What engine in new boat

[QBhoy]

Hi everyone, picked up a 2004 Larson 210LXi.

Trying to figure out what engine is in it. Was told it was 5.0. It runs very well on water. I can't find any markings, but it does have a 4bbl Edelbrock. When would I 5.0 come with this carb? Could it actually be a 350?

looks like an aftermarket repower 5.7 to me. One that’s had a VP shiny red paint job to suit. The carb and ignition system parts (like the diz) also add reason to my thinking. I’d almost bet my life that there is black paint to be found under that shiny red

 

[jimmbo]

VP would have had put a 2bbl 500CFM(370cfm when flow rated like a 4bbl)Holley, which was Perfectly sized for a 5 liter spinning 5000. However on a 5.7 it was a bit too small. They did put a very nice 4bbl Intake under it though.
There is a noticeable difference in Torque between a 5 liter and a 5.7. a 5 liter in a 21 foot, would be slow out of the hole.

 

[Yz229]

looks like an aftermarket repower 5.7 to me. One that’s had a VP shiny red paint job to suit. The carb and ignition system parts (like the diz) also add reason to my thinking. I’d almost bet my life that there is black paint to be found under that shiny red

Why do you think that about the diz? New to the marine engines.

 

[Yz229]

VP would have had put a 2bbl 500CFM(370cfm when flow rated like a 4bbl)Holley, which was Perfectly sized for a 5 liter spinning 5000. However on a 5.7 it was a bit too small. They did put a very nice 4bbl Intake under it though.
There is a noticeable difference in Torque between a 5 liter and a 5.7. a 5 liter in a 21 foot, would be slow out of the hole.

It's pretty quick out of the hole, which makes more sense now that I know it's a 5.7. I may be a bit underpropped as well. Topped out at 47-48mph GPS at 5,000RPM. Full tank of fuel, 4 adults, 3 kids and a bunch of coolers.

 

[QBhoy]

Why do you think that about the diz? New to the marine engines.

Just maybe because it’s maybe not what’s usually found on a VP like that, of that era, from new perhaps. Could be wrong. Not saying what you have is in anyway a bad thing at all. Just some observations perhaps. Hope you enjoy her either way. That’s what it’s all about after all. If she is a vortec repower 350 engine…these can produce anything from 260-300hp depending on the carb she has. I know of a few that have been improved by a good ignition system. Know of a pair in particular that came with delco parts then since changed and vastly improved by fitting petronix system.

 

[Yz229]

Trying to identify the heads, I'm pretty certain they are the "906" Vortec heads. The heads on my boat have a large single hump, instead of a sawtooth pattern that the "062" would have. And the 5.0 would have a square instead of a hump.

https://www.crankshaftcoalition.com/wiki/SBC_cylinder_head_identification#Vortec_L30_5.0L_305_head_casting_number_12558059

 

[Scott Danforth]

You're prop'd fine

 

[Scott Danforth]

Trying to identify the heads, I'm pretty certain they are the "906" Vortec heads. The heads on my boat have a large single hump, instead of a sawtooth pattern that the "062" would have. And the 5.0 would have a square instead of a hump.

Pull the valve cover and look at the casting number if it bothers you to know which one of the two casting numbers you have

 

[Scott06]

carb has been swapped. Volvo uses Holley. that is an edelbrock (aftermarket)

That is not a marine edlebrock carb. it is an automotive. the marine does not have the three vacuum ports on front ...also doesnt have an overflow nipple up by airhorn.

To the OP get a marine edlebrock 1409 is 600 cfm and will work on a 5.0, if it is a 5.7 might think about the 1410 750 cfm, not sure which would be better for 5.7

 

[jimmbo]

I used the Holley 650 Spreadbore on a 5.7, more than enough, by quite a bit, for a 5.7 spinning 5000. The Holley 2bbl500(370 when flow rated like a 4bbl) is pretty much Perfect for a 5 liter. A 600 would barely crack the Secondairies

Holley 0-80552 650 CFM Spreadbore Marine Carburetor

All Holley Marine Carburetors are designed to meet Coast Guard specifications. A marine carburetors fuel metering system is calibrated to compensate for unique engine loads found on boats. The J-style vent tubes direct fuel/fumes back into the carburetor for safe operation while on rough...

www.holley.com

I wouldn't touch a Carter/Weber/Edelbrock even if a Gun was put to my Head

 

[Scott06]

I use the Holley 650 Spreadbore on a 5.7, more than enough, by quite a bit, for a 5.7 spinning 5000. The Holley 2bbl500(370 when flow rated like a 4bbl) is pretty much Perfect for a 5 liter. A 600 would barely crack the Secondairies

That's what I thought. Years ago I thought michigan motorz and marine power were both using 600 cfm on their 5.7 partial engine packages, but I saw Merc uses a 750 on their reman 5.7 engines...

Either way the OP has a Automotive carb

 

[jimmbo]

If an engine was equiped with a Q-Jet, it would be misconstrued that even a 307 needed 750 cfm, which is what the small Q-Jet could flow at full capacity
Merc also used a very poor Adapter to mount a Squarebore Carb on a Spreadbore intake. The Primaries on the Carb were larger than holes in the Intake. Not good. At least VP actually put a Good 4bbl Intake on their motors, even if they were sticking the Holley 2bbl on them

Maybe Merc is expecting a lot of those engine to be raced, in Stock Classes

 

[Scott Danforth]

my VP AQ275 came with a 715CFM holley 4150

VP put 600 CFM on the 4.3 and 500 CFM Holley 2300's on the 3.0

 

[Lou C]

I used the Holley 650 Spreadbore on a 5.7, more than enough, by quite a bit, for a 5.7 spinning 5000. The Holley 2bbl500(370 when flow rated like a 4bbl) is pretty much Perfect for a 5 liter. A 600 would barely crack the Secondairies

Holley 0-80552 650 CFM Spreadbore Marine Carburetor

All Holley Marine Carburetors are designed to meet Coast Guard specifications. A marine carburetors fuel metering system is calibrated to compensate for unique engine loads found on boats. The J-style vent tubes direct fuel/fumes back into the carburetor for safe operation while on rough...

www.holley.com

I wouldn't touch a Carter/Weber/Edelbrock even if a Gun was put to my Head

Just curious what’s the bad with Edelbrock? I only have experience with Quadrajet & Holley….

 

[jimmbo]

My 5.7 came with the 500cfm(370 when flowed like a 4bbl) 2bbl. It was too small as I was seeing about 4.5 - 5" of Vacuum at WOT. With the 650 it was 1.0" the Secondaries weren't fully open, but it didn't need all 650cfm a 5.7 spinning 5000 isn't going to use more than 415cfm at 80% VE
Gained a little over 5mph when I put the 650 on the 5.7, which put me in the upper 60s

As for Carter Carbs, I just don't like them. My favs are the Q-Jet, because though it is hard to change any of the Bleeds, it still can be used in many apps, on many Engines. It is really an Almost 'Fits' any Engine,.
Next is the Holley, which are easy to tune for Power or Economy, but no so easy to get both at once, unless you are willing to do some Butchering.

 

[Scott06]

Just curious what’s the bad with Edelbrock? I only have experience with Quadrajet & Holley….

Nothing is bad with an edelbrock you will hear peoples preferences

 

[Yz229]

It runs very well with the Edelbrock, so probably won't mess with it for now. Was never a fan of Edelbrock carbs at all, especially on 4x4 trucks. Any roll and they flood. Was a fan of the Q-jet for that reason, almost ran like fuel injection.

 

[Lou C]

If it isn't a marine carb, I would change it for one that is and sell the one that's on there. Not only that, I'd check all the other electrical equipment to make sure it meets the J1171 specification for use in an enclosed engine compartment in a gas inboard. This is no joke, using automotive carbs and electrical equipment can be deadly in a gas inboard. Nothing to fool around with!

 

[Yz229]

If it isn't a marine carb, I would change it for one that is and sell the one that's on there. Not only that, I'd check all the other electrical equipment to make sure it meets the J1171 specification for use in an enclosed engine compartment in a gas inboard. This is no joke, using automotive carbs and electrical equipment can be deadly in a gas inboard. Nothing to fool around with!

I just looked and it's a 1406. Bummer! Now I need to decide if I want to buy a 1409 or something else.

 

[Lou C]

IF whoever put this thing together used an automotive carb on a boat, I would not trust anything else they did. Check the alternator, distributor, and starter for J1171 certification labels. All must be spark protected to prevent a explosion if gas vapor is present in the bilge.