Hitman's Pontiac Trans Am Forum

Trans Am Information => Trans Am Tech => DriveTrain => Topic started by: Maxthe222 on November 23, 2017, 03:19:34 AM

Title: '79 403 Spark Plug Choice
Post by: Maxthe222 on November 23, 2017, 03:19:34 AM

Hey guys,

Looking to get some new plugs for my Y84, what kind of plugs should I get? I'm considering NGK V-Power Model XR45 Plugs.

Are those ok, or do you guys have any better suggestions? I'm more for reliability over power.


Thanks folks!

Title: Re: '79 403 Spark Plug Choice
Post by: winks79 on November 23, 2017, 06:45:22 AM

I'd stick with the AC Delco's that it came with. Never had any issues with them over the years.

Title: Re: '79 403 Spark Plug Choice
Post by: Wallington on November 23, 2017, 07:04:49 AM

Is she still stock,  Max?

Title: Re: '79 403 Spark Plug Choice
Post by: Maxthe222 on January 25, 2018, 10:53:23 PM

wow really late reply from me but yeah, 100% stock 403, I'll modify my Macho T/A engine, but the Y84 stays as original possible

Title: Re: '79 403 Spark Plug Choice
Post by: Wallington on January 31, 2018, 03:50:11 AM

Stick to stock plugs, can't go wrong with Delco, or equivalents. Regap to about .040" since don't need smog rubbish and reset timing until it's happier, 18-22 ish. R46SZ is original, or R46S where you set your own gaps. Make sure it's the correct type, nearly every Olds heads or engine I've pulled down has had some variation of Chev or Holden plugs in them, simply because the thread matches, but wide variety of electrode positions.

Title: Re: '79 403 Spark Plug Choice
Post by: Burd Turd on February 01, 2018, 05:05:14 PM

The GM perf plugs are awesom, I run them in my 400.  They make like 1,2,3,and 4's. 

Title: Re: '79 403 Spark Plug Choice
Post by: Wallington on February 02, 2018, 01:36:36 AM

Well, he'll need all 8 plugs...jk..what's 1,2,3,and 4?