Quote:
Originally Posted by grandville455
Harmonic balancer bolt, or pulley bolts loose
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I had checked the balancer and pulley bolts when I first heard the sound.
I just took the belts off and sound was still there. Lower pulley bolts were tight but I removed it antway, sound seems to be gone(doesn't really make sense). I'm going to let engine cool off and fire it again later and see if it really went away. Sound is more noticable when engine is cold. Lower pulley appears to be out of round at low rpms but spins smooth with a little more rpms.
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73 firebird 455 6x-4 heads 350 turbo 3.73 gears
1/8 7.65 @ 90.95
1/4 11.96 @ 112.60
new best in 1/8th 7.57@91 mph(4-13-12)