sutphen 30

w/ the dart block,,isn't 700ci possible,,if I remember correctly.

PARASAIL941

Sorry , I meant specs. And not me or my torque wrench. Fact says 22ft lbs first pass , 22lbs plus 120 deg second pass , third pass 60 deg long bolts, 45 deg med bolts , 30 deg short bolts . A little different than Gen 4,5,6.

Keith Atlanta

Damn you! Why did you have to bring that up!

The DART block came out right after I built mine and once I realized they offered it in huge bores I was pissed. For hte cost it would have been worth it too... I guess the spending has to stop somewhere...

Keith Atlanta

They are TTY bolts (Torque To Yield)

I replaced mine with ARP and torqued them to conventional specs.

BUP

iTrader: (9)

Just saying to take this a step further Marine OEM the 496 was the heaviest and biggest production engine thrown in a boat. Also I am a huge fan of big block power if done right. The fact of the matter for the average boater who boats with any big block again stock power average boater the horsepower in their app is less than 1 hp per cubic inch and way less . Hell look at what the 4 banger auto guy has like 2 to 4 hp per cubic inch.

Next Volvo Penta before deciding on whether to do a big block when the 496 went away in 2010 - Volvo did many tests and came out with the 6.0 LS. In Volvo testing their stock 6.0 LS smoked the stock 375 hp and the 425hp - 496 apples to apples testing in everything from planning to a drag race. Just saying. In stock form the 496 is not no power house period.

Volvo penta new 5.3 L direct injection engine 350 hp apples to apples in a 24 / 25 boat will smoke a 375 hp 496 - 8.1 L and would give the 425 hp a run for its money. Volvo new 5.3 L direct injection is a power house production marine engine and over 1 hp per cubic inch about darn time someone did this in the I/O market place.

Vortec Bandit

I work with powered boats all day long. The 8.1,s in a 30 to 36 foot cruiser will blow the socks off of the 6L getting on plane. Add 6 to 8 people and it shows that much more. I like the 6L but it has nowhere near the torque and get up and go as the 8.1.

Knot 4 Me

^^^^ The one plus of the 496 MAG/MAG HO is the torque. 500 ft. lbs. +. My single engine boat is 6K lbs. and it planes in no time with a 496 MAG/Bravo III. Now, you get above 4K RPM and the motor starts to show its weaknesses but they are great to get big, heavy boats moving.

donzi matt

iTrader: (1)

I get that BUP isn't a huge fan of the 496, but I certainly am not going to repower my Cig to an LS. As far as large displacement and low output, the 502 Mag was 6 cubes larger and 10 horse less, so the 8.1 did alright filling the gap that was left when Merc replaced it. A quick google search shows a 502 at 1189 lbs with a bravo one drive, and a 496 at 1199 with a bravo one. I am assuming the 10 pounds could be from the closed cooling components.

To realign this thread, I currently have a pair of running 496's and a spare 496 truck long block. I can't afford to buy a twin step Top Gun for a number of years at this point and I really like my boat, it's just a little on the slow side. About 600 horsepower should get me close to where I want to be, I am just trying to figure out the best way to get there. I would prefer to use what I have instead of selling off known good motors to buy unknown motors, not to mention that I wouldn't need to do much in the way of re-rigging if I stick with the Gen 7 motors.

Keith Atlanta

The only difference in the truck block (that I found) was that all bolts were metric except the bellhousing was SAE. Weird, but just an FYI before you try to put a grade 8 in there and get pizzed off.

BUP

iTrader: (9)

I realize the torque of the 496 and if you notice I said in a 24 to 25 ft boats for the average boater. Never mentioned anything about 30 or higher ft boats. Like I said its a heavy engine compared to whats out on the market place currently and the largest gas side production engine thrown into a boat. I own a 496 in a 2007 - 28 ft boat myself. I like the low end and mid range of the stock 496 but top end is a dog. IMO if I had a choice I would rather have a 502 because there is so much more in the market place and engineering done for the end user to buy and play with. Just saying.

Also many boat builders installed the 496 during its timeframe in the market place but in a very poor manner. Especially mid level bot builders and down.

And I have worked on 496's since the day they came out in 2001 model year and being a new boat dealer for many years. Also in my day ( @ one timeframe) and the 496 my shop worked on close to 200 - 496's per year. Merc & Volvo combined, so how can I not like them.

This year I have worked on only 25 - 496's. That's it.

For a NON CAT engine they are one of the hardest engine's to work on in a boat. Access is the main problem. Wiring harnesses is the other problem. Then related fuel issues especially Gen III cool fuel along with its poor design plus does not drain water very well for winterization and then a poor designed IAC operation and then a poor quality Gen VII water pump housing. . I am talking about stock OEM apps here