Plugs - NGK or Autolite?

Tom_5.0

New Member
Jun 6, 2019
9
0
1
UK
#1
Morning all,

I am currently running NGK FR5 plugs but they don't run good at all. I want to put some Autolites in but what does everyone recommend?
AP104, Resistor 25, AP25 Platinum or APP104??

I have Holley Systemax heads and intake

Thanks,
 
#2
I have always stuck with good old copper Autolites. I haven't seen any reason to put in iridium or platinum plugs in.
 
Reactions: 1 user
#5
Thanks guys. I am in the UK so limited to what we can get here. Looks like a choice between Autolite 25 is the only copper plug available to me so i'll give those a go!
 
#9
Try and explain what the plugs don't run right at all means.
Minor changes such as spark plugs usually don't cause major issues.
 
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