Ok, first off...94 GT/ auto / 150k miles / headers / h-pipe / flowmasters / pulleys / shortened belt (no a/c)
Now... ran a furious 16.0 on 1/4 mi track! At track I tried to bump timing to 17, 14, 12, 10 and back to it's present location: 7. The problem is a sqeal that seems to be coming from the valvetrain. Originally I thought it was a spark-knock or ping as I discovered the plugs were triple platinum. At this time I replaced plugs with a standard core, full tune-up, and with the forums advise I replaced the MAF (stock) as well. At 7 degrees I get min. sqeal around 2800-3200 rpm usually on a downshift/kickdown. This happens at normal engine temp. and worse on hotter days. I've experienced this before on older 302's with too much timing (not this case) or borderline over-heating issues (not my case either), any suggestions? Bad lifter or pushrod? It's a solid audable sound like a knock or ping, but it's not a rod knock sound. When car is at idle and in park, I can hit the pedal and get same result and it seems to be coming from top end. Also after this rmp band of 2800-3200 it smoothes right back out? Mid-grade fuel, no premium but not cheap stuff. I'm clueless and need help. It's a nice daily driver and still has a clean throttle response, but the noise means issues, how bad of an issue is what I'm trying to find out!
Now... ran a furious 16.0 on 1/4 mi track! At track I tried to bump timing to 17, 14, 12, 10 and back to it's present location: 7. The problem is a sqeal that seems to be coming from the valvetrain. Originally I thought it was a spark-knock or ping as I discovered the plugs were triple platinum. At this time I replaced plugs with a standard core, full tune-up, and with the forums advise I replaced the MAF (stock) as well. At 7 degrees I get min. sqeal around 2800-3200 rpm usually on a downshift/kickdown. This happens at normal engine temp. and worse on hotter days. I've experienced this before on older 302's with too much timing (not this case) or borderline over-heating issues (not my case either), any suggestions? Bad lifter or pushrod? It's a solid audable sound like a knock or ping, but it's not a rod knock sound. When car is at idle and in park, I can hit the pedal and get same result and it seems to be coming from top end. Also after this rmp band of 2800-3200 it smoothes right back out? Mid-grade fuel, no premium but not cheap stuff. I'm clueless and need help. It's a nice daily driver and still has a clean throttle response, but the noise means issues, how bad of an issue is what I'm trying to find out!