My brother's Turbo Limited had a tick, so I pulled the driver's side valve cover and sure enough, the #3 exhaust valve rocker wasn't moving much.
I tore the engine down and replaced the cam and lifters with a GM cam and GM lifters and put it all back together. Car started up fine and oil pressure came up quickly because I primed the engine. I was able to run the car for about 10 minutes at 3000 rpm before the #3 exhaust header started glowing red.
I had to leave the car for a month, and when I came back, I took off the heads as the diagnosis for the likely cause was a burnt valve. Sure enough, #3 exhaust valve was red.
I am going to put on another set of heads I have lying around, but the question I have is what caused the burnt valve? The engine had a slight miss when breaking in the cam, but it was barely perceptible to me, and a friend pointed it out.
Could the rounded #3 exhaust lobe have weakened the #3 exhaust valve? How come the #3 exhaust header didn't start to glow until the new cam and lifters were in?
I tore the engine down and replaced the cam and lifters with a GM cam and GM lifters and put it all back together. Car started up fine and oil pressure came up quickly because I primed the engine. I was able to run the car for about 10 minutes at 3000 rpm before the #3 exhaust header started glowing red.
I had to leave the car for a month, and when I came back, I took off the heads as the diagnosis for the likely cause was a burnt valve. Sure enough, #3 exhaust valve was red.
I am going to put on another set of heads I have lying around, but the question I have is what caused the burnt valve? The engine had a slight miss when breaking in the cam, but it was barely perceptible to me, and a friend pointed it out.
Could the rounded #3 exhaust lobe have weakened the #3 exhaust valve? How come the #3 exhaust header didn't start to glow until the new cam and lifters were in?