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Old 09-12-2008, 01:32 PM
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Spark plug choice for vortec heads?

I have a 400 small block chevy with KB hypereutectic dish pistons with brand new vortec heads.. what kind of spark plugs could i run in these heads would like ac delco rapid fires work? or what are your guys recommendations?

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Old 09-12-2008, 02:16 PM
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9:1 compression - AC - 45 heat range - I think the plug is a R45TS
9:75-10:1 - AC - 44 heat range - R44TS

I don't know about the rapid fire platinum plugs... I think their heat ranges are a different # system than the regular AC plugs...
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Old 09-12-2008, 04:15 PM
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You can get the R42LTS, wich is the longer reach plug, but a bit cold. Not sure if it comes in a 44 or 45, but the local GM dealership should be able to tell you.
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Old 09-12-2008, 07:00 PM
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does it have to be a 708 reach or could it be a 750 reach?
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Old 09-12-2008, 07:06 PM
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well i just see limited options for the 708 plug and more for the 750
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Old 09-12-2008, 10:03 PM
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well i'm only in high school so give me a little break about the questions..if i knew it all i wouldnt be asking you guys.

i have learned that asking questions will prevent costly mistakes and i'll learn something new and save time so like i said give me a break

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Old 09-13-2008, 12:26 PM
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I'm using a Champion 7013.
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Old 09-13-2008, 01:17 PM
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Quote:
Originally Posted by SBCfan04
well i'm only in high school so give me a little break about the questions..if i knew it all i wouldnt be asking you guys.

i have learned that asking questions will prevent costly mistakes and i'll learn something new and save time so like i said give me a break
Excellent attitude. Glad you asked. Glad to give my opinion.

My personal opinion is that "I wouldn't run a Champion if they were free". Based on my years of experience, and of others I know well.
In the past month I have pulled NEW Champions out of 2 "customer" cars that were brought to me because they wouldn't run right.

Engine engineer/builder David Vizard, who often bylines in PHR, wrote on his web site about Champions being down 100 hp on the dyno from other brand. He didn't actually say it, but its reads like he won't run Champions.
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Old 09-14-2008, 11:49 AM
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Quote:
Originally Posted by F-BIRD'88
In over 35 years

I've never had a faulty or defective Champion spark plug. Or trouble with the performance of these plugs.

With all respect to DV, Could you post the specific link to the page where David Vizard coments on Champion Spark plugs?
Sure will. I thought I saved it but am looking for it to post here.

As far as my circle of friends and Champions....
after you have a couple sets that won't run well right out of the box.......
or break down in a couple thousand street miles.....
We just don't spend the money and effort to mess with them anymore. period.

Switching to another brand of comparable plug solved the problems 100% in every case.

I met one shop owner about 2 months ago who likes Champions and hates Autolite. Last week I was in his shop and he was installing the 3rd set of Champions into a customer's car in less than 3000 miles...... for free.....
........ but he likes em.........go figure

PS, I have also never owned a set of Splitfires that lasted longer than 3000 miles without missing. OH ya, they did make a noticeable difference in power compared to a brand new regular plug... but they won't last. Had 2 sets from random stores in 2 different cities 100 miles apart.
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Old 09-14-2008, 12:28 PM
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Here ya go....
David Vizard's problems with Champion spark plugs solved by installing Autolites.

http://www.gofastnews.com/board/tech...-part-3-a.html

Similar problems that we have discovered in Mopar V8 and Ford V8.
I experienced this 45 years ago and as recently, as noted, the mechanic changing the 3rd set last week.

Last edited by ScoTFrenzel; 09-14-2008 at 12:33 PM.
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Old 09-17-2008, 09:28 PM
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Quote:
Originally Posted by F-BIRD'88

. A fouled plug does not recover once it is fouled.

I will make a note of that for D.
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Old 09-17-2008, 11:17 PM
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The only trouble I remember ever having with Champion plugs was in my old 292 I-6 that would barely run on RN12Y's because the piston domes beat the gaps almost shut. I, too, fixed it with some kind of Autolites with a more retracted gap.
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Old 09-21-2008, 12:21 PM
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I have been watching the other forum:
Here is David Vizard's response to this question:
http://www.gofastnews.com/board/tech...art-3-a-2.html

David Vizard quote/ copy and paste
The only comment I have here is that we started and warmed the engine on regular extended nose plugs and then change out to the race plugs ( I have done this a time or too and it is far from my first rodeo) it was not until we had flooded the engine toward the end of our search for the problem (after flooding no attempt to start the engine was made as I was fully aware that in those days cold running plugs fouled easily and would fail to start) that we changed the plugs. However fouling the plugs was not the issue as our Sun scope showed every cylinder (all 4 of them) was firing. Like I said this was something of an anomaly - I have had nothing happen like it before or since!


For what it is worth we have had virtually 100 % success at cleaning race plugs by dropping them in acetone and stiring them around awhile then blowing them off with a 'dry air' air line. I don't know what the poster on the other site was using but by 1966 we were building electronic ignition systems that would fire some pretty disgusting plugs!

DV
end quote
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Old 09-21-2008, 06:27 PM
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Good, we are in agreement as to where we stand.

All the bad ones I take out after a week or two, I will have the car owners mail them to you.

As for me..... well, I wouldn't use a Champion if they were free.
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Old 09-28-2008, 03:05 PM
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My buddy said he pulled out 2 sets of Champions this week, that other shops installed them less than 3000 miles ago and the cars were missing already, and the owners brought them to him to fix.
Champion out....... AC and Motorcraft IN.......
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