Looking for Long Block Merc V8 230, 305, 4 bbl
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- Lieutenant
- Posts: 35
- Joined: Wed Jan 22, 2020 8:23 pm
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Looking for Long Block Merc V8 230, 305, 4 bbl
Does anyone have any good recommendations for where to find one of these. My block cracked in the recent cold freeze.
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
If I were replacing that motor, I would consider replacing with a 350 depending on if your current motor is carbed or fuel injected. If it's carbed, easy peasy. With fuel injection, more work to get it converted.
What year is your motor? Makes a difference sometimes because of the interface to the drive if its a one or two piece rear seal.
Also, WAY easier finding 350s
Michign Motorz is one place. https://www.michiganmotorz.com/
What year is your motor? Makes a difference sometimes because of the interface to the drive if its a one or two piece rear seal.
Also, WAY easier finding 350s
Michign Motorz is one place. https://www.michiganmotorz.com/
2017 R5 350HP Mercruiser Bravo III
Northridge, CA
Big Bear Lake, CA
South Lake Tahoe, CA
Northridge, CA
Big Bear Lake, CA
South Lake Tahoe, CA
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- Lieutenant
- Posts: 35
- Joined: Wed Jan 22, 2020 8:23 pm
- Contact:
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
My engine is 1983 model so not sure , has anyone had any luck trying to weld it back together
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- Captain
- Posts: 250
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Re: Looking for Long Block Merc V8 230, 305, 4 bbl
Welding cast is tough. Preheat/postheat, prep, etc. Not to mention access to get to the crack. Check your local shops to see if you can find one interested.
2012 A25
Volvo 8.1 400hp
Volvo 8.1 400hp
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
I'm not speaking from any real sense of authority of confirmed knowledge here, but I was thinking, why not just use a Chevy Truck long block (or even short block if you are capable) and bolt on your marine components. After my preliminary thought, I did some digging and found this thread - https://forums.iboats.com/threads/diffe ... ck.170603/
I would say with the lower level of investment in your boat, that just might be your best - including from value - solution.
Also - There is a rebuilt (remanufactured) 305 Mercruiser Long Block on EBay right now for $3600 (as well as a few used complete engines)
I would say with the lower level of investment in your boat, that just might be your best - including from value - solution.
Also - There is a rebuilt (remanufactured) 305 Mercruiser Long Block on EBay right now for $3600 (as well as a few used complete engines)
2006 Cobalt 232
Volvo Penta 8.1L OSi
Key Pensinsula, Washington
Volvo Penta 8.1L OSi
Key Pensinsula, Washington
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
You need an engine with a 2 piece rear main seal.andymoler58 wrote: ↑Mon Feb 20, 2023 7:39 pm My engine is 1983 model so not sure , has anyone had any luck trying to weld it back together
2017 R5 350HP Mercruiser Bravo III
Northridge, CA
Big Bear Lake, CA
South Lake Tahoe, CA
Northridge, CA
Big Bear Lake, CA
South Lake Tahoe, CA
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
The problem is, he is going to have to find a truck block 1986 or older because of his 2 piece rear seal. Even if he finds one, it will have to be rebuilt. Best to just buy a rebuilt block.DEcosse wrote: ↑Tue Feb 21, 2023 1:14 am I'm not speaking from any real sense of authority of confirmed knowledge here, but I was thinking, why not just use a Chevy Truck long block (or even short block if you are capable) and bolt on your marine components. After my preliminary thought, I did some digging and found this thread - https://forums.iboats.com/threads/diffe ... ck.170603/
I would say with the lower level of investment in your boat, that just might be your best - including from value - solution.
Also - There is a rebuilt (remanufactured) 305 Mercruiser Long Block on EBay right now for $3600 (as well as a few used complete engines)
2017 R5 350HP Mercruiser Bravo III
Northridge, CA
Big Bear Lake, CA
South Lake Tahoe, CA
Northridge, CA
Big Bear Lake, CA
South Lake Tahoe, CA
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
Well sure, that's what I'm saying - just that he should consider a Truck Block vs a "mercruiser' one (although there are also 'marine' rebuilt long blocks on Ebay also, but most I've looked at with that designation are 'reverse')
I didn't look closely enough at the Mercruiser one I referenced above, yes that one is single seal but main point I was making was actually to consider truck engine
2006 Cobalt 232
Volvo Penta 8.1L OSi
Key Pensinsula, Washington
Volvo Penta 8.1L OSi
Key Pensinsula, Washington
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
Maybe this - https://www.ebay.com/itm/251091488821?h ... Swc6pZ8iUH
I have no personal experience of that particular re-builder but they do have warranty and also some configurable extras if desired and reasonably priced
Or these guys - https://www.ebay.com/itm/264436283426? - much better warranty (3 yrs) and much better feedback rating
I have no personal experience of that particular re-builder but they do have warranty and also some configurable extras if desired and reasonably priced
Or these guys - https://www.ebay.com/itm/264436283426? - much better warranty (3 yrs) and much better feedback rating
2006 Cobalt 232
Volvo Penta 8.1L OSi
Key Pensinsula, Washington
Volvo Penta 8.1L OSi
Key Pensinsula, Washington
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
Like I said, you will have to find a truck engine from a truck 1986 or older. Such a truck won't have 50K on the engine, and if it does, it will have been sitting around 30 + years and will have to be rebuilt anyway.DEcosse wrote: ↑Wed Feb 22, 2023 12:58 pmWell sure, that's what I'm saying - just that he should consider a Truck Block vs a "mercruiser' one (although there are also 'marine' rebuilt long blocks on Ebay also, but most I've looked at with that designation are 'reverse')
I didn't look closely enough at the Mercruiser one I referenced above, yes that one is single seal but main point I was making was actually to consider truck engine
You don't have to buy a "mercruiser" engine...any rebuilt 305 or 350 will be fine as long as it's a two piece rear main seal.
An engine out of a truck would have to have it's heads removed at minimum to have the metal head gasket replaced and you would have to replace all the core plugs.
Better to buy a rebuilt motor.
2017 R5 350HP Mercruiser Bravo III
Northridge, CA
Big Bear Lake, CA
South Lake Tahoe, CA
Northridge, CA
Big Bear Lake, CA
South Lake Tahoe, CA
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
I'm not saying anything different - never suggested anywhere that he buy a used truck engine
2006 Cobalt 232
Volvo Penta 8.1L OSi
Key Pensinsula, Washington
Volvo Penta 8.1L OSi
Key Pensinsula, Washington
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
Well there is no such thing as a Mercruiser 305 or 350 block since Mercruiser doesn't make 305 or 350 blocks.
If he buys a rebuilt "truck block", as you keep on saying, he has to change out the head gaskets, water pump and casting plugs.
2017 R5 350HP Mercruiser Bravo III
Northridge, CA
Big Bear Lake, CA
South Lake Tahoe, CA
Northridge, CA
Big Bear Lake, CA
South Lake Tahoe, CA
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
You don't mention what boat that is in, only reason I ask is because if this is more of a project boat then I might gamble with a used or rebuilt motor from an unknown source. If this is your relatively new "I use it boat" that justifies a little more $$, then I would personally look for a long block (assuming your manifolds, and other components are good and you can either install it yourself or have someone who can) from a reputable rebuilder like Michigan Motorz or Jasper. The other option is to drop in a crate motor which should be ready to run, but of course there is a cost involved - if you get to this point MerCruiser sells rebuilt replacement engines.
Also, check your insurance, it could be covered.
Also, check your insurance, it could be covered.
______________________________
2014 Cobalt R5 - Current
1999 SeaRay 185 Bowrider -Previous
2000 SeaRay 290 SunDancer - Previous
1979 Correct Craft Ski-Tique - Previous
1948 Chris Craft Custom Runabout - Oh man to have that one back!
2014 Cobalt R5 - Current
1999 SeaRay 185 Bowrider -Previous
2000 SeaRay 290 SunDancer - Previous
1979 Correct Craft Ski-Tique - Previous
1948 Chris Craft Custom Runabout - Oh man to have that one back!
Re: Looking for Long Block Merc V8 230, 305, 4 bbl
Good point on insurance check with them. On my old boat my out drive blew and was getting ready to pay for the repairs and someone recommended to check with insurance. To my pleasant surprise it was covered minus deductible !
- Dudley67
- Captain
- Posts: 425
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- Location: Neely Henry Lake, Alabama
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Re: Looking for Long Block Merc V8 230, 305, 4 bbl
There are plenty of these Mercruiser engines listed on Facebook marketplace. Around 1979, Cobalt switched from the 302 and 351 cu in motors, which were Ford based, to 305 and 350 cu in motors, which are GM based.
These GM based Mercruiser motors are readily available out there. Don’t know where the OP is located or uses FB…. But dozens are out on the market.
These GM based Mercruiser motors are readily available out there. Don’t know where the OP is located or uses FB…. But dozens are out on the market.
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Current:
2016 Marker One ML4
“Looney toon”
1975 18TH
“Phoenix”
Past:
2001 226
1989 19BR
2007 252
1992 222 Condurre
2016 Marker One ML4
“Looney toon”
1975 18TH
“Phoenix”
Past:
2001 226
1989 19BR
2007 252
1992 222 Condurre
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