Valve rattle?Detnation?Spark blowout?Bad gas?
I got a problem. When my car gets in the higher rpms, I hear what sounds like valve rattle or something. The valve rattle noise wasn't there when my car was n/a a month ago and started when I added the blower. I thought it was spark blowout so I installed a HI-6 and LX92 coil today. I had a HI-6S and PS91 at first. I thought this would fix it but its still doing it. I'm running 93 octane gas, Autolite 3923's gapped at .030, HI-6 ignition box and LX92 coil, 11 degrees timing and the chip is controlling the rest, SCT tune which I'm not fully satisfied about. Anyone else had this problem or any advice on pin pointing the problem. My tuner is in New Orleans so it may be a while before I can back to him.
Thanks