Best spark plug inserts - 2013.

[D7]

Have 3 out of 4 spark plug threads on my heads which have not blown out but probably could have some problems down the track.As I have the heads off now just wondering what the latest product works the best? I believe Time Cert and Big Sert are good but is there anything new on the market now that's even better.

[D7]

After reading about everything available on the net I have decided the only way o go is with Time-Cert.
14 x 1.25mm (14mm Spark Plugs), Standard Repair, 4412.

You folks in the good ole USA are sure lucky you can rent this tool from Aircooled Net.

An important point - John at Aircooled advises using the copper inserts. The part I like best about this product is that they supposedly are better than the original head threads.

[D7]

I presume I would need "washer seat" style rather than "taper seat". inserts.And probably 1/2 Inch long.
Anyone know for sure?

[sideshow]

Aluminum heads use straight holes, you find the tapered seats on cast iron

[D7]

Thanks Sideshow.