4.6L General DiscussionThis section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.
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Hey guys, its time to change my spark plugs, and everybody seems to have a different oppinion as to what brand and what stage to use. What would the blower guys on here recomend? I have heard people mention NGK TR6's at .035' gap, just trying to figure out what the best possible plug to use would be. thanks in advance, by the way, heres my setup at this point:
-298cid forged shortblock with Mahle Pistons 8.5:1 compression
-P&P heads, comp cams blower cams, titanium valves, New valvesprings,
- Stock PI intake
- MSD coil on plugs
-Vortech T-trim at 14lbs of boost
-"interceptor" automatic with wide ratio gear set and 2400RPM stall converter
-Braced drop in 9" rear end with 3.73's
Again, light you guys can shed on what plugs to buy would be great
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vortech says to use oem plugs at oem gap this this true? i just got done putting in 42# injectors and oem spark plugs.
It really depends on your setup and how much pressure your running. If you are under 10psi, the stockers will probably be just fine, but I would still put the gap down to .040 max. One step colder is a good precaution especially for our stock internals. They pretty much won't hadle any detonation. I ran the OEM (non-platunum) when I was at 8psi for 6 months and never had any detonation issues.
But in his case running 14psi he definitely needs colder plugs and smaller gap.
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