25 Responses to “Marine Power Marine Engine 8.1L MPI Inboard”
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that is one giant motor
The 8.1 is built off of a modified Chevy 454 (7.4) block, so it should be fairly easy.
NO the 8.1L is NOT built off a modified 454. Nothing internal or external from a 454 will work on a 8.1L. (other than the bell-housing) Two totally different motors. The only common thing is both engines are built via GM.
now thats chevy power!!!!!
hey all,im a new boat owner now with a 30″ scarab 1986,with 2 big block chevys,anyone here familiar with this monster?
@michiganmotorz2008
best engine sound on youtube
just the engines torque might flip the boat
XP
@urbex2007 my 2001 Silverado 2500HD 4×4 has the 8.1 with a 6 speed manual behind it, hard to find but they are out there.
WTF 8.1 litres. It must drink petrol. Seriously.
@tescofood well duh of course it will it’s a 496 big block, when you put that engine in a boat, given you can afford the engine in the first place you don’t care about gallons per hour, you want to go fast
WTF .. Is it usual to see the water coming out from the exhaust?????
i can see the fuel guage moving already!!
Selman22, well duh?!!! It’s water cooled exaust
@michiganmotorz2008 The 8.1 is a 496 ci engine.I like them.
@sleman22 damnit! he must have blown the head gasket already
haha. oh wait, how does a marine motor get cooled???? 
can i take a motor out of an old truck and pop it in a boat?
@firehawk400 No it’s not. try to find where the distributor goes on a 8.1L. totally different engine and casting. The 8.1l replaces the 7.4l. Just like the 5.3 replaced the old 5.7
@Ryandavis33 fuel gauge? I thought that was the countdown till you can floor it….10…9….8
@sleman22 yes this is standard practice for marine engines. They suck seawater for cooling via a heat exchanger then the water goes into the exhaust to dampen the sound of the motor as these motors do not have mufflers unlike a car as you can hear. its a beast.
@firehawk400 It’s a 496
@michiganmotorz2008 What about bore and stroke and bore angle? Meaning the degree’s of angle in the V? is this all updated to a completely different block?
@kwaky2005 Good Question! Bore/Stroke 4.25×4.37(108 x 11 mm). Bore Center 122.94 mm, Bore Area 732.19 cm
-phil
The bass line of that engine is incredible, I love the cam lope. Could you imagine that with a 3 litre Whipple Roots?
@thompsonsub45 u must be joking its a stock motor! u better look around youtube some more LOL!