i just got done puting on a new set of PRC 2.5, with 918 springs, i had a set of 918 on my stock set of heads and were quite.. now i get the PRC on and i have a tickinnn sound that is like a exhaust leak but there is not one. i have looked every were and and pulled off the valve covers and all is good. when you mash it..it goes away, but comes back when let off and when it goes in to 2nd. it might just be valve train nose? but it sounds like ****! LOL, it runs good and pulls hard but i will take to the dyno on tue. has anyone run into this before????

thanks for the help

 

were the heads milled at all?

 

What size pushrods did you use?

 

 

i used the same ones i uses on my 317 heads.. that has not cross my mind. and i hope that is it. thay are 5.3 heads PRC with 59cc, my 317 were 72cc, and i used a 7.4 pushrod.


tell me that is the problem!!

thanks for the help

 

If anything, your pushrods would be longer now since those heads have been milled, so I doubt that would be causing a noise. If anything that should quiet it down some.

 

that is not what i want to here...LOl i was hoping it would be that easy!

 

loose rocker bolt is an option.

torque to 22 lb/ft and use blue loctite

 

Man,I have the same problem.I have the newer 918's and I get a tapping noise sometimes.I'm going to change'em out.Everything has been replaced when I did the swap.

 

The newer 918's I believe have a higher spring pressure so that might be your noise. Do you have stock rockers still?