New motor...metal in oil and knocking
Hello, I recently bought a "new" 383 crate motor from a machine shop in Pennsylvania. I put it in my 67 RS-SS. Ive had the motor for about 6 months now. The car used to run pretty good but Ive always noticed metalic flakes in the oil. Ive put probably about 200 miles on the car since I put the new motor in. I just thought the metalic flakes were present because of it being a new motor and I figured the oil would clean up over time. Ive change the oil three times, still there is metal in oil. The oil pressure has always been steady = 60 - 70psi driving and 20-25psi at warm idle.
Ok, so the motor always ran pretty good except for the metal in oil and also I did notice some rattling under load which may have been detonation. Due to the motor having 10.8 to 1 CR (aluminum heads) I mixed Turbo blue (110 octane) in with the premium gas 50/50 which may have helped a bit.
Yesterday, I took my camaro for a drive and again noticed the rattling. It seemed to be a little worse than before. I got into it a tad...maybe only took it to 4 grand, and as I was coming out of the throttle it sounded like something broke and the rattling turned into a loud CLAT CLAT CLAT. Doesnt sound like a knock to me but I am not very mechanically inclined. I was only about a mile away from home so I did drive it home...slowly. CLAT CLAT CLAT the whole way. The oil pressure did not change at all and the car never got above 200. When I got home I took the valve covers off and did not notice anything out of the ordinary except for what appeared to be ALOT of metallic flakes in oil in the head galleys under the valve covers. No big pieces of metal, just a very sparkly tint to the oil I could see making the oil look almost silver in color. While under the valve covers, I also noticed that all of the lifters appear to be pretty loose...when the valve is closed I can shake them from side to side and hear them rattle. Should I be able to shake the lifters from side to side and be able to hear them make a noise?
Anything I could look for other than what Ive already looked for? Any advise or special tests I could do please let me know. Im not sure where I should go from here but I dont want to start the car anymore until I find the problem. What do you think? Can I send the oil somewhere to get it tested? How can I rule out a rod knocking or a wristpin?
The motor has:
Scat crank / rods
Comp hyd roller cam .500 approx
Pro Comp 190cc heads
Aluminum roller lifters
dual plane intake
Demon 750 vac sec carb
10.8 - 1 CR
I will check for a cracked flexplate and loose torque converter bolts tomorrow. It definately felt like the loud CLAT I hear now resulted in me getting in the throttle a bit.
Last edited by derek9448; Jul 12th, 10 at 10:18 AM.