Dart Iron Eagle Big Block Chevy Cylinder Heads - 308cc /310cc/325cc Hydraulic Roller Cam Parts Kit

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

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 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 Big M Cast Iron Block - 10.600" Deck, 4.600" Bore, Steel Caps, New Race Series

• Siamesed extra-thick cylinder walls resist cracking & improve ring seal (minimum .300" thick with 4.625" bore).

• Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.
• Standard 9.800" and extra-tall 10.200" deck heights available for stroker engines.
• Four-bolt main bearing caps in steel or ductile iron have splayed outer bolts for extra strength.
• Crankshaft tunnel has clearance for a 4.500" stroke crank with steel rods without grinding.
• True "priority main" oil system lubricates the main bearings before the lifters.
• Oil filter pad is drilled and tapped for an external oil pump.
• Rear four-bolt cap uses standard oil pump and two-piece seal - no adapter required.
• Lifter valley head stud bosses prevent blown head gaskets between head bolts.
• External block machining reduces weight without sacrificing strength.
• Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.
• Dual oil pan bolt patterns fit standard and notched oil pans.
• Bellhousing flange and rear main bearing are reinforced with ribs to resist cracks.

Dart Iron Eagle Big Block Chevy Cylinder Heads - Iron Eagle w/Valves Only (Pair)

Dart Heads are exclusively custommanufactured to marine specifications by Dart Marine!
Dart Iron Eagle Cylinder Heads by Dart feature Inconel Exhaust Valvesfor Superior Reliability in High Heat.

Dart designedthe Iron Eagle big block heads for high performance marineapplications. They developed two rectangular ports: a high-velocity 308cc intakerunner that produces incredible torque and a 345cc version that’s perfect forbig-inch, high-rpm Rat motors. The Iron Eagle’s raised exhaust port outperforms its cast-iron competition but still fits most standard headers.

Their dedicated tooling allows them to cast the ports with incredibleprecision so you get maximum flow without spending big bucks on porting. Theyrotated the valve angles two degrees and duplicated the efficient heart-shapedcombustion chambers originally developed for their championship-winning RaceSeries aluminum heads.

Iron Eagle big block heads have standard features you won’t find in factorycastings and after market replacement heads. Premium bronze valve guides,multi-angle intake valve seats, and hardened and radiused exhaust seats areincluded with every Iron Eagle head.

When you want premium performance at an economical price, demand Dart IronEagle heads!

• Heart-shaped 119cc chambers improve combustion efficiency.
• Multi-angle intake seats, radiused exhaust seats, and precision cast valve bowls produce excellent airflow without hand porting or expensive CNC machining.
• Hardened exhaust seats are compatible with unleaded gasoline.
• Exhaust ports raised .300" to improve flow (requires 1" longer head bolts next to exhaust ports).
• Phosphorous bronze exhaust valve guides resist heat produced by low compression engines.

Partial Head Assemblies

• Partial head assemblies include: Severe duty stainless steel intake and inconel exhaust valves, valve job, and protective water jacket coating.

Final Assemblies Require Parts Kit whichincludes valve springs, retainers, locks, seals, studs & guideplates.(Sold Separately)

An optional anti-corrosive protectant is available that consists of afluorinated polymer with a Teflon base.  It's blue in color applied only tothe water jackets.

Dart Iron Eagle Marine Cylinder Heads Big Block Chevy, Assembled (Pair)

Dart designed theIron Eagle big block heads for high performance marine applications. Theydeveloped two rectangular ports: a high velocity 308cc intake runner thatproduces incredible torque and a 345cc version that’s perfect for big-inch, highRPM Rat motors. The Iron Eagle’s raised exhaust port out performs its cast-ironcompetition but still fits most standard headers.

Features:

• Heart-shaped 119cc chambers improve efficiency.
• Multi-angle intake seats, radiused exhaust seats, and precision cast valve bowls produce excellent airflow.
• Hardened exhaust seats for use with unleaded gasoline.
• Exhaust ports raised .300" to improve flow (requires 1" longer head bolts next to exhaust ports).

An optional anti-corrosive protectant is available that consists of afluorinated polymer with a Teflon base.  It's blue in color applied only tothe water jackets.

Dart Marine Cast Iron 496, 8.1L Big Block Chevy Cylinder Heads, 320cc, 2.190" x 1.800"

Bare Heads only, sold in pairs.

Material: Superior cast iron alloy
Comb Chambers: 107cc
Intake Valve Dia: 2.190”
Intake Port volume: 320cc
Intake Port Dim: Factory 8.1L GM
Int Port Location: Factory 8.1L GM Location
Intake Gasket: Factory GM 8.1L Gasket or Felpro # QMS96057
Exh Valve Dia.: 1.880”
Exh Port volume: 128cc
Exhaust Port Dim: 1.530”T x 1.800”W
Exh Port Location: Raised .050” from factory location
Exhaust Gasket: Factory GM 8.1L Gasket or Felpro # QMS95840
Flow, Intake: 341cfm @ .600” lift
Flow, Exhaust: 252cfm @ .600” lift
Flow Wet: N/A
Freeze Plugs: Dart PN# 32860000B 1 3/8 dia. Brass
Head Bolts: Factory GM head bolts + .270 Dowel Holes
Head Studs: N/A
Manifold: Factory GM or Dart
Milling: Min. 100cc .005” = 1cc flat mill only
Push Rod length: Must be measured / Factory GM 8.1L
Push rod Guide Plate: Dart Adjustable PN# 27001230-4
Retainers: 1.250” or 1.550”
Spark Plug: .750” Reach tapered seat
Spring Pockets: Inner step 1.265” outer step1.550”
Springs: 1.250” Dia. w/ Rotator & 1.550
Valve Length: Intake: 5.235” OAL Exh: 5.425” OAL
Valve Stem Dia: 11/32”
Valve Train: Factory GM valve train
Valve Guides: Integral guides
Valve Guide length: N/A
Valve Guide clearance: .3435” I.D (.002” w/ .3415 dia valve stem)
Valve Guide Spacing: Factory GM 8.1L
Valve Seats: Integral intake seat & Hardened ex. seat.
Valve Seat dia. 2.450” Int. & 2.000” Exh.
Valve Seat angles: 45°
Torque: Use factory GM torque procedures, Intake Manifold (M6 x 1) = 106 in lbs Rocker studs (M10 x 1.5) = 37 ft lbs, Valve Cover (M6 x 1) = 106 in lbs
Weight: 150 lbs pr.

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 inconnel 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 inconnel 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)

10.200" Deck, 4.250050" Bore, Ductile Caps

• Siamesed extra-thick cylinder walls resist cracking & improve ring seal (minimum .300" thick with 4.625" bore).

• Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.
• Standard 9.800" and extra-tall 10.200" deck heights available for stroker engines.
• Four-bolt main bearing caps in steel or ductile iron have splayed outer bolts for extra strength.
• Crankshaft tunnel has clearance for a 4.500" stroke crank with steel rods without grinding.
• True "priority main" oil system lubricates the main bearings before the lifters.
• Oil filter pad is drilled and tapped for an external oil pump.
• Rear four-bolt cap uses standard oil pump and two-piece seal - no adapter required.
• Lifter valley head stud bosses prevent blown head gaskets between head bolts.
• External block machining reduces weight without sacrificing strength.
• Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.
• Dual oil pan bolt patterns fit standard and notched oil pans.
• Bellhousing flange and rear main bearing are reinforced with ribs to resist cracks.

10.200" Deck, 4.500" Bore, Steel Caps

• Siamesed extra-thick cylinder walls resist cracking & improve ring seal (minimum .300" thick with 4.625" bore).

• Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.
• Standard 9.800" and extra-tall 10.200" deck heights available for stroker engines.
• Four-bolt main bearing caps in steel or ductile iron have splayed outer bolts for extra strength.
• Crankshaft tunnel has clearance for a 4.500" stroke crank with steel rods without grinding.
• True "priority main" oil system lubricates the main bearings before the lifters.
• Oil filter pad is drilled and tapped for an external oil pump.
• Rear four-bolt cap uses standard oil pump and two-piece seal - no adapter required.
• Lifter valley head stud bosses prevent blown head gaskets between head bolts.
• External block machining reduces weight without sacrificing strength.
• Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.
• Dual oil pan bolt patterns fit standard and notched oil pans.
• Bellhousing flange and rear main bearing are reinforced with ribs to resist cracks.

9.800" Deck, 4.500" Bore, Ductile Caps

• Siamesed extra-thick cylinder walls resist cracking & improve ring seal (minimum .300" thick with 4.625" bore).

• Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.
• Standard 9.800" and extra-tall 10.200" deck heights available for stroker engines.
• Four-bolt main bearing caps in steel or ductile iron have splayed outer bolts for extra strength.
• Crankshaft tunnel has clearance for a 4.500" stroke crank with steel rods without grinding.
• True "priority main" oil system lubricates the main bearings before the lifters.
• Oil filter pad is drilled and tapped for an external oil pump.
• Rear four-bolt cap uses standard oil pump and two-piece seal - no adapter required.
• Lifter valley head stud bosses prevent blown head gaskets between head bolts.
• External block machining reduces weight without sacrificing strength.
• Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.
• Dual oil pan bolt patterns fit standard and notched oil pans.
• Bellhousing flange and rear main bearing are reinforced with ribs to resist cracks.

9.800" Deck, 4.500" Bore, Steel Caps

• Siamesed extra-thick cylinder walls resist cracking & improve ring seal (minimum .300" thick with 4.625" bore).

• Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.
• Standard 9.800" and extra-tall 10.200" deck heights available for stroker engines.
• Four-bolt main bearing caps in steel or ductile iron have splayed outer bolts for extra strength.
• Crankshaft tunnel has clearance for a 4.500" stroke crank with steel rods without grinding.
• True "priority main" oil system lubricates the main bearings before the lifters.
• Oil filter pad is drilled and tapped for an external oil pump.
• Rear four-bolt cap uses standard oil pump and two-piece seal - no adapter required.
• Lifter valley head stud bosses prevent blown head gaskets between head bolts.
• External block machining reduces weight without sacrificing strength.
• Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.
• Dual oil pan bolt patterns fit standard and notched oil pans.
• Bellhousing flange and rear main bearing are reinforced with ribs to resist cracks.

Dominator Carburetor Flange, Tall Deck Oval Port Standard Water Jacket

Your ultimate choice for single carburetor application used on the very popular HP 500 from Mercury. Dart intake manifolds incorporate sophisticated wet-flow technology developed successfully. They don't make "universal" manifolds. Every Dart intake is engineered for a specific cylinder head, block and carburetor combination. This means that they've optimized the port shape, the plenum volumes, and the runner angle for each application. In numerous dyno tests we've yet to witness any manifold with as flat a torque curve as these.
Note: Merlin intakes offer optional brass water jacket.

Dominator Carburetor Flange - Fits Std. deck (9.800") Rectangular Port, Merlin Brass Water Jacket

Your ultimate choice for single carburetor application used on the very popular HP 500 from Mercury. Dart intake manifolds incorporate sophisticated wet-flow technology developed successfully. They don't make "universal" manifolds. Every Dart intake is engineered for a specific cylinder head, block and carburetor combination. This means that they've optimized the port shape, the plenum volumes, and the runner angle for each application. In numerous dyno tests we've yet to witness any manifold with as flat a torque curve as these.

Dominator Carburetor Flange, Standard Deck Oval Port Std Water Jacket

Your ultimate choice for single carburetor application used on the very popular HP 500 from Mercury. Dart intake manifolds incorporate sophisticated wet-flow technology developed successfully. They don't make "universal" manifolds. Every Dart intake is engineered for a specific cylinder head, block and carburetor combination. This means that they've optimized the port shape, the plenum volumes, and the runner angle for each application. In numerous dyno tests we've yet to witness any manifold with as flat a torque curve as these.
Note: Merlin intakes offer optional brass water jacket.

Standard Carburetor Flange, Tall Deck Oval Port Standard Water Jacket

Your ultimate choice for single carburetor application used on the very popular HP 500 from Mercury. Dart intake manifolds incorporate sophisticated wet-flow technology developed successfully. They don't make "universal" manifolds. Every Dart intake is engineered for a specific cylinder head, block and carburetor combination. This means that they've optimized the port shape, the plenum volumes, and the runner angle for each application. In numerous dyno tests we've yet to witness any manifold with as flat a torque curve as these.
Note: Merlin intakes offer optional brass water jacket.