BBC COMPLETE 320CC RECTANGLE PORT ALUMINUM CYLINDER HEADS

Big Block Chevy Aluminum Cylinder Heads - Assembled

320cc Intake Port, 119cc Chamber, Rectangle Port 

Pair (2) of big block Chevy ProComp aluminum cylinder heads. These heads are assembled with springs, valves, retainers, and locks installed. Comes with features normally found in heads costing much more, including:

• Hardened exhaust seats for unleaded fuel compatibility
• Bronze valve guides
• Manufactured with aircraft quality high grade aluminum alloy
• Multi-angle seat design for improved flow at low lifts
• Advanced port design for improved flow at all lifts
• Advanced combustion chamber design allows superb flame travel and burn
• Additional pushrod clearance machined along outside port walls
• Threaded accessory holes in ends of heads
• Retains stock intake/exhaust bolt locations
• Thick deck to resist warping and allow for additional milling if desired  

PC3021C Specs Intake Port Volume 320cc (rectangle) Combustion Chamber 119cc Intake Valve Size 2.250" Exhaust Valve Size 1.880" Valve Stem Dia. 11/32" Intake Port Size 1.8" W x 1.95" T Exhaust Port Size 1.9" W x 1.65" T Spring Pocket Dia. 1.730" Exhaust Crossover No Plug Angle Weight (per head - bare) 28 lbs.
Flow Numbers Intake CFM Exhaust CFM .100 .200 .300 .400 .500 .600 .700 74.3 166.11 245.36 308.05 339.84 360.43 374.31 .100 .200 .300 .400 .500 .600 .700 62 118 160 195 229 248 265	Assemblies Include: Valve Material stainless steel Valve Type 1 piece, swirl polished Valve Length +.250" intake, +.100" exhaust Valve Spring Dia. 1.525", single Spring Pressure (closed)  140lbs @ 1.900" Spring Pressure (open)  380lbs @ 1.200" Coil Bind 1.160" Recommend Lift .600"-.650" (flat tappet cams) Retainers 4140 Chromoly steel Valve Locks 10 degree, hardened steel

  These heads are a great choice and at a great price, you will not find this kind of quality for the price we have them listed at. Perfect for big stroker engines and in any other performance/race application where a quality head at an affordable price is desired. These heads are monsters and will flow a ton with the 320cc runner and rectangle intake port, they should handle up to about 700HP in as-is form without much problem. Further gains can be had with gasket matching and porting techniques.

  Aluminum material allows the benefit of higher compression ratios on the street compared to iron heads, not to mention how much weight they save compared to the factory cast iron ones! These ProComp big block heads have been tried and tested for a few years now with excellent results.

We also carry these as a non assembled bare pair. Check out our store for more cool products including other head selections including the oval port version!