What do you think is happenning...

[Donnie Yukonie]

Ima subscriber this should be interesting

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[99Yuk]

Ok. I took pics of the spark plugs...

Original's I put in the crate motor some 90k kms (56k miles) ago with no MSD IGN componants. All stock OEM IGN. Just a few engine mods...
These are AC-Delco 41-993's.

Upgraded to a heat range colder. Used them for less than 5k kms (3k miles) These are AC-Delco R42TS's. They were supposed to work better with an all MSD IGN. They are from the 4.3l vortec.
I didn't like them.

Now I'm back on a new set of 41-993's with the all MSD IGN. And I'm happy. I'll pull them out again at 16k kms(10k miles) and take pics. I'm at 270k kms (167k miles) on the body now...

Then we wait for Sunlitcomet to get to 10k...
I imagine that may take a while though... I know.. I know... Just Kidding!!!!!!

 

[SunlitComet]

No doubt it probably will until I get work again.

 

[Donnie Yukonie]

good pics two on the left dont look to healthy what cyl numbers were they?

 

[steamroller]

I didn't like them.

Probably because those are the wrong reach plugs for a Vortec. Look at the difference in thread length. Should've used R42LTS6 if you wanted a colder copper core plug, or R43LTS6 for the factory heat range.

 

[99Yuk]

Probably because those are the wrong reach plugs for a Vortec. Look at the difference in thread length. Should've used R42LTS6 if you wanted a colder copper core plug, or R43LTS6 for the factory heat range.

HAHAHA!!!!! Dope!!! I feel like such a dumb a$$.....

You know...now that you mention it, I noticed that they stuck out more than the 41-993's but I didn't think anything of it.

Plugs are cheap... I think I'll try the R42LTS6 next.


EDIT: I just plugged that part# into summit racing and it doesn't even cross reference to a GM product. Well a Cadilac motor....How/where can I verify that part#? Thanks!

---------- Post added at 05:07 PM ---------- Previous post was at 05:02 PM ----------

good pics two on the left dont look to healthy what cyl numbers were they?

Sorry, IDK. I didn't keep track of which one came from which cyl...

 

[SunlitComet]

R42LTS6 fits.


Compatibility Chart

Make Model Year Engine Notes CadillacAll1982-19834.1L V8.060" GAPCadillacDeVille1982, 19834.1L V8.060 GAPCadillacEldorado1982, 19834.1L V8.060 GAPCadillacFleetwood1982, 19834.1L V8.060 GAPCadillacSeville1982, 19834.1L V8.060 GAPFordAll20053.9L V6.054 GAPFordFreestar20043.9L V6.054 - GAPFordFreestar2004, 2005, 2006, 20074.2L V6.054 GAPIsuzuAll1997-19994.3L V6.060 - GAPIsuzuAll20004.3L V6.060 - GAPJaguarAll20022.5L V6
JaguarAll2000-20023.0L V6
MercuryAll20024.0L V6 FLEX.054 - GAPMercuryAll20044.0L V6 FLEX.054 - GAP - BASE MODELMercuryAll20024.0L V6 GAS.054 - GAPMercuryAll20044.0L V6 GAS.054 GAP - BASE MODELMercuryAll20034.0L V6.054 - GAPMercuryAll2004-20074.2L V6.054 - GAP

 

[99Yuk]

I must be blind as a bat.. I didn't see 5.7l or 350 anywhere in that listing....
Please spell it out for me.. thanks.


EDIT: oh .. I see it. 4.3l thanks....
EDIT2: Ok so tomorrow, I'll order some up! Lets try out another batch!

 

[SunlitComet]

they don't fit a 5.7L only v6's
I was trying to point out they don't fit.
You had wanted parts verify right?

---------- Post added at 04:04 PM ---------- Previous post was at 03:32 PM ----------

I also should mention that 605's are not colder the 104 are so I may change them at autozone. I am still debating the the colder plug theory.

 

[steamroller]

R= resistor
43= heat range
L= long
TS= tapered seat
6= gap (.060)

14mm thread, .708 reach, 5/8 hex for BOTH plugs. Exactly the same as the 41-993 (imagine that )

The R42LTS6 fit IF you want a colder heat range plug in a copper core.

I don't need Amazon or RockAuto's ''what it fits'' page the specs are out there. Just like the guys at the parts stores, they gotta have a year,make, and model or they can't tell you anything.

 

[SunlitComet]

Worst case with colder is they foul up but hopefully may get a $200 High octane BBtune in November. Then colder would be more appropriate.

 

[99Yuk]

R= resistor
43= heat range
L= long
TS= tapered seat
6= gap (.060)

14mm thread, .708 reach, 5/8 hex for BOTH plugs. Exactly the same as the 41-993 (imagine that )

The R42LTS6 fit IF you want a colder heat range plug in a copper core.

I don't need Amazon or RockAuto's ''what it fits'' page the specs are out there. Just like the guys at the parts stores, they gotta have a year,make, and model or they can't tell you anything.

That is exactly what I"m after.
And now I'm going to order them up tomorrow! Thanks again.

---------- Post added at 08:13 PM ---------- Previous post was at 08:07 PM ----------

Worst case with colder is they foul up but hopefully may get a $200 High octane BBtune in November. Then colder would be more appropriate.

Ahh, that's the thing.
Allegedly if your making 75-100hp over stock, then you want to drop a heat range to prevent premature detonation which is enough to not cause fouling.
That's what I"ve been reading anyways.

Why/How does the octane level affect the heat range? I didn't read that anywhere?

 

[SunlitComet]

Why/How does the octane level affect the heat range? I didn't read that anywhere?

No just trying to prepare for the whole plug may be to hot thing.not likely to see 75hp more soon but will follow MSD recomendation about colder plug.

 

[SunlitComet]

Well still in to hand much pain to do engine but did manage to get this stuff from the big brown truck lately.

 

[SunlitComet]

More:

 

[SunlitComet]

Oh and Autolite 105 plugs. One step colder and copper core.

 

[WiCK3D_SiX]

Looking good, I wanna see this thing finished though!

 

[SunlitComet]

The oil primer tool from autozone does not fit Vortec 350 oil pumps. The slot in the Vortec 350 pump appears slightly thinner then others.

DAMN!

 

[78mc-bbc]

Good luck with the Tahoe, i'm still waiting to here from my mechanic on mine, either fuel pump or injectors, the mechanic and i are both leaning towards the pump

 

[BattelWagun]

Can't wait to see it finished! Let us know what a difference the new system makes

oh and why not just get a whole new dizzy while you're at it? It's probably some vortec compatibility issue isn't it?