letz talk spark plugs

[RootBreaker]

Ok so I have ALWAYS used bosch platinums in my truck... since 1989 (or when they came out cant remember that far back)

anyhow.. I did my cam, vortec heads, vortec intake upgrade and my truck has a miss.... yeah I re-used the plugs and wires... only 14 months old and not a daily driver

anyway... I figured let me try new plugs first... a friend of mine asked me what was I putting in and I said... bosch platinums.. he said AC Delco is the only way to go in a older GM.. run the best and out perform them all.. and are cheaper too...

Well the cheaper part I like as I just got done dropping $700+ into my motor.. hence why i reused the plugs and wires..... cap and rotor....


so
what would you use?
I need to get this miss to go away.. even running on 7 cylinders truck has grown some gonads.. truck hit puberty...

 

[ankarback]

Im always used AC-delcos. They are cheap and works.

 

[dyeager535]

If you went from pre-Vortec heads to your Vortecs, and used the same plugs or same style, that's your problem right there.

 

[REDCRO_REDNECK]

for the junk I run, ac delco "rapid fire" work the best. they cost about 40 a set but can take the occasional flood out.

 

[Boondocks]

Since I added the MSD 6AL, I change to Denso Iridium plugs.
My thought was that they would hold up longer, with all of the extra low RPM sparking.

Time will tell. But they do run good.

 

[83ZZ502_Jimmy]

Stock Delco's and a new set of MSD wires. A new cap and rotor wouldn't hurt either.

John

 

[Hogback Fabrication]

If you went from pre-Vortec heads to your Vortecs, and used the same plugs or same style, that's your problem right there.

Yep, square on the head. Vortec spark plugs have to be longer to reach the middle of the combustion chamber. Get the correct AC Delco plugs and you will be fine.

 

[RootBreaker]

Yep, square on the head. Vortec spark plugs have to be longer to reach the middle of the combustion chamber. Get the correct AC Delco plugs and you will be fine.

hmmm my father said if you put a 1991 motor in a 1978 you need to get a cap, rotor, plugs and wires for the 1978... however with 1996 tahoe heads... I should get ac delco's for a 1996 tahoe?

 

[Hogback Fabrication]

Yep.

 

[83ZZ502_Jimmy]

hmmm my father said if you put a 1991 motor in a 1978 you need to get a cap, rotor, plugs and wires for the 1978... however with 1996 tahoe heads... I should get ac delco's for a 1996 tahoe?

Yes!

 

[dyeager535]

Buy the Vortec plugs, then hold one up next to one you pull out. Then duplicate this smiley:

'tis OK, got a great deal on 16 spark plugs for my new motor...then figured the same thing out.

You'd need the older cap/rotor because the '91 would have been small cap HEI. Wires aren't different, they are so generic nowadays (if talking parts store sets) that all come with a coil wire, to fit just about any Chevy ever made.

 

[RootBreaker]

thanks guys.. ill get the hoe heads.... and doubt I will get them in today but never know..... most likely tomorrow night.. wife has school so I get a few min of time.....

 

[RootBreaker]

also side note.. maybe that is why it idles kinda ok.. but when you lay into it it still runs ok.. but hammer it down and good for a bit then spit sputter spunk!!!!

 

[RootBreaker]

replaced plugs... the 1996ers were 50" longer (more threads) but a tad shorter... however once I got them in and fired the truck up.... my timing was WAAAAY off!!!!!

seems to be good now.. will hopefully get out this weekend to test it out...

 

[dyeager535]

Probably helps that you are getting spark in the chamber. I can imagine that will affect timing just a hair lol.