The heat transfer is a valid consideration except no type of insert will ever transfer heat the same way as the original unmolested spark plug threads in the head material. There will always be an insulating effect from the very thin air gap between female threads in the basemetal and the male threads of the repair insert. If thermal transfer is a significant concern for whatever reason, you will need to get a new head. For most folks the cheaper heliciol sparkplug repair kit will be more than adequate, and it won't exactly be cheap either.

 

Weathers getting nice. Should be 102 by tuesday. SLO is a nice 75 deg.

 

I'm with Holepuncher on this one but would remove the head. Just don't see any way to keep 100% of the debris out of the combustion chamber doing it in place. Having said that, add $100 to the cost of the Timesert kit and buy a set of '06 or later take offs, replace both heads and use .030" head gaskets for a little performance boost.

Then, see about repairing the old heads by retapping or helicoil and put them on Ebay, even if you only get $75 for them; you're ahead.

 

The Time-sert, with exponential interaction and continuous mass, is coupled to different heat zones along it's entire mass, whereas the non-integrability of the Heli-coil system leads to a quasi-ergodic behaviour. It is shown numerically that a stationary linear temperature gradient is supported by the Time-sert. The conductivity coefficient kappa depends on the mass ratio and the temperature of the surrounding media. The theoretical values for Time-sert vs. Heli-coils compare reasonably well with experimental results in Al and Mg alloys.

 

Yep last week we had a ford triton 5.4 in my shop blow a plug out and we pulled the head and heli coiled it. Wish I knew about this tool. Wouldnt have had to pull the head!

 

Jus' messin' wit chu, dog.

 

Get the back tire off the ground, in gear, hand roll the tire untill you can get the intake or exhaust valve opened for the cylinder being repaired, stuff an air hose in the tail pipe or throttle body(which ever valve is open), stuff a rag around it and tape it in place. open the air valve and keep it open at low pressure while performing the tapping operation, the air will keep all of the chips blowing out of the hole, no worry of rouge chips getting in the cylinder and damaging the wall or rings.

 

Piston top dead, and a quality medical gauze pad coated in grease.

 

what he said....been there, done that ...many times....helicoils are cheap easy and dependable...and if they do come out you can just put another back in...although I have never seen one come...I go with what I know in cases like this ...and helicoils work...

 

I think I am going to give the heli coil a shot and if that fails I will replace the heads
Thanks I do appreciate all the information here.