what spark plugs should i get?
Reply #37 –
NGK's may be great in the 2.3's, but I've tried them in both SO and HO 5.0's and strongly dislike them...I run autolite 25's in HO applications and they are the best I've tried yet...In the summer months (above 60*), you can run autolite AR133's and you'll feel a seat of the pants difference in an HO....not to mention you can order them from Advance Auto for like $21 for a set of 8. There is a reason my old 'Bird ran 14.30's with a stone stock HO, speed density ECU, and an AOD into a 20+ mph headwind. My trap speed on those runs were showing that I had the power to run faster too.
For the track, I wouldn't run anything other than AR133's or modified Autolite 24's. Some guys have claimed 20hp improvements on an engine dyno with the AR133's, I can't vouch for the accuracy of that, but you can definitely feel it.