454 7.4 big block question

[wadouglas]

I have a 1979 Bayliner Victoria flybridge with a 5.7L small block V-8. Assuming I have enough room to install it, what would be the pitfalls of putting in 7.4 454 big block. It seems to me a small block 350 is a little under powered for this 27 ft, probably 9000 lb boat.

 

[TilliamWe]

Re: 454 7.4 big block question

The biggest pitfall would be your outdrive being able to handle the torque of a 454 and the weight of that boat combined.

 

[wadouglas]

Re: 454 7.4 big block question

I thought it was only about 100 lbs heavier. I have a 290DP outdrive so I should be good there.

 

[boat1010]

Re: 454 7.4 big block question

There shouldn't be any problem with the out drive. The only problem I see is the extra gas you will burn. BUT I sure do like the extra power when I want it. Sounds like a good deal to me. My 454 id 330HP and there are some 350s that push that much too. You could look at stepping up your 350 too. But usually they are not as reliable after the extra HP. Good luck and happy boating.

 

[AZSenza]

Re: 454 7.4 big block question

There are plenty of crate 5.7 and 6.2 (Stroked 5.7) motors that will deliver the same performance as a bigblock without the weight and poor economy. Built right they will be as stout as the stocker. Bottom line is...a better bottom line!

 

[Gary H NC]

Re: 454 7.4 big block question

The 383 crate motor would bolt right in and have the power...Just a thought.

 

[Bondo]

Re: 454 7.4 big block question

I have a 1979 Bayliner Victoria flybridge with a 5.7L small block V-8. Assuming I have enough room to install it, what would be the pitfalls of putting in 7.4 454 big block. It seems to me a small block 350 is a little under powered for this 27 ft, probably 9000 lb boat.

Ayuh,.... Depending on What Drive you have,...
It can be a Plug & Play,...
Or,..
It could require a Complete Driveline replacement....