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ATK Marine DMA1-GTP Ford 351W 5.8L Rebuilt Long Block
Forget patching cracked blocks when this fresh ATK Marine DMA1-GTP 351W gets you back on the water. Built to exact Ford Windsor specifications with tough iron heads. Install your high rise marine manifold. Run hard.
- One piece rear seal keeps oil contained safely
- External balance matches standard 351W marine couplers
- Cast iron heads match vintage raw water routing
Description
Internal cooling jacket rust and water reversion rust freeze marine commercial workboats during peak charter season. The ATK Marine DMA1-GTP Ford 351W 5.8L Rebuilt Long Block remedies catastrophic salt water erosion through a marine commercial long block repower. This 5.8L 8-Cylinder build develops 240HP, requiring installers to verify standard automotive rotation against reverse twin-screw propeller setups.
Cast with ASTM A48 Class 35 heavy iron, this ATK Marine engine core houses marine iron heads, brass core plugs, and a nodular iron crankshaft. Starter draw measures 165A on 12V circuits. Dry weight scales at 475 lbs within 29in length, 26in width, 28in height dimensions holding 5.0 quarts oil.
Key Features of ATK DMA1-GTP
Vessel mechanics buy ATK Marine DMA1-GTP Ford 351W 5.8L Rebuilt Long Block packages to drop marine-grade durability back into commercial trawlers and transport craft. A specialized marine-profile camshaft reduces valve overlap to stop exhaust elbow cooling water from siphoning into combustion chambers.
- Bore diameter measures 4.000in paired with a 3.500in stroke to deliver flat marine torque curves.
- Marine camshaft profile reduces valve overlap to prevent water reversion through exhaust risers.
- Corrosion-proof brass freeze plugs eliminate raw water rust-through failures inside bilge areas.
- Stellite-faced exhaust valves resist thermal erosion under protracted wide-open throttle operation.
- DMA1-GTP commercial core tolerances maintain thick hydrodynamic oil film under continuous load.
- Heavy-duty cast iron marine cylinder heads withstand thermal shocks from raw cooling water cycling.
- Marine-grade composite head gaskets resist salt water corrosion between deck cooling passages.
Dyno Test Cell Metrics
Hot test protocols record vital statistics on every DMA1-GTP long block engine before dispatch. The assembly generates 240HP at 4400 RPM alongside 355 ft-lbs torque at 3000 RPM. Oil gallery pressure maintains 55 PSI hot at 190°F oil temperature. Cylinder compression averages 175 PSI with bank variance under 3%. Crankshaft runout checks out at 0.0003in TIR. Dynamic exhaust gas temp reaches 1250°F under dyno loading.
Installation Demands Maintenance Guidelines
Marine throttle cable pull resistance requires 5 lbs force. This marine Windsor unit is NOT built for automotive closed-loop catalytic exhaust systems, opposite-rotation twin-engine passenger crafts, or dry-exhaust tractor setups.
- Change break-in engine oil alongside the spin-on marine filter after 25 water operating hours.
- Adjust hydraulic valvetrain rockers to zero lash plus one-half turn preload during initial setup.
- Inspect raw water circulating pump impeller and brass core plugs after 100 engine hours.
Coverage Terms Crate Manifest
Built under strict ATK Marine assembly standard protocols, this marine powerplant includes a 2-Year limited warranty. Uncrating reveals the rebuilt marine long block core, marine oil pan, timing cover, valve covers, oil pump with screen, and signed dyno verification sheet.
ATK High Performance DMA1-GTP Marine Rebuilt Long Block Engine Specs
| Brand | ATK Marine Engine |
| Engine Model | DMA1-GTP |
| Part Type | Crate Engines |
| Product Line | ATK Marine Rebuilt Long Block Engines |
| UPC | 00653517134913 |
| Crate Engine Family | Ford Windsor |
| Engine Displacement | 5.8L / 351 |
| Cylinder Head Material | Cast Iron |
| Engine Block Material | Cast Iron |
| Assembled | Yes |
| Engine Balance | External |
| Cam Style | Hydraulic Flat Tappet |
| Rear Main Seal Style | 1-piece |
| Intake Manifold Included | No |
| Cylinder Heads Included | Yes |
| Carburetor Included | No |
| Throttle Body Included | No |
| Distributor Included | No |
| Oil Pan Included | No |
| Valve Covers Included | No |
| Timing Cover Included | No |
| Water Pump Included | No |
| Harmonic Balancer Included | No |
| Flexplate Included | No |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plugs Included | No |
| Spark Plug Wires Included | No |
| Computer Included | No |
| Wiring Harness Included | No |
| Supercharger Included | No |
| Warranty Info | 1 Year |
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