For Sale: Small-block Chevy 487X cylinder heads. Heads have been cleaned, magnafluxed and surfaced. All new iron guides (machined for positive seals) and shoulderless screw-in studs (no guide plates needed) installed. Valve bowls and seats enlarged for 2.02/1.60 valves, three-angle valve job. Heads come with all new Manley Street Flo valves. No springs, retainers, locks or seals. Over $700 invested. Sell for $400/pair.