YOU ALL WANTED THEM TO HERE THEY ARE! BIG BLOCK CHEVROLET FULLY ASSEMBLED PROCOMP HEADS PART # 3021. THESE ARE THE SAME HEADS WE HAVE BEEN SELLING, NOW THEY COME COMPLETE, READY TO BOLT ON!! YOU WONT FIND A BETTER PRICE ANYWHERE ON THESE HEADS. THESE ARE BLOWOUT PRICED AT $1035.00. ADD $400.00 FOR CNC POLISHED. THESE HEADS ARE GOOD UP TO 6500 RPM. BELOW ARE THE SPECS.


Aircraft Grade 356A T-6 Aluminum Alloy

115cc Combustion Chamber, High Flow 320cc Intake Runners

Fits All OEM Bolt Pattern Manifolds, Intake Bolt Standard OEM Length

8 Bolt Exhaust Flange, Square Port Exhaust, 15/24 Degree Valve Angle

Manganese Bronze Valve Guides, 3 Angle Cut Valve Seats

Uses Full Size Plug AGF-22, Takes Felpro 1275 bigger gasket set, Felpro 1047 Head Gasket Set

65 ft.lb Torque Specs, .400" thick deck can be milled down to 54cc. ,

Can be Used with Nitrous, Ultra High Compression, & Turbo/Superchargers,

Suggested Roller Cam Base of 1.130", Machined for 7/16" Rocker Studs

ASSEMBLED FEATURES INCLUDE;

4324 S/S Intake Valves- 2.250 + 0.250, OAL 5.494" (11/32" stem)

4317 S?S Exhaust Valves- 1.88 + 0.100", OAL 5.522" (11/32" stem)

7deg. Valve Locks +.145

4140 Steel Retainers 1.400 x 1.060 x 0.690

Valve Springs Rated at .750" Max Lift, Single Springs w/Dampner, OD 1.542"

Spring Pressure; Intake, 1.805" @ 165lbs, Exhaust 1.770"@ 180lbs

Coil Bind @ 750lbs.

Installed Spring Height-Intake 1.82/Exhaust 1.87

Installed spring height should be checked with your camshaft specs of your application.


Flow Test Data @28" CFM Water Intake (according to manufacturer)

LIFT 100 200 300 400 500 600 700
INTAKE 74.83 166.11 245.36 308.05 339.84 360.43 374.31
EXHAUST 62.0 118.0 160.0 195.0 229.0 248.0 265.0

Seller Phone Number: 800 787 8763

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