I am thinking about changing to the denso plugs after xmas. And am liking to do it myself I am mildly machinical mostly on old 71 chevy tho. Is it really hard or just mostly time consuming? Also if I get some in and run out of time is it bad to drive it with a mix of plugs for a short time (couple of weeks)? Also to the come pre gaped?

 

It's really not that hard. I've done it 3 times, it has never taken longer than 1hr 45min (1st time), to 1hr 15min (3rd time). Gap anywhere between .040-.044 depending on who tells you. There is no need to run a 'mix', it's just not that hard.
Go to Chucks page and he has a very informative how-to. I would add a telescoping magnet to the tool list. It is a must have for the 7mm coil pack bolts. Torque is 15 ft lb I believe, do a search. I've worked mainly on aluminum heads so it was pretty natural to me.
http://home.midsouth.rr.com/lightningpage

 

Also I have heard of guys blowing pugs out how tight with these aluminum heads should one tighten the plugs? Hand tight then a quarter turn is what I have used on all other trucks?

 

I'm in the process of changing mine right now.Took 2hrs just to take the old ones out last nite.{with the proper tools & advice from Chuck's page}Redneck where do you live?I'll fly you in to finish this for me!!J/K.I had 2 electrodes completely burned off and a 3rd with a hole about half way thru the electrode.Puttin in NGK TR's,What do I gap at?Anybody Know?THX!-Daver.

 

I gapped my TR-6s at 40. I think 40 to 44 is the range.

 

What about how tight to put them in finger tight little more than finger? thanks

 

How many miles did you have on the stock plugs? I've got 17,000+ and am getting worried . I did pull no. 1 plug today and it looked ok--kinda 'rusty' looking electrode?

Dan

 

I don't know why everybody is short gapping these plugs. A bigger gap gives better fuel burn and better gas mileage. I gap mine at .44 and I run a bigger lower pulley. Mine runs great. If coil on plug can't fire over a .44 gap you must have a bad coil. In theroy, you want the largest gap that the plug will fire under all conditions, including max boost. I'm putting a 4 lb pulley on Monday and will see if the .44 is a problem with the increased boost.
noelvm

 

My problem was the result of running a 4LB Pulley/Hot chip/Race Gas/Ram Air set-up at the track w/stock plugs.I ordered the NGK TR5's with my mods,but did not get them in time to go to the track,so I made a few runs on the stock plugs.The stockers were fine for my 2LB pulley 4-way chip,but the new mods were too much!Also had some coolant & oil leaking down onto my starter and O2 sensor cat area.And a slight Knock.Drove home 55 miles @ 70MPH with no more problems.Nothing on the garage floor next A.M.All fluid levels are o.k. w/no contamination.I'm hoping changing these plugs is the end of my problems,but i'm a little worried.

 

I fly for free anyway! QUICK TIP - A couple of beers, NOT a six-pack

 

I changed mine to Densos last week, took 1 hour & 20 minutes. Very straight forward. The only tricky part for me was the 3rd plug back on the drivers side, the 7mm coil screw is tough to get to.