Dorman Harmonic Balancers 1978-68 V8-5.7L/350 cid, 6.6L/400 cid, 7.0L/428 cid, 7.5L/455 cid, GM Pontiac, Buick, Oldsmobile (594-158) Dorman Harmonic Balancer 1978-68 V8-5.7L/350 cid, 6.6L/400 cid, 7.0L/428 cid, 7.5L/455 cid, GM Pontiac, Buick, Oldsmobile (594-158)