ENGINE SWAP

[bicedawg]

i am new to boating got a great deal on a 19' bayliner with a ao225d with a 270 outdrive. well motor is cracked water jackets below the heads my question is can i use a stock gm 305 in this boat? i know hp will be down comapaired to the volvo penta i think most of the parts are good except the block (duh) please help and thanks pb this is a 1984 with a carb again thanks

 

[Boomyal]

Re: ENGINE SWAP

Welcome to iboats forum, bicedawg. If your current engine has a 305 block, it is essentially no different from an automotive block. The two primary differences in the block itself are cylinder tolerances (boat motors have more clearance due to the rapid expansion and contraction from drawing cold, raw water for cooling) and brass freeze plugs. <br /><br />Without doing extensive research before altering, be sure to use the same cam and piston style. Also you want to be sure to retain the marine specific items such as the carb, fuel pump, distributor, alternator, water pump, alternator and starter.<br /><br />Good luck and keep us posted.

 

[bicedawg]

Re: ENGINE SWAP

thanks any idea on web sites for specs on this motor? thanks pb

 

[Dunaruna]

Re: ENGINE SWAP

Bicedawg, 'clymer' sterndrive manual lists the AQ225D as a 305.<br /><br />Part number for the manual is B770, it has all the specs you might need.

 

[Bondo]

Re: ENGINE SWAP

can i use a stock gm 305 in this boat?

Yes..........<br />If you want, a Chevy 305 Block from a junkyard can be preped,+ assembled using All the Internal,+ External parts from your existing motor..............As long as it's a 1980 to 1985 Block......<br />OR,<br />A Much Better Choice, IMO, is to buy a GM Goodwrench 350, 5.7l Pick-up truck replacement motor, for a 1984 pick-up truck........<br />You'll get a More Powerful engine(45cids more)......<br />As long as the freeze-plugs are changed to Brass, Your Good to Go......<br />The Cam grind in a truck motor is So Close, that You'll Never Know the Difference(Idle to 4500rpms).......