Sorry that i had to open a new post for this...just came to me. My 82 Z28 has about 166 000 KM (kilometers, not miles) on the original 305. Every time i floor it, the car pulls right away, and really nicely, but there is sort of like an amplified engine sound coming from underneath....by the tranny. Its loud and the sound pitch increases as the engines rpm's go up, but it doesnt sound like an engine at all. I dont know how to explain it. I'll try to get a video up but for now, and suggestions would be appreciated