Guys,

I'm a little confused here. I was running FR3LS AC Delco plugs. Wanted to try Champions.

The FR3LS cross references to a Champion RC12YC in the Champion spark plug catalog.

Trick flow recommends the FR3LS in the AC-Delco and the Champion RC9YC. According to the Champion cross reference chart, the RC9YC is about 3 heat ranges cooler than the AC Delco FR3LS!

Should I go with the Champion cross reference and run the RC12YC, or go with the Trick Flow recommended RC9YC?

This is going into a Trick Flow equipped 327. What Champions are you guys running with Trick Flow heads?

Mike



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BDE 327:
Bored .030", balanced, TRW 9.35:1 pistons, Crane Energizer cam .454" 216 @ .050", Trick Flow heads, Edelbrock Performer, Quadrajet.

Mike, FR3LS cannot be found in my area anymore, so I have been using NGK's # FR5. Been working real good. Dave

Thanks Dave!

Going with the RC9YC. Figure the worst that could happen is they foul and I have to change them sooner. Better than starting out too hot.

Mike

I'll second daves response, i found the FR5's alot nicer than the RC9YC's....

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Bryan
-66 300 deluxe
-355, 10.6:1, 250/256 @.050, .565/.575 lift, tfs heads, Super Victor intake, 825 Demon, ATI converter, 'glide, moser 12 bolt w/4.88's, and 200 juicin' ponies! :)
-87 K20 350 tbi, 3"body lift, 4" suspension, and 38" meats
-"big blocks are for babies" ;)

<BLOCKQUOTE>quote:</font><HR>Originally posted by OrangeJuiced:
I'll second daves response, i found the FR5's alot nicer than the RC9YC's....

<HR></BLOCKQUOTE>

Bryan,

In what way were the FR5's nicer?

Thanks!

Mike



------------------
BDE 327:
Bored .030", balanced, TRW 9.35:1 pistons, Crane Energizer cam .454" 216 @ .050", Trick Flow heads, Edelbrock Performer, Quadrajet.

i noticed that the FR5's didnt foul as easily as the champions, and the motor immediately ran better when the NGKs went in. Granted, this was during break-in so carb tuning was constantly changing with both plugs so im sure that had alot to do with it, but my combo seems to like the NGKs better...hope i helped a little anyway http://www.chevelles.com/forum/smile.gif

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Bryan
-66 300 deluxe
-355, 10.6:1, 250/256 @.050, .565/.575 lift, tfs heads, Super Victor intake, 825 Demon, ATI converter, 'glide, moser 12 bolt w/4.88's, and 200 juicin' ponies! :)
-87 K20 350 tbi, 3"body lift, 4" suspension, and 38" meats
-"big blocks are for babies" ;)

Almost ashamed to admit it but, since the store was out of AC's I went to NGK's. Car never ran so good. Starts easier, idles smoother, no midrange lag. I'm sold, NGK's from now on. I've always been one of those, AC's in a GM, Autolite in a Ford, Champion in a Chrysler kinda guys, not anymore. Oh, and they were half the price.... go figure http://www.chevelles.com/forum/smile.gif

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Dave Bradley
www.corvetteforum.net/classics/d1_bradley (http://www.temp.corvetteforum.net/classics/d1_bradley)
'69 SS396 ragtop
'33 3W Coupe
'65 Vette BB Roadster

<BLOCKQUOTE>quote:</font><HR>Originally posted by OrangeJuiced:
i noticed that the FR5's didnt foul as easily as the champions, and the motor immediately ran better when the NGKs went in. Granted, this was during break-in so carb tuning was constantly changing with both plugs so im sure that had alot to do with it, but my combo seems to like the NGKs better...hope i helped a little anyway http://www.chevelles.com/forum/smile.gif

<HR></BLOCKQUOTE>

Bryan,
Thanks for the info. Yes, it did help.

Mike