KA24DE high rev problem

[JS14.5]

I've had this problem for a while and couldn't find the problem.I can't rev past around 5K without it making a metal-like sound screeching noise.I've done some research and couldn't find a definite answer.Could it be the timing chain?Just thought I'd ask since some of you guys are 240 gurus

[mksue3240sx]

If your upper timing chain guide is gone and your cam chain is stretched enough it could do that. Pull your valve cover and take a look.

[JS14.5]

Thanks!how much do you think it will cost to get a new guide/chain

[JS14.5]

I haven't checked yet, but most likely I'm going to have to replace the upper.So my question is, should I also replace the lower while I'm at it?

[mksue3240sx]

May also be your lower timing chain and guides. Make sure to change the tensioner too. Plan on 200 or so in parts and a full day of wrenchin.

[JS14.5]

Probably more around $300 for the timing kit and a new headgasket.Should be pretty easy, just real time consuming lol