PowerPort ® 320 and 365 Cylinder Heads for Big Block Chevrolet Some parts are not legal for sale or use in California or other states with similar laws/regulations—see pg. 2 for details. WARNING: For Proposition 65 information, see pg. 2 Trick Flow PowerPort 365 and 320 cylinder heads for big block Chevy deliver the exceptional power potential and competition level durability required for heavily modified engines. Want proof? The extreme performance PowerPort 365 heads flow a massive 424 cfm @ .900" lift. The high-strength aluminum castings withstand very high compression and RPM. Plus, the heads’ rectangular-shaped 365cc CNC Competition Ported runners, 119cc heart-shaped chambers, 24° intake valve angles with 4° side cants for additional airflow volume, and high quality valvetrain components are dyno-proven to turn ordinary engines into contenders. In fact, these heads are so powerful they’re recommended for 500 plus cubic inch engines. The PowerPort 320 heads are no slouches in the power department either. With Fast As Cast® runners that flow almost as much as fully CNC-ported heads and many of the same features as the 365 heads, PowerPort 320 heads deliver the strong mid- to high-RPM performance that made Trick Flow famous—but for smaller cubic inch, lower RPM high performance applications. Cylinder heads are available fully assembled or as bare castings. Sold individually. PowerPort 320 Heads, Fast As Cast Runners, Assembled TFS-41410001-M22 2.250" intake valves and 1.545" dual valve springs, 320cc intake runners TFS-41410002-M22 2.250" intake valves and 1.560" dual valve springs, 320cc intake runners TFS-41410003-M22 2.300" intake valves and 1.560" dual valve springs, 320cc intake runners TFS-4141T003-M22 2.300" intake valves, 1.560" dual valve springs, and titanium retainers, 320cc intake runners TFS-4141T803-M22 2.300" intake valves, 1.640" dual valve springs, and titanium retainers, 320cc intake runners PowerPort 365 Head, CNC Competition Ported Runners, Assembled TFS-4141T804-C02 2.350" intake valves, 1.645" triple valve springs, and titanium retainers, 365cc intake runners Specifications Material: A-356-T61 aluminum Combustion Chamber Volume: PowerPort 320: 122cc CNC-profiled PowerPort 365: 119cc CNC-profiled Intake Port Volume: PowerPort 320: 320cc Fast As Cast PowerPort 365: 365cc CNC Competition Ported Intake Port Location: Stock Intake Port Dimensions: 1.750" x 2.500" rectangular Intake Gaskets: PowerPort 320: Mr. Gasket 121 PowerPort 365: SCE Gaskets 213105 Intake Valve Diameter: PowerPort 320 01/02: 2.250" (TFS-41400210) PowerPort 320 03: 2.300" (TFS-41400211) PowerPort 365: 2.350" (TFS-414C0211) Intake Valve Seat: Ductile iron interlock (TFS-41400271) Exhaust Port Volume: PowerPort 320: 137cc Fast As Cast PowerPort 365: 135cc CNC Competition Ported Exhaust Port Location: Raised .300" from stock Exhaust Port Dimensions: 1.770" x 1.930" D-shape Exhaust Gaskets: Fel-Pro 1412 or TFS-41490931 Exhaust Valve Diameter: PowerPort 320: 1.880" (TFS-41300212) PowerPort 365: 1.880" (TFS-414C0212) Exhaust Valve Seat: Ductile iron interlock (TFS-54400272) Valve Angles: Intake: 24°/4°, exhaust 15°/4°, Valve Guide Material: PowerPort 320: Bronze alloy (TFS-54500253-1) PowerPort 365: Bronze alloy (TFS-51600251) Valve Seals: PowerPort 320: Viton® fluoroelastomer (TFS-30400454) PowerPort 365: Viton® fluoroelastomer (TFS-54500455) Valve Seat Angles: 45° x multi-angle Valve Spring Pocket Diameter: 1.760" Valve Spring Cups: 1.640" (TFS-21400540) Valve Spring I.D. Locators: 1.550" (TFS-21400440) Valve Spring Retainers: 10° x 1.550" o.d. + .050" chromoly steel PowerPort 320: (TFS-41400423) 10° x 1.550" o.d. + .050" titanium (TFS-214T0525) 10° x 1.625" o.d. titanium (TFS-214T0620) PowerPort 365: 10° x 1.625" o.d. titanium (TFS-214T0650) Valve Stem Locks: PowerPort 320: 10° machined steel with lash cap recess (TFS-52400444) PowerPort 365: 10° steel bead lock with lash cap recess (TFS-54500445) Valve Springs 1.545" o.d. dual spring with damper PowerPort 320 Standard: (TFS-16094-16) 154 lbs. @1.950" installed hieght 453 lbs. @ 1.250 open 427 lbs. per inch rate .700" maximum valve lift Option 1: 1.560" o.d. dual spring with damper (TFS-16318-16) 240 lbs. @ 2.000" installed height 600 lbs. @ 1.280" open 500 lbs. per inch rate .700" maximum valve lift Option 2: 1.640" o.d. dual spring with damper (TFS-16414-16) 250 lbs. @ 2.000" installed height 800 lbs. @ 1.150" open 600 lbs. per inch rate .850" maximum valve lift Valve Springs, PowerPort 365: 1.645" o.d. triple spring (TFS-16948-16) 332 lbs. @ 2.100" installed height 950 lbs. @ 1.200" open 688 lbs. per inch rate .900" maximum valve lift Guideplates: PowerPort 320: 3/8" (TFS-41400624) Rocker Arm Studs: 7/16" (intake TFS-41400613, exhaust TFS-41400614) Rocker Arms: TFS-41400621 (1.7 ratio, 7/16" studs) Minimum Bore Diameter: 4.250" Cylinder Head Bolts: TFS-92002 Head Gaskets: TFS-41394540-040 Pushrod Length: Longer than stock required Spark Plugs: Autolite 3924 Viton® is a registered trademark of DuPont Performance Elastomers. TFS-4141T804-C02 Dyno Results PowerPort 365 Test Engine: 13.86:1 compression 572 c.i.d. with Trick Flow PowerPort® 365 cylinder heads (TFS-4141T804-C02), solid roller camshaft (285°/298° duration @ .050"; .900"/.828" lift; 114° lobe separation), 1.8/1.7 ratio shaft mount roller rocker arms, Trick Flow R-Series intake manifold (TFS-41400111), Holley Gen 3 Ultra Dominator 1,425 cfm carburetor, Trick Flow by Stainless Works headers (TFS-DBBC238250), Q16 racing fuel. Airflow Results PowerPort 320 and 365
