1986-Earlier Small Block Chevy
|Combustion Chamber Volume:||64cc or 70cc|
|Intake Runner Volume:||185cc|
|Exhaust Runner Volume:||65cc|
|Intake Valve Diameter:||2.02''|
|Exhaust Valve Diameter:||1.60''|
|Valve Stem Diameter:||11/32''|
|Valve Guides:||Manganese Bronze|
|Valve Spring Diameter:||1.46''|
|Valve Spring Maximum Lift:||0.575''|
|Exhaust Port Location:||Stock|
|Spark Plug Fitment:||14mm x 3/4'' Reach, |
|Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28'' H2O|
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. Requires hardened pushrods.
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.
Heat crossover is machined for 50-state emissions legal performance.
Edelbrock Performer Aluminum Cylinder Heads are designed, cast and manufactured in the USA for unsurpassed quality. The top quality features incorporated into these heads include: highly effecient port design, state-of-the-art combustion chamber shapes, manganese-bronze valve guides, and threaded inserts in the exhaust bolt holes and rocker stud holes for strength and durability. They provide great torque and horsepower up to 5500 rpm and are 50 state emissions legal to fit emissions controlled engines, E.O. Number D-215-49!
If I were to change the springs to match with a hydraulic roller camshaft, what would be the max diameter spring I could use, and what would be the max lift I could use, before I run into clearance issues with the valve train?
Can these heads be used with hydraulic roller camshaft, like the zz4?
I have a 1969 Corvette with a 0.30 over 350. The pistons are TRW L2304F 11-1 compression. Will there be any interference between the pistons and cylinder head # 350-60909. Are longer push rods needed with roller tip rockers?
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