Our Ported Edelbrock heads are proven performers. We have several 10 second pump gas street cars out there running these heads. Just use the online coupon “cnceddie” when you finalize your purchase. This is in addition to the $50 rebate and 2 shirt offer that Edelbrock is currently running. Offer valid online only. Coupon valid from 4/23/2010 to 4/25/2010.