according to what ive seen +6 HP gain and +6 torque gain on a Type I engine, backed up by dyno run. but then again, saw this on ebay, so i dont know...................but they had the actual dyno results i think
Do a search on for Denso Iridiums, and you'll find that I put a post up letting everyone know what Frank was doing a group buy for Denso Iridium Spark Plugs for $9.70 ea! So I ended up paying $58.20 with SHIPPING INCLUDED!
I can't recall the email address exactly so that's why you should do a search.
Gilbert, where can I get in on that Group Buy. I know that I'm gonna need some new spark plugs pretty soon anyways, so it probably wouldn't be a bad idea to try these, especially if they give the 5hp increase like they say.
The Denso Iridiums and NGK Platinums both last 60K miles. I bought my iridiums and the brochure has the lasting as long as the platinums. It's the coppers plugs that last 30K. I haven't really noticed any performance difference, but this price in the GB is too good to pass up since both are normally the same price.