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stano

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"I am a former empolyee at a G

"I am a former empolyee at a GM dealership. My question is, is there any reason an auto engine can not be used in a marine application. GM preformance engines state not for marine applications? I want to replace my Volvo 305 with a 350. Seem odd to me. Help someone out there tell me the differences!! Thanks"
 
"No. No reason at all. Go for

"No. No reason at all. Go for it.

They just say that so they can charge more for the parts.

If you worked for GM then you know it's like when a guy brings his Vette in for repair and it cost twice as much for the same part that fits a Belair just because it's going on a Vette.

It'll be fine.
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"A few reasons [b]<u>not</u>[/

"A few reasons <u>not</u> to use a car engine include that the camshaft is designed for speed and not for torque (you would need to use a marine camshaft, for is you use a car camshaft you won't have the necessary torque when you need it); the heads are different (even if automotive heads will work, you want to use stainless valves in any case); the distributor is different (marine engines do not have vacuum advance, and the mechanical advance curve is different); the starter is different; the alternator is different; the carb is different; the fuel pump is different; and a few more etceteras."
 
"Bozo, unfortunatly, it's

"Bozo, unfortunatly, it's Bozos like you that feed people bad information and people get hurt. Please, do some more homework before giving bad advice like this.

Everything El Pescador said is correct, but what he did not emphasize is the reason for many of the differences. Besides the performance differences, there are safety reasons many of these parts are different. The marine electrical components are spark supressed. This means they will not go boom when captive in an engineroom filled with fuel vapor caused by a flooded carb with no overflow protection of a fuel pump with no recovery line.

Yes, the basic engine is the same and with some modifications is interchangable, but don't get the impression that you can just drop your Vette motor in your boat and bo boating. There is a reason the Coast Guard regulates these types of things.

Uninformed people are injured and killed every year in boating accidents for the very reasons we are discussing. "Safe boating is no accident", it's also an educated boater.

Rick"
 
"Sorry Boy's but you must

"Sorry Boy's but you must be thinking of a time when buying a marine engine ment something.

Just like buying a truck did.

I agree there was a time that there was not much in a marine engine that was the same as an every day automobile engine.

There was never anything much different in a high performance car engine and a marine engine.

You think the old fuel injected Vetts had less of an engine than an old Chris Craft?

A high performance car engine is every bit as strong as a marine engine.


Other than stainless gaskets and a different grind on the cam I doubt there is anything much different on todays marine engine from a high performance car engine.

The car engine is most likley built better if anything than the crap put out by the marine business these days for the low end buyer.

The days of 4 bolt mains and steel cranks in marine engines are long gone. Just as they are from the truck line.
There was a time that when someone bought a truck 1/2 ton or over it had a steel crank along with 4 bolt mains so it would hold up. Just as marine engines did.

So if you guys are still under the impression that a marine engine is some how better than a high output car engine you better come on into the 21 century.

Granted the parts on the out side are different like the distributor and alternator but this guy was not asking about those parts now was he.
Depending on the engine ordered it may even use the same cam grind.
So, you think it is it worth $2000. more if all it needs is the head and intake gaskets and maybe the cam changed eh? Oh yes and those very expensive brass freeze plugs as well.
I aslo would like to know what you think is so different inside a marine engine.

What you think a marine engine is built tougher than a 350hp car engine that can spin 6500rpm? Come on now."
 
"You still don't get it.

"You still don't get it. Please reread the original question, then read your reply. You are encouraging this guy to do something that is going to put him and his family at risk. That's the bottom line."
 
Thanks for the info. I was pla

Thanks for the info. I was planning on using the engine hard parts only and swap all the electrical parts from boat. I will use a four barrel marine holly carb. Only really new part? Is stainless steel valves needed in new heads? Also I was planning on changing to a marine roller cam. Again thanks for ALL of thr info!!!
 
.."The days of 4 bolt main

.."The days of 4 bolt mains and steel cranks in marine engines are long gone. "

Not at Crusader! That's all they use for their higher performance engines (unlike Mercruiser).

Jeff
 
"That's also what my 350 h

"That's also what my 350 has, and I wouldn't settle for anything less.
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"<u><font color=""aa00aa""><fo

"<u><font color=""aa00aa""><font size=""+1""> guys your all forgetting one thing. the piston skirts are longer on a marine engine. to help with lube & and heat transfir
good luck</font></font></u>"
 
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