</font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Originally posted by DerekM:
<strong>I think I'm having a bit of the same problem, except my engine is a completely rebuilt 20r using engnbldr parts and the new RV cam. It started out as what I thought was purely valvetrain noise, but I've slowly got myself convinced that the valvetrain noise is not excessive. I've got an exhaust leak to fix tonight, I'm hoping it is part of what I'm hearing, but I don't think so. My timing is adjusted to ~2.5*btdc down from 5*bdtc, retarding it helped a little. I'll be interested in what you find

out.</strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">>>>*Like I mentioned today, my sevice manual shows the timing spec for your 20R engine to be zero degrees at idle.
*But note one common situation that happens with engine builders, especially new ones...
Often they will hear "noises", when the noise one hears is normal. If you are sure the noise is pinging, try the steps I outlined for you earlier..
Set the timing, follow the steps I suggested, and have faith in your own talents and ability.
I have faith in you, you asked all the right questions.
So I am betting your basic engine is not only fine, but exceptional, since I happen to know you checked everything!
Let me know if you have any more questions or concerns....*EB