Chevy 305, 350/383

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wameyer

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Jul 8, 2010
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Ok this is kind of a long post post but here it goes. My brother and I decided to get rid of our Mercury 200 outboard and put an I/O in because we had to replace our stringers and transom. We bought a '77 searay SRV 195 to get everything we needed. The guy told us it had a 305 in it with a corvette 350 spare engine. The 305 had the heads off (and did not come with them) and you could see rust on a few of the cylinders. When I was taking the "305" apart I noticed a tag on the side of the motor that had CHV 383 on the bottom of the tag and it had mains as .60 and a few other markings ( I can get them if need be ) I need to figure out what I exactly have.

The 350 has a 2 bolt main
The 305 or 383 has 4 bolt

We want to have the same speed as our 200 Mercury outboard had. Our boat is a 25' glasstream eagle 2500.
What would be best to put in and would the 350 heads work on the 305/383 or would it be best to put the 350 in. I could hone the 305/383 to bring back the cylinders.

Thank you for all your input.
 
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Pete104

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Re: Chevy 305, 350/383

Go to the "sticky's"! There is a link to GM engine ID. You'll find what ever it is you have.
 
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wameyer

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Re: Chevy 305, 350/383

I click on the sticky and under mercruiser I.D. it says page not found
 
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Pete104

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Re: Chevy 305, 350/383

It's there! There is another link further down on that same page. www.marinemechanic.com
It's not all that easy to navigate. You'll have to do some reading but there is alot of info.
 
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wameyer

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Jul 8, 2010
Messages
57
Re: Chevy 305, 350/383

Trying to get HP numbers
I finally figured out that I have a 350 block with a 350 crank. It has 60 over pistons
Bore=4.060
The tag on the side of the block states CHE 383 so the stroke would have to be 3.700
I have 5.7" rods
I am curious about what HP numbers I could see from this motor. I have a Alpha 1 drive and after my brother and I put a new transom in our boat I know it will be rated for over the stock 250 HP from the glasstream. Really dont want to buy a Bravo drive but I really dont want to be stranded on the lake with anchor attached to our stern.

With all the research on the two motors that we have it feels like I am becoming an expert on the blocks and casting numbers still learning though glad everyone is helping me out.

Thank you for all the expertise it is greatly appreciated.
 
T

telstar1

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Jun 20, 2008
Messages
226
Re: Chevy 305, 350/383

Seems to me you should Measure the stroke ie by rolling engine ove 1 turn,see how far piston travels.Thats if youre not positive youve got a 383.
 
Bondo

Bondo

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70,513
Re: Chevy 305, 350/383

I am curious about what HP numbers I could see from this motor. I have a Alpha 1 drive
Click to expand...

Ayuh,.... I'd think you'd find a 3.75" stroke,...
The Horsepower would be determined by the Complete package used,...
Pistons, heads, cam, etc...

The 300hp limit of the Alpha is a pretty Tame stroker motor...
The more ya build beyond that means ya gotta be mindfull of yer righthand,....;)
 
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wameyer

Seaman
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Jul 8, 2010
Messages
57
Re: Chevy 305, 350/383

ok, thank you very much, Bond-o quick question for you, I have another post where I have like a double keel on my boat Here is the link could you help enlighten me and would a bravo drive fix that issue or what
 
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steve1969

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Jul 1, 2011
Messages
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Re: Chevy 305, 350/383

Hey, I just bought a 82 oliver with a 485 mercrusier. Im having a problem with it stalling out. The power trim "up" doesn't work but "down" and "trailer" work. The trim indicator is pinned.
My question is "can a faulty trim limit switch" cause the engine to stall?
 
Bondo

Bondo

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Re: Chevy 305, 350/383

steve1969 said:
Hey, I just bought a 82 oliver with a 485 mercrusier. Im having a problem with it stalling out. The power trim "up" doesn't work but "down" and "trailer" work. The trim indicator is pinned.
My question is "can a faulty trim limit switch" cause the engine to stall?
Click to expand...

Ayuh,.... Good fer You,... Welcome Aboard,...

How about ya start a thread of yer Own, insteada hy-jackin' wameyer's here...

Thank you...
 
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wameyer

Seaman
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Jul 8, 2010
Messages
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Re: Chevy 305, 350/383

I have done alot of reading of how a marine engine is different from an automotive engine, but would it hurt to leave all the automotive parts on since I am running my boat in fresh water? The biggie I found was dont use aluminum and use brass freeze plugs. I know starters, alternators and carbs are alittle different. I know I need to put studs on the end of the crank for the flywheel vs. the bolts. The motors that I got with the one parts boat I took them apart and could not find a difference except 4 bolt vs 2 bolt and a windage tray. The cams were the same.

I am getting a free chevy 305
 
Bondo

Bondo

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Re: Chevy 305, 350/383

but would it hurt to leave all the automotive parts on since I am running my boat in fresh water?
Click to expand...

Ayuh,... Which parts,..?? Specifically,...
 
W

wameyer

Seaman
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Jul 8, 2010
Messages
57
Re: Chevy 305, 350/383

freeze plugs, crank, pistons, cam, intake, heads, I received the motor without a carb, starter, alternator, which I know are different.
 
BoatingCop

BoatingCop

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Aug 28, 2007
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407
Re: Chevy 305, 350/383

A marine carb, starter, and alternator are a MUST! As far as the other stuff, I'm not sure
 
picklenjim

picklenjim

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Mar 11, 2009
Messages
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Re: Chevy 305, 350/383

No need for studs on the crank for the flywheel. Never seen that before. You will want to use a cam shaft designed for low end rpm power. Comp cams offer several marine cams. Check Summit.
 
G

gwhitten

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Jul 26, 2009
Messages
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Re: Chevy 305, 350/383

wameyer said:
freeze plugs, crank, pistons, cam, intake, heads, I received the motor without a carb, starter, alternator, which I know are different.
Click to expand...

Would strongly recommend replacing the freeze plugs. Unlike an automotive application where the coolant contains rust inhibitors, you are passing freshwater continuously by the plugs. They will corrode over time. When they fail, you will have a big water pump that will pump water into the boat!!! I speak from experience on this one. I have an '84 Ebko with a 228 sterndrive (originally 305 CID) that was repowered by the previous owner with a Chevy 350 truck engine...without changing the freezeplugs.
Brass plugs are available at NAPA and easily installed. You just drill a hole in the old plugs and pull them out.
 
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