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- 1986 & Earlier Small Block Chevy 302-400ci
- Valve Springs for Hydraulic Flat Tappet
- Port Volumes: 185cc/75cc
- Combustion Chamber size: 64cc
- Valve Sizes: 2.02"/1.60"
- Straight Spark Plug
- Assembled, Sold Each
Installation Notes: When using stock rockers on SB-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.Combustion Chamber Volume: 64cc Intake Runner Volume: 185cc Exhaust Runner Volume: 75cc Intake Valve Diameter: 2.02' Exhaust Valve Diameter: 1.60' Valve Stem Diameter: N/A Valve Guides: Deck Thickness: 9/16' Valve Spring Diameter: 1.46' Valve Spring Maximum Lift: 0.575' Rocker Stud: 3/8' Guideplate: Hardened Steel Pushrod Diameter: 5/16' Valve Angle: 23° Exhaust Port Location: Stock Spark Plug Fitment: 14mm x 3/4' Reach,
Gasket SeatValve Lift Intake Exhaust .100' 61 53 .200' 129 106 .300' 186 147 .400' 231 185 .500' 250 199 .600' 254 203 .700' 253 209 Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28' H2O
Since founder Vic Edelbrock Sr. began building performance intake manifolds in 1938, Edelbrock has grown into one of the most trusted names in American high-performance parts, from carburetors and intake manifolds to cylinder heads, crate engines, and EFI systems. JEGS has spent decades supplying Edelbrock components to racers, engine builders, and street enthusiasts, backing this extensive lineup with in-house technical support, fast shipping, and a Price Match Guarantee so you can choose proven Edelbrock parts with confidence.
Fully CNC'd Ports and Combustion Chambers!
For the ultimate in performance, Edelbrock's E-CNC cylinder heads are the answer. These cylinder heads are fully CNC ported for maximum horsepower and torque, making them ideal for high-performance street and light duty racing applications. They also feature high-quality lightweight valve springs and heavy duty hardware for maximum lift and maintain the stock exhaust port location. Made In The USA!
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Features:
- Features fully CNC machined intake ports, combustion chambers and exhaust ports for improved performance
- Maintains the stock 23° valve angle and intake flange bolt pattern for use with 1986 and earlier intake manifolds
- Delivers up to 30-60 horsepower over Performer RPM Cylinder Heads
- E-CNC 225 Heads (p/n 350-61205 & 350-61209) features 7/16" studs and angled spark plugs
- Ideal for high performance street and light duty racing applications


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