Big TAMD question re TAMD73/74/75

[ultrarep]

Hi all, I am looking at several sports cruises in the 42-43 foot area with shaft drive and they seem to mostly have TAMD 74 or 75 motors, I have one on my radar which has the 430hp TAMD73 but cant find much info on this engine other than it seemed to have a short 2year prod run from what I have managed to find, which is scant!
They are all the EDC varient but could someone explain the differences mainy between the 73 and 74?
Should I avoid the 73 or treat it as a 74?
I understand the 74 can come in the same 430hp and also 480hp and that the 75 is most def 480hp

This would be my first forray into the world of shaft drive boats having had outdrives all the last 20 boating years.
Any info on the specifics of my questions would be great and very very welcome as would any other info and advice re these motors.

I get they will be less efficient burn more fuel too but I am most definately lookng for less out of the water time and overall work to keep things running right. So before I take the S.H.A.F.T plung on these monster blocks all and any help and advice would be gratefully recieved

Many thanks in great anticipation

 

[volvopaul]

74/75 ok , leave the 73 alone.

 

[ultrarep]

Thanks for that Paul, did not expect an answer like that as most VP motors I have had have been solid and reliable.

Whats the problem with that motor? as I thought it was a linear progression to the 74 and not much different.

There is a Targa 43 with them on the South coast that I am / was interested in looking at but your sage knowlege is now making me think twice. Can you give any details of why to avoid or are they really bad motor?

Also I think you may ha e a had a T43 any reccomendations and advice on them?
The one Thatbis on my list to look at it at Swannick if you have worked on it?

 

[volvopaul]

Thanks for that Paul, did not expect an answer like that as most VP motors I have had have been solid and reliable.

Whats the problem with that motor? as I thought it was a linear progression to the 74 and not much different.

There is a Targa 43 with them on the South coast that I am / was interested in looking at but your sage knowlege is now making me think twice. Can you give any details of why to avoid or are they really bad motor?

Also I think you may ha e a had a T43 any reccomendations and advice on them?
The one Thatbis on my list to look at it at Swannick if you have worked on it?

No I haven't worked on it. The 73 wasn't a good motor prone to piston failure , I've seen a few in fact there is a post on the forum of one failing recently .