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Discussion Starter · #1 ·
So I got a set of autolite iridium spark plugs because for the price they looked great. Well the ones for my sled say they are to replace br8's but my sled runs br9's. It's the correct spark plug from their site but i'm just worried about running them. My question is is 9 hotter than an 8, and would it hurt to run that one size difference?
 

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i usualy run 9s in my sled but i used a set of those same autolites and they ran fine
 

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Why not just run NGK Iridiums so you know you're running the right plug? I don't think there is that big of a difference in prices...

I've ran iridium plugs in the past. Some people claim they make the sled run better...or increase throttle response...whatever. I saw no benefit in running them aside from weight loss, due to a lighter wallet.
 

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Discussion Starter · #4 ·
Well I got them for free, basically I'm trying them out because if they are a decent plug I'm more than game to get some for my next sled. I'm running br9eya's right now, just trying new things.
 
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