Engine Identification

[italian]

Can anyone tell me how to go about identifying exactly what engine is in the boat that I own?<br /><br />It is a 1968 17' Sabrecraft Riviera with an inline GM motor and an OMC stern drive.<br />The person that I purchased it from said that it was a 153 CI, but I am unsure of that.<br /><br />The wiring setup that is on the boat lead me to believe it may be the 181 CI engine. But I need to know for sure.<br /><br />There is no tag on the engine, the stamp that is on the head is GM 3905998, the distributor side of the block is stamped with m0820bw6x but I do not know where to look for information.<br /><br />I have searched everywhere I can think of and have come up empty-handed. <br /><br />Can anybody assist in this ID or at least let me know where I should be looking!<br />Thanks!

 

[Haut Medoc]

Re: Engine Identification

Bondo,Don S. or Rodbolt would know....Have you tried contacting G.M. directly?.....JK

 

[italian]

Re: Engine Identification

No I haven't, would that truly help? If so, How would I go about contacting them and what department would I speak to?

 

[rodbolt]

Re: Engine Identification

externally there is not a really good way for me to describe the difference in the 3.0 and the 2.5(153CID) motors. there is a slight difference along the pushrod cover side of the motor and some difference in the intake/exhaust ports in the head. if its the original motor its a 153 cid.<br /> the GM marine catalog may help or contact GM marine. maybe a google search will help eith GM marine contact point.<br /> other than a different water jacket, externally there is not much difference in the 153 and the 181 motors.<br /> as the japs always ask when we have a question, why you need to know ?

 

[italian]

Re: Engine Identification

I need to know because I am planning on doing a rebuild and want to make sure I get the correct parts, either that, or just do an engine swap.

 

[whywhyzed]

Re: Engine Identification

The 181 has a dampener on the front of the crank. The 153 has only a pulley as the crank is balanced elsewhere.<br /><br /><br />On any i have seen at least.. in 1968 I was 3...