8.1 liter
8.1 liter 
Do anyone know if the 8.1L vortec come with a forged crank and pistons 
05-03-2011, 08:47 PM
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From the interwebs:
http://www.nautic-motors.fr/Engines.html
Look's like it was only the boat-moters that got forged crankshafts in the 8.1L. The L21 did get forged crank/pistons however.
The "first" marine 8.1L 496's came with a forged crankshaft... They later changed to a cast crank... Cant remember if it was just on the H.O version or not, but for sure there was a forged steel one made and run in production for the marine engine in the Mercruisers for a while
Look's like it was only the boat-moters that got forged crankshafts in the 8.1L. The L21 did get forged crank/pistons however.
05-04-2011, 11:59 PM
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And? Could it be the OP maybe misheard which motor came with the forged assembly and I was throwing it out as to maybe clear it up for him?
https://ls1tech.com/forums/small-blo...lets-talk.html
There's a good thread thats on this forum even haha.
https://ls1tech.com/forums/small-blo...lets-talk.html
There's a good thread thats on this forum even haha.
05-05-2011, 09:49 PM
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Why buy a 8.1 truck engine?
Its a better idea to get a standard deck height 454 and go from there.
If I am not mistaken the 8.1 is a tall deck block which cost more to build and could cause a lot of problems depending on the car its going in. Just my 2 cents..
As far as it being forged I doubt if they are. Not meant to exceed 6000 rpm so there is no need from the factory.
Are you wanting to build off one or just asking?
Its a better idea to get a standard deck height 454 and go from there.
If I am not mistaken the 8.1 is a tall deck block which cost more to build and could cause a lot of problems depending on the car its going in. Just my 2 cents..
As far as it being forged I doubt if they are. Not meant to exceed 6000 rpm so there is no need from the factory.
Are you wanting to build off one or just asking?
05-05-2011, 09:49 PM
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Why buy a 8.1 truck engine?
Its a better idea to get a standard deck height 454 and go from there.
If I am not mistaken the 8.1 is a tall deck block which cost more to build and could cause a lot of problems depending on the car its going in. Just my 2 cents..
As far as it being forged I doubt if they are. Not meant to exceed 6000 rpm so there is no need from the factory.
Are you wanting to build off one or just asking?
Its a better idea to get a standard deck height 454 and go from there.
If I am not mistaken the 8.1 is a tall deck block which cost more to build and could cause a lot of problems depending on the car its going in. Just my 2 cents..
As far as it being forged I doubt if they are. Not meant to exceed 6000 rpm so there is no need from the factory.
Are you wanting to build off one or just asking?
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05-08-2011, 02:38 PM
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After reading the thread I posted I would stay away from that 8.1L as well.. heck you can even use a Gen 5 block if you can't find a Gen 6. The gaskets for mounting older/newer heads is the same cost as regular ones and it works fine.
