Edelbrock . 60659

1986-Earlier Small Block ChevyPort Volumes: 185cc/65cc70cc Combustion ChamberBare Head, Sold Individually Combustion Chamber Volume:64cc or 70ccIntake Runner Volume:185ccExhaust Runner Volume:65ccIntake Valve Diameter:2.02''Exhaust Valve Diameter:1.60''Valve Stem Diameter:11/32''Valve Guides:Manganese BronzeDeck Thickness:5/8''Valve Spring Diameter:1.46''Valve Spring Maximum Lift:0.575''Rocker Stud:3/8''Guideplate:Hardened SteelPushrod Diameter:5/16''Valve Angle:23&deg;Exhaust Port Location:StockSpark Plug Fitment:14mm x 3/4'' Reach, <br>Gasket Seat<br><br>Valve LiftIntakeExhaust.100''6652.200''12797.300''185127.400''230146.500''238156.600''239162.700''N/AN/AFlow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28'' H2O<br><br>Installation Notes: When using stock rockers on S/B Chevy Performer & Performer RPM heads, .100'' longer than stock pushrods are required. Due to valve-to-cylinder bore interference, SB-Chevy heads may not be used on engines with less than 4'' bore (262, 265, 283, 305, 307 c.i.d.) except with camshafts having less than .450'' valve lift.Tech Tip: To gain more spark plug clearance, Edelbrock recommends using Champion RC Series plugs such as the RC12YC (P/N 192-49776). They are 0.230'' shorter than a conventional spark plug and have a 5/8'' hex for easier access.<br><br>Heat crossover is machined for 50-state emissions legal...