Spark plug for EFI

[__Larsson____]

Sp next season im going to install Hyperspark on my 383 with Sniper 650, i asked in the Holley EFI forum if the Autolite 85 was good enough and got the answer that i should go for Idrium plugs, NGK 6341 or Autolite XP3924, they have different pre set gap than 0,035" what i also saw is that it seems to be that the plugs reach further in to the chamber than the Autolite 85 does. Is this okey? What tools do i need to adjust the gap on the plugs?

 

[gkent]

A standard gap tool is all that's needed. They are accurately pregapped though. I put these in my 526 stroker with Terminator EFI. No issues. Indy EZ heads if it matters.

Denso Iridium SK20R11 (3297)

 

[R/T Boy 67]

If your heads are chrysler iron heads then you need short reach plugs.

 

[__Larsson____]

If your heads are chrysler iron heads then you need short reach plugs.

Thank u for that!

 

[RemCharger]

Iridiums and platinums are good for new cars you don't want to touch for 100,000 mi(160,000km)
A good Ole ngk XR5 is all you need. Pre gapped at .035

 

[__Larsson____]

Iridiums and platinums are good for new cars you don't want to touch for 100,000 mi(160,000km)
A good Ole ngk XR5 is all you need. Pre gapped at .035

In that case i could keep my Autolite 85 then. Do you drive EFI?

 

[RemCharger]

In that case i could keep my Autolite 85 then. Do you drive EFI?

No, but that makes no difference.

 

[RJRENTON]

If your heads are chrysler iron heads then you need short reach plugs.

The NGK plugs shown are 3/4" reach and the AUTOLITE plugs are 3/8" reach. The HYPERSPARK system may allow for a slightly gep setting, say 0.040" . NEVER PUT 3/4" reach plugs in iron heads designed for 3/8" reach plugs or you will contact the piston. Just my opinion.....
BOB RENTON

 

[__Larsson____]

The NGK plugs shown are 3/4" reach and the AUTOLITE plugs are 3/8" reach. The HYPERSPARK system may allow for a slightly gep setting, say 0.040" . NEVER PUT 3/4" reach plugs in iron heads designed for 3/8" reach plugs or you will contact the piston. Just my opinion.....
BOB RENTON

Yeah thats what i was thinking. Would you still go for lets say AL 85?

 

[RJRENTON]

Yeah thats what i was thinking. Would you still go for lets say AL 85?

Try AUTOLITE AP-85.....3/8" reach, platinum tip, projected core/insulator, medium heat range, 0.035" cap. Now, the NGK boys will come out of the woodwork, saying Autolites are no good.....you decide......just a thought....
BOB RENTON

 

[RemCharger]

Autolites are ok you could even go with champions if that's what's available

 

[__Larsson____]

Will this be okey? More Information for NGK 7355

 

[RJRENTON]

Will this be okey? More Information for NGK 7355

Probably be ok....if the heat range is compatible AND you do not mind paying ~ $ 6.00 - $ 8.00 more per plug for the exotic metallurgy than the AUTOLITE AP-85......the choice is yours......it's not likely the engine will know the difference (or care).....just my opinion.....
BOB RENTON

 

[__Larsson____]

Probably be ok....if the heat range is compatible AND you do not mind paying ~ $ 6.00 - $ 8.00 more per plug for the exotic metallurgy than the AUTOLITE AP-85......the choice is yours......it's not likely the engine will know the difference (or care).....just my opinion.....
BOB RENTON

I missed you suggestion about that one, thanks! Heat range is a 5 on the NGK is that good?

 

[Geoff 2]

Yes!

 

[furious70]

I've run efi since 2009 with regular plugs, you don't need to have iridium or platinum.
Yes, I do use the appropriate heat range ngk when it was NA and now that it's boosted

 

[__Larsson____]

I've run efi since 2009 with regular plugs, you don't need to have iridium or platinum.
Yes, I do use the appropriate heat range ngk when it was NA and now that it's boosted

But do you have Hyperspark?

 

[RJRENTON]

But do you have Hyperspark?

NO.....I see no need for it.....in my RS23V0A****** '70 GTX, I use a Prestolite Dual point distributor. The engine can go to 6500 RPM without missing a beat, starts and idles smoothly at 1200 RPM because of the cam. BTW... I use either Champion HO-8A or UJ-11G spark plugs, which are NON PROJECTED CORE/INSULATOR design....much to the chagrin of the NGK boys.....and the world did not come to an end......Just my opinion......
BOB RENTON

 

[furious70]

I have a lean burn dizzy that triggers an msd 6a

 

[RJRENTON]

I have a lean burn dizzy that triggers an msd 6a

Not exactly sure what a "dizzy" is?? The original Lean Burn distributor had two reluctor pick up coils....which one are you using to trigger the MSD ECU??.....just curious....???
BOB RENTON