With the surge of vendors wanting to make big bucks selling custom heads it is hard to know what you will get and what problems will occur.

In this case 2 C5 owners buy custom heads, CAM, headers, etc and once they have been installed we notice both engines suffer with high oil loss.

In the end the problem is found that bottom of heads milled ground off the ends of metal now exposing the threaded holes for the rocker bolts.
With that end now open the oil runs down the bolts, seeps through the threads and into the cylinders.

Here is what both C5 owners found with these TSP custom heads :-(



From underside :

Will applying teflon paste to the rocker arm bolts prevent oil from entering the cylinders?

Yes, for how long I do not know but in any case I would not be happy with those exposed holes and what effect it would have nor over time if those holes got bigger due to the high temps.

I seem to remember someone had something better than teflon paste , anyone remember what it was?

Mark

Anyone? JR?

Mark I do not know of other types but I would think the tape version is better then a paste which might not do full coverage or dry correctly.

There are other brands that use teflon and function over a wider heat range and pressures such as :

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