Engine Parts - Cylinder Heads

AFR MAGNUM BBC Aluminum Cylinder Heads - Fully Assembled Heads (Pair)

AFR's MAGNUM line of cylinder heads for the big block Chevy are available in Rectangular Ports with 305cc, 325cc,  345cc, 357cc, 377cc and 385cc runners. All heads are made with A356 aluminum and are equipped with high quality components throughout. Component upgrades and different machining options are available to customize your AFR heads for your specific build. hile the combustion chambers are offered with partial or full CNC machining with a bowl blend. Capable of flowing 390 CFM at 0.700" of lift. These AFR heads are assembled (with parts).

• With some domed aftermarket pistons, it may be necessary to slightly clearance or modify the piston due to our more efficient heart shaped combustion chamber design. Most of the newer designed dome profiles will clear. AFR strongly recommends material be removed from the piston and not the cylinder head. Our combustion chamber shapes are very critical to flow and altering the cylinder head can adversely affect flow and power production. It is the customers responsibility to verify proper piston to head clearance.
• Heads are designed for 3/8" pushrods. Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. AFR recommends the use of .120" thick-wall pushrods.
• For ideal geometry and wipe pattern AFR strongly recommends stud mount rockers part for applications below 7400 RPM and .790 lift. For applications above these limits shaft mount rockers are typically advised.

AFR MAGNUM BBC Aluminum Cylinder Heads - Bare Heads (Pair)

AFR's MAGNUM line of cylinder heads for the big block Chevy are available in Rectangular Ports with 305cc, 325cc,  345cc, 357cc, 377cc and 385cc runners. All heads are made with A356 aluminum and are equipped with high quality components throughout. Component upgrades and different machining options are available to customize your AFR heads for your specific build. hile the combustion chambers are offered with partial or full CNC machining with a bowl blend. Capable of flowing 390 CFM at 0.700" of lift. These AFR heads are bare (without parts).

• With some domed aftermarket pistons, it may be necessary to slightly clearance or modify the piston due to our more efficient heart shaped combustion chamber design. Most of the newer designed dome profiles will clear. AFR strongly recommends material be removed from the piston and not the cylinder head. Our combustion chamber shapes are very critical to flow and altering the cylinder head can adversely affect flow and power production. It is the customers responsibility to verify proper piston to head clearance.
• Heads are designed for 3/8" pushrods. Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. AFR recommends the use of .120" thick-wall pushrods.
• For ideal geometry and wipe pattern AFR strongly recommends stud mount rockers part for applications below 7400 RPM and .790 lift. For applications above these limits shaft mount rockers are typically advised.

Dart BBC Aluminum Cylinder Heads - Dart Aluminum PRO 1 Cylinder Head - Assembled (Pair)

Leave it to Dart Machinery to bring a real high performance marine aluminum cylinder head to market. These hard coat anodized marine heads feature a mil-Spec integral surface treatment option which dramatically enhances the corrosion resistance. 

These PRO 1’s race-proven cylinder heads include rolled valve angles, improved spark plug location, extra-long severe duty intake valves, raised exhaust ports, fast-burn chambers, an extra lifter valley head bolt feature, 1.550" valve springs, and lastly Inconel exhaust valves and must have in any marine cylinder head. The PRO 1 series of big block cylinder heads can be used with off-the-shelf pistons, valve train components, and performance intake manifolds. 

Standard PRO 1 big-block heads are available with a choice of three standard intake port sizes - 310cc, 325cc, and 345cc as well as two new CNC ported race versions. The CNC heads feature the same high quality valves and components but they are NOT hard coated (the coating creates a finish non-conducive to machining). This wide spectrum of options means you don’t have to settle for a one size fits all head. you can match the cylinder head to your engines size and power requirements. Using proprietary "Speed Flow" technology, Dart has produced as-cast ports and chambers which deliver more power and flow than ever before. So if your in the market to add horsepower that only a high quality aluminum head can offer then look no further.

• Premium alloy:  Dart aluminum heads are cast from virgin 356-T6 aerospace aluminum alloy for superior strength and integrity.
• Bolt on compatibility:  2° rolled valve angle and standard spacing.  Accommodates all stock accessories
• Heart-shaped 119cc chambers improve combustion efficiency.
• Raised spark plug location improves flame travel for a quicker, more complete burn - producing more power.
• Multi-angle intake seats and radiused exhaust seats dramatically increase airflow.
• Hardened exhaust seats are compatible with unleaded gasoline.
• Exhaust ports raised .300" to improve flow (requires 1" longer head bolts next to exhaust ports).
• Spark plug holes are machined and gasketed for 3/4" reach plugs.
• Manganese bronze valve guides extend cylinder head life and reduce stem wear.
• As-cast heads are bowl blended on 5-axis CNC machining centers.
• Head Assemblies include heavy-duty marine stainless steel intake valves and inconel exhaust valves.
• NEW Dielectric hardcoat surface treatment protects aluminum cylinder heads against corrosion from saltwater environments.

Dart BBC Aluminum Cylinder Heads - Dart Aluminum PRO 1 Cylinder Head with Valves Only (Pair)

PRO1 aluminum big-block cylinder heads deliver "out-of-the-box" airflow that beatsthe competition - at an unbeatable price!  Specifically designed forperformance marine engines, PRO 1 heads make Pro Stock airflow technologyaffordable for every big-block owner.

Inspired by our championship-winning Pro Stockdesigns, the PRO 1's race-proven features include rolled valve angles, improvedspark plug location, extra-long intake valves, raised exhaust ports, andfast-burn chambers - yet the PRO 1 can be used with off-the-shelf pistons, valvetrain components, and intake manifolds.  You get more power for your moneywith PRO 1.

Using advanced manufacturing techniques, we cast thePRO 1's ports with incredible accuracy.  This precision casting technologyduplicates the contours that were previously available only in hand-portedcylinder heads.

PRO 1 big-block heads are available with a choice ofthree different intake port sizes - 310cc, 325cc, and 345cc so you can match therunners to your engines displacement and RPM range perfectly.

• Premium alloy:  Dart aluminum heads are cast from virgin 356-T6 aerospace aluminum alloy for superior strength and integrity.
• Bolt on compatibility:  2° rolled valve angle and standard spacing.  Accommodates all stock accessories
• Heart-shaped 119cc chambers improve combustion efficiency.
• Raised spark plug location improves flame travel for a quicker, more complete burn - producing more power.
• Multi-angle intake seats and radiused exhaust seats dramatically increase airflow.
• Hardened exhaust seats are compatible with unleaded gasoline.
• Exhaust ports raised .300" to improve flow (requires 1" longer head bolts next to exhaust ports).
• Spark plug holes are machined and gasketed for 3/4" reach plugs.
• Manganese bronze valve guides extend cylinder head life and reduce stem wear.
• As-cast heads are bowl blended on 5-axis CNC machining centers.
• Head Assemblies include heavy-duty marine stainless steel intake valves and inconel exhaust valves.
• NEW Dielectric hardcoat surface treatment protects aluminum cylinder heads against corrosion from saltwater environments.

Final Assemblies Require Parts Kit which includes:  Valve springs,retainers, locks, seals, studs & guideplates.  (Sold Separately)

Dart Mercury 525, 600, 700 EFI Aluminum PRO 1 Cylinder Heads - Assembled (Pair)

Dart machinery has just introduced the ultimate Mercury Racing replacement aluminum cylinder heads for the Mercury Racing 525, 600, and 700EFI engines. These are available in three upgraded intake runner sizes 310CC, 325CC or 345cc ports. All heads have a Dart Marine exclusive chromate finish that provides a superior corrosion resistance extending the life of the heads in a harshest of marine environments. These heads are sold as heads w/valves only or completely assemble with inconel exhaust valves & dual valve springs.

Leave it to Dart Machinery to bring a real high performance marine aluminum cylinder head to market. These hard coat anodized marine heads feature a mil-Spec integral surface treatment option which dramatically enhances the corrosion resistance. 

These PRO 1’s race-proven cylinder heads include rolled valve angles, improved spark plug location, extra-long severe duty intake valves, raised exhaust ports, fast-burn chambers, an extra lifter valley head bolt feature, 1.550" valve springs, and lastly Inconel exhaust valves and must have in any marine cylinder head. The PRO 1 series of big block cylinder heads can be used with off-the-shelf pistons, valve train components, and performance intake manifolds. 

Standard PRO 1 big-block heads are available with a choice of three standard intake port sizes - 310cc, 325cc, and 345cc as well as two new CNC ported race versions. The CNC heads feature the same high quality valves and components but they are NOT hard coated (the coating creates a finish non-conducive to machining). This wide spectrum of options means you don’t have to settle for a one size fits all head. you can match the cylinder head to your engines size and power requirements. Using proprietary "Speed Flow" technology, Dart has produced as-cast ports and chambers which deliver more power and flow than ever before. So if your in the market to add horsepower that only a high quality aluminum head can offer then look no further.

• Premium alloy:  Dart aluminum heads are cast from virgin 356-T6 aerospace aluminum alloy for superior strength and integrity.
• Bolt on compatibility:  2° rolled valve angle and standard spacing.  Accommodates all stock accessories
• Heart-shaped 119cc chambers improve combustion efficiency.
• Raised spark plug location improves flame travel for a quicker, more complete burn - producing more power.
• Multi-angle intake seats and radiused exhaust seats dramatically increase airflow.
• Hardened exhaust seats are compatible with unleaded gasoline.
• Exhaust ports raised .300" to improve flow (requires 1" longer head bolts next to exhaust ports).
• Spark plug holes are machined and gasketed for 3/4" reach plugs.
• Manganese bronze valve guides extend cylinder head life and reduce stem wear.
• As-cast heads are bowl blended on 5-axis CNC machining centers.
• Head Assemblies include heavy-duty marine stainless steel intake valves and inconel exhaust valves.
• NEW Dielectric hardcoat surface treatment protects aluminum cylinder heads against corrosion from saltwater environments.

Dart Mercury 525, 600, 700 EFI Aluminum PRO 1 Cylinder Heads - with Valves Only (Pair)

Dart machinery has just introduced the ultimate Mercury Racing replacement aluminum cylinder heads for the Mercury Racing 525, 600, and 700EFI engines. These are available in three upgraded intake runner sizes 310CC, 325CC or 345cc ports. All heads have a Dart Marine exclusive chromate finish that provides a superior corrosion resistance extending the life of the heads in a harshest of marine environments. These heads are sold as heads w/valves only or completely assemble with inconel exhaust valves & dual valve springs.

PRO1 aluminum big-block cylinder heads deliver "out-of-the-box" airflow that beatsthe competition - at an unbeatable price!  Specifically designed forperformance marine engines, PRO 1 heads make Pro Stock airflow technologyaffordable for every big-block owner.

Inspired by our championship-winning Pro Stockdesigns, the PRO 1 's race-proven features include rolled valve angles, improvedspark plug location, extra-long intake valves, raised exhaust ports, andfast-burn chambers - yet the PRO 1 can be used with off-the-shelf pistons, valvetrain components, and intake manifolds.  You get more power for your moneywith PRO 1.

Using advanced manufacturing techniques, we cast the PRO 1's ports with incredible accuracy.  This precision casting technologyduplicates the contours that were previously available only in hand-portedcylinder heads.

• Premium alloy:  Dart aluminum heads are cast from virgin 356-T6 aerospace aluminum alloy for superior strength and integrity.
• Bolt on compatibility:  2° rolled valve angle and standard spacing.  Accommodates all stock accessories
• Heart-shaped 119cc chambers improve combustion efficiency.
• Raised spark plug location improves flame travel for a quicker, more complete burn - producing more power.
• Multi-angle intake seats and radiused exhaust seats dramatically increase airflow.
• Hardened exhaust seats are compatible with unleaded gasoline.
• Exhaust ports raised .300" to improve flow (requires 1" longer head bolts next to exhaust ports).
• Spark plug holes are machined and gasketed for 3/4" reach plugs.
• Manganese bronze valve guides extend cylinder head life and reduce stem wear.
• As-cast heads are bowl blended on 5-axis CNC machining centers.
• Head Assemblies include heavy-duty marine stainless steel intake valves and inconel exhaust valves.
• NEW Dielectric hardcoat surface treatment protects aluminum cylinder heads against corrosion from saltwater environments.

Final Assemblies Require Parts Kit which includes:  Valve springs,retainers, locks, seals, studs & guideplates.  (Sold Separately)

Dart Small Block Chevy Pro1 Platinum Cylinder Heads Assembled, Pair

• Pro1 Platinum Aluminum 180cc runner
• 64cc chamber
• Straight or Angle Plug
• 2.020/1.600valves
• 1.437 springs

Performer RPM 454-R Marine Rectangular Port, 118cc, pair of heads with valves only

Designed for 396-502 cid big block Chevy engines, these heads include heavy-duty, 1.89" Inconel exhaust valves that provide the added durability needed for marine applications and have one-piece stainless steel 2.25" intake valves with hardened tips and swirl-polished heads. The high-velocity flow capabilities of Edelbrock Performer RPM cylinder heads provide increased torque across a wide rpm range that's ideal for marine use. Cast from A356 aluminum and heat-treated to T6 specifications. The oval-port heads have 110cc chambers and the rectangular port heads have 118cc chambers. Both the oval and rectangular port heads are hard anodized to protect the aluminum in the harsh marine environment. Edelbrock Big Block Chevy marine heads are sold with seals and valves only for a variety of combinations. Match with a proven Harden Marine Cam Kit for the ultimate in performance and value.

Dart Iron Eagle Big Block Chevy Cylinder Heads - 345cc Hydraulic Roller Cam Parts Kit

Final Assemblies Require Parts Kit which includes valve springs, retainers, locks, seals, studs & guideplates.

Dart Cylinder Head Stud and Bolt Kit

The Dart Cylinder Head Stud and Bolt Kits are designed specifically for use with your Dart heads, ensuring a secure and trouble-free installation. Exact tolerances ensure that gaskets and cylinder heads just glide into position and align perfectly. These kits are manufactured from premium 8740 chrome moly steel and heat treated to 190,000 psi. They are thread rolled after the heat treating process, which vastly improves their fatigue tolerance compared to studs threaded before heat treatment. High-quality, parallel ground washers included!

• Big Block Chevy
• Designed to fit Dart Big M Blocks
• 12-Point

Merc Heads Install Kit