
GM 4.3 Marine Engines ATK is a leading manufacturer of marine engines that are made with maximum performance and long term durability in mind. The engines are designed and built specifically for...
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Add to CartWhy buy an ATK Marine Engine? ATK is a leading manufacturer of marine engines. ATK designs engines that are made with performance in mind and long lasting durability is a priority. Marine environments require a different type of engine construction. These engines need to be able to stand the rigors and conditions of marine environments and these ATK GM 5.7 marine engines have you covered. Quality is key with ATK and they take pride in the fact that there are over 150 steps involved in ensuring an engine is ready for resale. There are many steps involved in remanufacturing each ATK engine including the GM 5.7 Marine Engine.
The GM 5.7 Marine Engine has been used in marine applications since 1986 and designed to meet or exceed O.E Specifications. Engine parts are vigorously inspected and tested. The engine blocks and cylinder heads are magnafluxed to determine if there are any cracks. Camshafts bearings are examined to ensure accurate center-to center clearance and precision ground or replaced to maintain the O.E. profile. Pistons and rod assemblies are blanched to minimize engine vibration. Timing belts, chains, and gears are all replaced with new parts.
Testing is key and all ATK engines including the GM 5.7 Marine Engine are run through rigorous testing and quality control processes for compression, oil leaks, unusual engine noise or vibrations, and ensure all parts are in good original working order before shipment. Oil pump, oil pump kit, and installation gasket set are supplied with each engine. Free freight available in the continental U.S.and there is no core charge.
Featured procedures include:
No Core Charge
Free Freight to anywhere in the continental U.S
18 Month No Fault Warranty
Call Customer Service for more details 1-877-388-2628
# | Year | Description | Part # |
1 | 1964-1980 | GM 5.7 / 350/ 260HP 2 pc rear seal, 8.5:1 CR, 2 bolt main, port side dipstick. | ATK-DM01 |
2 | 1964-1980 | GM 5.7 / 350/ 270HP 2 pc rear seal, 9.0:1 CR, 2 bolt main, port side dipstick. Use DM03 for Reverse rotation. | ATK-DM02 |
3 | 1964-1980 | GM 5.7 / 350/ 270HP Reverse rotation, 2 pc rear seal, 9.0:1 CR, 2 bolt main, port side dipstick. Use DM02 for STD rotation | ATK-DM03 |
4 | 1964-1980 | GM 5.7 / 350/ 275HP 4 bolt main, 2 pc rear seal, 9.0:1 CR, 1.94 Intake valve, Flat tappet cam, port side dipstick. | ATK-DM08 |
5 | 1980-1985 | GM 5.7 / 350/ 260HP STD rotation, 2 bolt main, 2 pc rear seal, starboard side dipstick. Valve cover bolts on perimeter. Use DM21 for reverse rotaion Casting number: 909, 979, 776, 777, 371, 778, 535, 551, 627, 058 | ATK-DM20 |
6 | 1980-1985 | GM 5.7 / 350/ 260HP Reverse rotation, 2 bolt main, 2 pc rear seal, starboard side dipstick. Valve cover bolts on perimeter. Use DM20 for standard rotaion Casting number: 909, 979, 776, 777, 371, 778, 535, 551, 627, 058 | ATK-DM21 |
7 | 1986 | GM 5.7 / 350/ 260HP Std rotation, 1pc rear seal, head casting 624, valve cover bolts to perimeter Casting number: 548, 526, 148, 638 | ATK-DM96 |
8 | 1986-1987 | GM 5.7 / 350/ 260HP Standard rotation, 4 bolt main, 1 pc rear seal, valve cover bolts on perimeter. Use DM23 for reverse rotation. Casting number: 245, 379, 010, 014, 678, 388, 618 | ATK-DM22 |
9 | 1986-1987 | GM 5.7 / 350/ 275HP Standard rotation,cam upgrade, 4 bolt main, 1 pc rear seal, valve cover bolts on perimeter. Magnum option, 275hp Casting number: 245, 379, 010, 014, 678, 388, 618 | ATK-DM22CU |
10 | 1986-1987 | GM 5.7 / 350/ 260HP Reverse rotation, 4 bolt main, 1 pc rear seal, valve cover bolts on perimeter. Use DM22 for standard rotation. Casting number: 245, 379, 010, 014, 678, 388, 618 | ATK-DM23 |
11 | 1987-1995 | GM 5.7 / 350/ 260HP 4 bolt main, 1 pc rear seal, flat tappet cam, valve covers bolt thru center, steel front cover. 12 bolt intake. Casting number: 548, 526, 148, 638 | ATK-DMA2 |
12 | 1987-1995 | GM 5.7 / 350/ 275HP Std rotation, Cam upgrade, 4 bolt main, 1 pc rear seal, flat tappet cam, valve covers bolt thru center, steel front cover. 12 bolt intake. Magnum option, 275hp Casting number: 548, 526, 148, 638 | ATK-DMA2CU |
13 | 1987-1995 | GM 5.7 / 350/ 260HP Complete with oil pan, front cover and valve covers installed. 4 bolt main, 1 pc rear seal, flat tappet cam, valve covers bolt thru center, steel front cover. 12 bolt intake. Casting number: 548, 526, 148, 638 | ATK-VMA2 |
14 | 1987-1995 | GM 5.7 / 350/ 260HP Reverse rotation, 4 bolt main, 1 pc rear seal, flat tappet cam, valve covers bolt thru center, steel front cover. 12 bolt intake. Casting number: 548, 526, 148, 638 | ATK-DMA3 |
15 | 1987-1995 | GM 5.7 / 350/ 260HP Reverse rotation,Complete with oil pan, front cover and valve covers installed. 4 bolt main, 1 pc rear seal, flat tappet cam, valve covers bolt thru center, steel front cover. 12 bolt intake. Casting number: 548, 526, 148, 638 | ATK-VMA3 |
16 | 1996-2005 | GM 5.7 / 350/ 260HP Complete with oil pan, front cover and valve covers installed. 4 bolt main, 1 pc rear seal,Roller cam, valve covers bolt thru center, plastic front cover w/ crank sensor hole. 8 bolt intake. Electric fuel pump Casting number: 880 | ATK-VMM9 |
17 | 1996-2005 | GM 5.7 / 350/260HP Complete with oil pan, front cover and valve covers installed. 4 bolt main, 1 pc rear seal,Roller cam, valve covers bolt thru center, plastic front cover w/o crank sensor hole. 8 bolt intake. Electric fuel pump Casting number: 880 | ATK-VMM9S |
18 | 1996-2005 | GM 5.7 / 350/260HP 4 bolt main, 1 pc rear seal, Roller cam, 8 bolt intake, electric fuel pump. Casting number: 880 | ATK-DMM9 |
19 | 1996-2006 | GM 5.7 / 350/ 260HP Std rotation, 4 bolt main, roller cam, steel roller tip rockers, valve covers bolt thru center, plastic front cover. Head casting 906 or 062. Casting number: 880 | ATK-DMM9ST |
20 | 1996-2005 | GM 5.7 /350/ 275HP Std rotation, Cam upgrade, 4 bolt main, 1 pc rear seal, Roller cam, 8 bolt intake, electric fuel pump. Magnum option, 275hp Casting number: 880 | ATK-DMM9CU |
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