my 4.8 was going to reuse them. But I'll spend a couple bucks and buy new since I don't know the true mileage of them. What type of plugs are you guys running on a carbed application? Its a stock engine don't need nothing to fancy. Also looking into getting a new street demon carb for this. Is this a good carb? I have a 1406 eddy but I'm not too happy with it. I rebuild it, Seems like it had its day. Thought the demon carb would be a good candidate for a 4.8 Any thoughts on what you guys think would be great.

 

Everytime ive owned a demon they are always rich, for a good out of the box carb i like the holley douple pumper 750 mech secondaries. You can tune a demon in and they are as good as any carb but outta the box i vote holley or quick fuel

 

You are 100% right about the demons. Everyone I ever fooled with was rich out of the box. I say Holley. You can get parts anywhere for them if your stuck beside the road.

 

My stock 4.8 has TR6 plugs. Holley 750 vacuum sec carb. Runs great but going to try my new to me 650 mech soon.

 

I had a talk with a Demon Tech a while back when I was looking to buy one.
He told me Demons are wet flow rated Vs. Holley being dry flow rated and this is where a lot of people get into trouble.
I was also told that a 750 Mighty Demon would flow in the low 900's on a Holley bench.

Any mass produced carb will need a little fine tunning out of the box.