SBC Chevy 350 E-Street Cylinder Heads 185cc 64cc Assembled Hyd Flat Tappet Early Model Small Block Chevy

The Edelbrock #5089 E-Street cylinder heads are designed for use with 1955-1986 SBChevy engines. American made quality and affordable performance, the heads feature as-cast ports and are designed for entry-level street applications.

SPECS

Series    E-Street

Grade Type    Performance

Quantity      Set of 2

Guide Plates     Included + Hardened Steel

Assemelbed to suit Camshaft Type  Hydraulic Flat Tappet camshaft

Horsepower Range      300-400 HP

Seat Angle          Exhaust 45 deg/Intake 45 deg

Combustion Chamber Volume   64 cc

Deck Thickness 0.5625 in

Intake Valve Diameter   2.02 in

Exhaust Valve Diameter    1.60 in

Intake Runner Volume  185 cc

Material               Aluminum

Rocker Stud Diameter    3/8”  0.375 in + included

Cylinder Head Valve Angle       23 deg

Valve Spring Diameter   1.46 in

Valve Spring Maximum Lift       0.550 in

Valve Stem Diameter     0.3438 in

Valve Spring Seat Pressure: 125 lbs

Valve Spring Open Pressure: 320 lbs @ .500" lift

Installation Notes           

Designed for use with hydraulic flat tappet camshafts only, not compatible with hydraulic roller camshafts; Use with Hydraulic Flat Tappet Camshafts .550" max lift. (NOT Compatible with Hydraulic Roller Camshafts); Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.; Requires hardened pushrods.; All E-Street Cylinder Heads are sold in pairs; Dyno tests showed a gain of 16 hp and 11 ft-lbs of torque over our overseas competitor