Out with the old in with the new.

MonteC

Cadet
Joined
May 20, 2008
Messages
11
I just traded my old turbo buick motor/trans for a freshly rebuilt and decked out 5.7l.

The guy i got it from listed everything over the phone to me but i dont have a memory at all. I tried to get the specs from him but a couple weeks after the trade he is having traders remorse, and is not giving much info up.

Any way here is what i know, fresh rebuild bored .030 over, NON roller motor. New internals, pro top line heads im guessing 2.02 and 1.6 valves, full roller rockers, ratio unknown. Dual plane Air gap intake, HEI billet distributor, and a holley carb (?). He has had it running in his car for maybe a month.

I know i need to change the gaskets and the core plugs, what else do i need to change for this to work in my 74 slick craft 23'. It has a non original 250 merc 5.7 (somebody swapped in at some point) that has water in the oil pan.

I know the cam probably wont work, and since i dont know the specs i want to change it. What cam should i be looking for? What information do i need to look at when making this decision? I plan on using this boat to pull skiers, and tubers primarily. I really dont want to go any faster than 50mph. I think thats plenty fast, especially for the shallow lakes down here.

I know props play a big role in engine performance and boat speed, what kind of pitch and blade count should i be looking for?

I already pulled the manifolds off and took them down to a local marina to be checked out and to see if i could get gaskets for them.

I dont know the weight of the boat yet, once i fix the lights on the trailer ill haul it down to the shop for engine removal and weigh it on the way. May not be for a few weeks as im backed up at the shop at the moment.

Thank you,
Rob
 

MonteC

Cadet
Joined
May 20, 2008
Messages
11
Re: Out with the old in with the new.

Im sorry. My boat knowledge is limited. Ive searched and read a few topics, some stuff is starting to sink in.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,087
Re: Out with the old in with the new.

fresh rebuild bored .030 over, NON roller motor. New internals, pro top line heads im guessing 2.02 and 1.6 valves, full roller rockers, ratio unknown. Dual plane Air gap intake, HEI billet distributor, and a holley carb (?). He has had it running in his car for maybe a month.

Ayuh,... The Distributer,+ Carb are Not marine rated,+ Gotta Go....
The Pro Topline heads are pretty much Junk, straight from China...
Besides,... The Big valves will kill your torque...And with an Unknown Cam,... Good Luck...

I think You're the 1 that got the Screwing...
 

MonteC

Cadet
Joined
May 20, 2008
Messages
11
Re: Out with the old in with the new.

Ayuh,... The Distributer,+ Carb are Not marine rated,+ Gotta Go....
The Pro Topline heads are pretty much Junk, straight from China...
Besides,... The Big valves will kill your torque...And with an Unknown Cam,... Good Luck...

I think You're the 1 that got the Screwing...

Gee, thanks. I guess ill just figure it out as i go. Probably blow something up in the process. Hope my wife has my life insurance up to date.
 

HT32BSX115

Supreme Mariner
Joined
Dec 8, 2005
Messages
10,083
Re: Out with the old in with the new.

Gee, thanks. I guess ill just figure it out as i go. Probably blow something up in the process. Hope my wife has my life insurance up to date.

Well,

You probably won't blow anything up but you will need to replace the carb, dist, ALT, and get a marine cam to get it to run right in a sterndrive application with a water-jacketed manifold/riser exhaust system. (wrong cam= reversion)

If it came out of a car, you'll need the Mercruiser engine harness (or you have to wire it yourself)

What boat is this going into? Is it a sterndrive, jet or a V-drive? If it's an open/exposed engine you can use dry stacks and all the automotive "stuff".

If it's in an engine compartment, you have to change all the "stuff" above to marine "stuff".

Regards,


Rick
 
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