turby Posted June 9, 2007 Report Share Posted June 9, 2007 I have a brand new set of #8's sitting here. Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted June 9, 2007 Report Share Posted June 9, 2007 I believe it is just the heat range... But AC Delco or NGK... But I perfer AC Delco. BTW, go to napa for the 8's and they can order them for you and have them there within 2 days. I have 54 of those plugs here! and I think Ill try em out when I need plugs again. BTW, for AC Delco rapid fire's you can get #'s 2-4-6-8-10-12-14. 2 being coldest plug and 14 being the hottest. Quote Link to comment Share on other sites More sharing options...
RedGTP Posted June 9, 2007 Author Report Share Posted June 9, 2007 Thanks IRONDOG442 wife.. I'm sorry if my english is not well...but I tried to communicate with another people, at quebec city .. I am the only one to have a GTP with mods... no speedshop find peices for my car .... it's the reason why I come here to requet information ... I just buy a Ac-Delco plug with R42LTSM p/n and I still my MSD 8.5mm and .... that's it ! thank you all Yann Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted June 9, 2007 Report Share Posted June 9, 2007 For GM vehicles, AC Delco and NGK are good. Bosch is bad. Agreed. I use NGK Iridium IX spark plugs, and they made a nice difference. Engine just seemed to run smoother. Just remember if you buy the Iridium spark plugs, don't do any gaping, since they're preset for the right gap size (plus you'll risk breaking the brittle tip). If you still wanna use an ACDELCO plug, I've heard that's just about the best you can go with for your car. Quote Link to comment Share on other sites More sharing options...
ManicMechanic Posted June 11, 2007 Report Share Posted June 11, 2007 With my name being Beausoleil, I should speak French fluently.....lol But I know little of the language...I really want to learn though. Quote Link to comment Share on other sites More sharing options...
Grand Moff Joseph Posted June 11, 2007 Report Share Posted June 11, 2007 Not to add more confusion to the mix, but I've had very good luck with Autolite double platinums... But, if cost is an issue, go with the AC Delcos. Quote Link to comment Share on other sites More sharing options...
digitaloutsider Posted June 12, 2007 Report Share Posted June 12, 2007 If for whatever reason you go platinum in the 3.4 (read: don't), just stay the fuck away from anything Bosch. Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted June 12, 2007 Report Share Posted June 12, 2007 Can anyone comment on the performance and quality of the NGK Iridium series spark plugs? I've been using them for a while and I love them. Has anyone else tried them? Quote Link to comment Share on other sites More sharing options...
Andrew Posted June 12, 2007 Report Share Posted June 12, 2007 With my name being Beausoleil, I should speak French fluently really? i went to HS with a chick with the same last name. Beausoleil = beautiful sun IIRC. Quote Link to comment Share on other sites More sharing options...
slick Posted June 12, 2007 Report Share Posted June 12, 2007 Can anyone comment on the performance and quality of the NGK Iridium series spark plugs? I've been using them for a while and I love them. Has anyone else tried them? On these engines, your not going to get any gain of out upgrading any part of your ignition system. The power you feel is the power you lost from your old, worn out plugs. Quote Link to comment Share on other sites More sharing options...
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