EDELBROCK

Cylinder head specifications: combustion chamber volume: 64 cc / 70 cc, intake runner volume: 185 cc, exhaust runner volume: 65 cc, intake valve diameter: 2.02 in., exhaust valve diameter: 1.60 in., valve stem diameter: 11/32 in., valve guides: maganese bronze, deck thickness: 5/8 in., valve spring diameter: 1.46 in., valve spring maximum lift: .575 in., rocker stud: 3/8 in., guideplate: hardened steel, pushrod diameter: 5/16 in., valve angle: 23 Deg., exhaust port location: stock, spark plug fitment: 14 mmx .750 reach, gasket seat. -these performer cylinder heads are designed for 302, 327, 350 & 400 cid small-block chevy engines up to 1986. These cylinder heads include your choice of 64 cc (in order to retain stock compression ratio on 1970 & earlier small-blocks) or 70 cc combustion chambers & high flow intake & exhaust ports. Complete heads include larger-than-stock 1.46 in. valve springs to handle most high-lift cams. These heads retain the stock intake port location for compatibility w/ standard manifolds & headers. Heat crossover is machined for 50-state emissions legal performance. *-match w/ Edelbrock head gasket sets on pages 126-128. When using hot air choke q-jet carbs & performer manifold w/ above heads, choke kit #1932 is required. Recommended spark plugs are champion rc12yc or equivalent 14 mmx 3/4 in. reach w/ flat gasket seat.