E-street cylinder heads for 1986 & earlier
small-block Chevy with straight plugs
with 70cc combustion chambers (sold in pairs)...................................#EDE5073
with 64cc combustion chambers (sold in pairs)...................................#EDE5089
Technical Notes: Use with hydraulic camshafts .550" max lift. Recommended spark plugs
are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.
Requires
hardened pushrods. Not legal for sale or use on pollution controlled motor vehicles.

SMALL-BLOCK CHEVY: #EDE5073 | #EDE5089
Chamber volume....................................70cc | 64cc
Deck thickness ................................................9/16"
Valve spring diameter (1.750" installed height) ....1.25"
Maximum valve lift ........................................0.550"
Rocker stud diameter (with guide plate)................3/8"
Pushrod diameter............................................5/16"

Intake
Port volume ...........................................................185cc
Valve size................................................................2.02"

Exhaust
Port volume .............................................................60cc
Valve size................................................................1.60"
SPECS
E-street cylinder heads for small-block Ford
with 1.90" intake valves (sold in pairs) ................................................#EDE5023
with 2.02" intake valves (sold in pairs) ................................................#EDE5025
Technical Notes: Use with hydraulic camshafts less than .550" max lift.
Recommended
spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.
Requires hardened pushrods. 289-302 c.i.d. with 7/16" head bolts requires #9680 head bolt
bushing kit. 1.90" heads are ideal for stock pistons; 2.02" heads require additional piston to
valve clearance.
Not legal for sale or use on pollution controlled motor vehicles.