New 4.3L Vortec Marine Extended Base Engine with Exhaust (replaces years 1996-2007)

New 4.3L Vortec Marine Base Engine (replaces years 1996-2007)

This is a brand new 4.3L/262 c.i. Vortec Marine Base Engine right out of GM Marine. This engine will replace those 4.3L marine engines used in Mercruiser, Volvo Penta, OMC, Crusader, Indmar and other applications between the years 1996-2007.

This is a perfect stock replacement for those engines that have suffered from a cracked block due to improper winterization or another type of engine failure.

This "Base Engine" Package includes:

• new engine block, heads and all internal components
• valve covers
• composite (plastic) timing cover
• oil pan
• harmonic balancer
• circulation/water pump
• 2bbl cast iron or 4bbl cast iron 8-bolt intake manifold
• 2bbl or 4bbl marine carburetor
• Delco Voyager ignition system
• flame arrestor
• 14" I/O marine flywheel
• exhaust manifolds & risers (many options available - select from dropdown when ordering)

How do I know if I have dry joint exhaust manifolds and risers?:

• Your engine is newer than 2001 (Mercruiser went with the dry joint style starting in 2002)
• Your riser has two "elbows" that come out the side of the riser, as shown here
• Picture showing difference between non-dry joint and dry joint, click here

Specifications:

• 1 Piece Rear Main Seal
• Standard rotation
• Intake Manifold: 8 bolt
• Cylinders: 90 Degree V6 Cylinder
• Composition Ratio: 9:4:1
• Bore: Standard
• Firing Order: 1-6-5-4-3-2
• Oil Pan Capacity: 4.5 quarts
• Oil Type: SAE 15W40 Pennzoil Marine
• Horsepower: 223 hp @ 4800 RPM (4bbl carbureted)
• Torque: 267 lb-ft @ 2800 RPM

ABOUT OUR MARINE BASE ENGINES

NEW MARINE ENGINES 4 LESS UNITS

Beginning in 2015, GM has begun to discontinue many of their marine engines. This includes the 3.0L and 4.3L in 2015, the 5.0L in 2016, and the 7.4L and 8.2L in 2022. To date (March 2023), GM only produces the Vortec 5.7L marine engine. Because of this, we began producing our own new units in 2021. These new units use DART’s performance engine blocks and are machined, assembled and tested in our facility. They are built to GM factory specifications and there will be no issues to use these units in place of GM MPI or TBI units.

Similarly, in 2023 Mercruiser’s “Quicksilver” branded engines will begin to use new DART blocks as well, as GM has discontinued and stopped providing new engines to Mercruiser.

The benefit of using our in house produced units using DART engine blocks include:

• Priority main oiling system feeds main bearings first. See Figure 1.
• Siamese cylinder bores with extra thick walls resist cracking and improve ring seal for more power (minimum .275” thick with 4.185” bore).
• Open lifter valley improves oil return to pan.
• Blind head bolt holes don’t go through to water jacket.
• Billet steel 4-bolt main bearing caps on all 5 mains.

Figure 1: Priority main oiling primes the main bearings first and then to the lifters and top end instead of top down oil priming in OEM blocks allowing for peak performance at high temperatures.