Ron 75 L48

What is the difference between a GM marine engine and a regular GM remanufactured engine? A local company here is asking the same price installed for the GM marine engine that puts out 260hp vs a GM remanufactured engine that puts out 210hp.

Thanks,
Ron

noskillz

The marine is usually set up for low end torque - peaking at around 2,500 - 3,500. If it use external cooling water then it will be galvanized in the water passages.

71coupe

Marine engines are probably the most HD motors you can get. My friend's marine motor has a reverse rotation cam with a two-gear drive instead of a timing chain. ZZ4 blocks have the same p/n as marine blocks.
As far as heads, most marine motors use iron instead of aluminum for corrision resistance.
What are the p/n's of the motors you are looking at?

criz51

Weren't the ZR-1 engines built by Outboard Marine for GM?

Tom73

Do marine engines rotate the other way?

Ganey

The LT-5 ZR-1 engines were built by Mercury Marine.
The marine engine assembly (& balancing) are more tightly controlled.

Todbo

I saw an LT5 in the crate at carslile , just for a second I thought I wonder..... :steering:
But I kept on walking

Ron 75 L48

Is there a disadvantage if I was to go with the marine engine? I understand that it has more lower end torque. Is this correct? If so my guess is that the gas milage would really be bad for cruising the highways around 70 to 75?

MN 72 454

It would probably cruise really well, these engines are made to run at 3000 or so rpm's all day long. It will fall off sharply after 3500. These figures are not exact but thats the general idea. The marine engines are very durable.

Cookwithvette

Some do. It seems that installed in a pair (side by side) they arrange it so one turns one way while the other turns opposite. I have a friend with an older Ski Nautique. Gave a mechanic a real headache one time trying to set the timing before he realized it was reverse rotation. :lol: