https://www.proformparts.com/product-detail/66517RC/engine-harmonic-balancer-cover-fits-sb-chevy-using-6-3-4-in-damper-red
Engine Harmonic Balancer Cover; Fits SB Chevy using 6-3/4 In. Damper; Red | #66517RC
These patented harmonic balancer covers offer improved readability, more stable Top Dead Center indication and timing accuracy, enhanced appearance for a...