Guys, I know we can't tell a whole lot from these pictures, but what appears out of the ordinary to you with this engine?

Picture number 3 looks like there was massive blowby/worn valve guides on the back cylinder. That's all I gathered.


http://i20.photobucket.com/albums/b2...y/CIMG1098.jpg

http://i20.photobucket.com/albums/b2...y/CIMG1097.jpg

http://i20.photobucket.com/albums/b2...y/CIMG1099.jpg

 

How many miles on that motor? Looks like mine did on my #8. The cylinder was worn so much, oil would just blow by the rings and it smoked like a freight train. It had 141K on it, so I pulled it and had it bored .030 and rebuilt it.

 

thats what it looks like to me take off the valve springs and see if you can rock the valve stem back and forth. its either that or seals?

 

Some of the valve springs look newer than the others. Maybe that was the problem once upon a time.

 

Unfortunately, this engine is long gone.

It was what was in the car when I bought it, and spun something after only 3 months. Not sure if it was a rod, cam or main bearing. There was a LOUD BANGING sound coming from the bottom of the block when you tried to apply throttle (But no noise at idle), and the engine would backfire through the intake.

The weird part is that a PO owner told me this was not the original engine. According to him, the original engine threw a rod through the bottom of the block and he had it replaced with this 305 crate motor. I am estimating (from what I was told) it had somewhere around 60k when I bought the car

 

At least one problem with that motor, is rolled cam lobes...

Look how far down in its bore the #8 lifter is. That lobe and lifter have lost about 1/8" of metal, compared to others.

If an exh is rolled, then that cyl will fill up with intake charge somewhat sometimes, and then fire; but the exh gas will have nowhere to go, and will simply continue to get compressed in there (the banging). Then the next time that int opens, the hot gases will come out through the intake, and light off the material in the manifold (the backfiring).

At teh same time of course, rolled lobes FILL UP the motor with metal chips, which DESTROY cranks and bearings.

 

Sofakingdom, THANK YOU! Very observative. For the past 2.5 years I have been scratching my head on what happened to this motor. Now let me ask, what can cause a flattened cam lobe? At the time the motor had Mobil1 5w30 oil in it. When I first got this car, I used to do dumb thing (Like rev to 5500rpm in N when the engine was still cold to show off). I was young and dumb. Albeit only 2.5 years in the past now, but it seems like another lifetime compared to my knowledge now.

This car has taught me everything I know. I did manage to screw up several things in the process, but in hindsight, I gotta say it was worth the knowledge.

Now back on topic, this makes perfect sense. The kid I bought the car from, gave me a cam along with the car he intended to install but never did (Good thing he didn't because it was a NON COMPUTER CONTROLLED cam), and a box of Lunati lifters. However, when I opened the box, the lifters appeared to be stock, suggesting that the Lunati lifters had been installed into the engine.

Allow me to link you to the original post I made the night this motor was on It's death bed:

https://www.thirdgen.org/forums/tech...-what-now.html

hitman suggested in this thread the same thing you did about the cam.