repower a older mercruiser

[LilRedNeckGirl]

Simple Question.... Currently running twin inline 4 cyl gm 181 cid, 140 hp sterndrive mercruisers. Can the outdrives accept, without modification, a 6 cyl gm marine engine and if so what is my best choice? would it be worth the upgrade?
Im looking for something that will give me a bit more "umph" , still give good fuel economy, but hook up directly to my existing outdrive without a bunch of grief and adapters.

 

[Bt Doctur]

Re: repower a older mercruiser

250 IL6 will bolt right up, need a new front mount glassed in. drive gears change to 1.65

 

[robjen1019]

Re: repower a older mercruiser

Second that 250, just make sure you have the extra foot in front of the engines.