Spark plugs for a vortec/tbi conversion?

[blazup1x]

Can anyone tell me when purchasing spark plugs for my set up do I buy plugs for a 87(stock year) or a for a later truck such as a 96 or so? Thanks.
/forums/images/graemlins/thinking.gif
Chris

 

[84_Chevy_K10]

If you have Vortec heads, buy plugs for Vortec engines.

AC Delco platinum ONLY!!!

 

[blazup1x]

But It's still a 87 stock ignition, would it make a difference? but if I should run platinums guessI should pick up a set. Thanks /forums/images/graemlins/waytogo.gif

 

[dyeager535]

R44LTS.

If you don't run plugs for the Vortec heads, they won't even reach into the chambers.

I'm sure the R44LTS isn't just a Vortec plug, but that is what you need for stock plugs for a Vortec head.

 

[84_Chevy_K10]

R44LTS is a standard plug.

Vortecs call for platinum only.

 

[dyeager535]

I would suspect that has something to do with warranty intervals, no?

Not sure why you'd need a platinum plug with compression ratio available with standard plugs and using the same HEI ignition that used standard plugs forever.

A bit of a challenge, but I'm curious as to why the platinum plugs matter.

You are correct, both AC part numbers appear to be platinum, one for sure is, the other is a rapidfire plug, looks to have a similar or same electrode setup as the platinum.

No problems with mine running on the R44LTS'.

 

[84_Chevy_K10]

R44LTS is not a Rapidfire plug either. Rapidfire plugs generally have single digit part numbers. Platinum or Iridium plugs have numbers such as 41-xxx. I have never seen anything else listed for a newer Chevy pickup so that is what I suggest.

Either way, definitely AC Delco. Nothing else runs right in these engines in my experience.

 

[dyeager535]

Yes, both the plugs you mentioned are listed by AC delco for a 1997 C1500 5.7L. (for instance) If the poster wants the GM recommended part numbers.

I noticed with my headers, that number 5 plug removal/install results in a a broken insulator when you attempt to use a socket on it. Have to go in at a bit of an angle, and obviously that bit of an angle is enough to crack the insulator inside the base of the plug.

Nothing wrong with the plugs, just gotta be careful with them.

 

[grundy99]

[ QUOTE ]
R44LTS is a standard plug.

Vortecs call for platinum only.

[/ QUOTE ]

I have a GM Crate motor with Vortec heads and the book that came with my motor calls for R44LTS plugs.
That is what i run and they work great. If nothing else call the dealer and ask the parts counter what they suggest