Is a 1992 4.3 l v-6 Merc motor replacable with an automotive type 4.3 engine block?

[ChuckConway]

I've got a blown 1992 MerCrusier 4.3L.

A Marine 4.3L long block is ~2500 dollars. The same long block at Autozone is 1300. What's the difference?

From what I have been told, is the Marine engine has brass freeze plugs and a different camshaft with heavier springs.

Thanks,

Chuck

 

[mkast]

Re: Is a 1992 4.3 l v-6 Merc motor replacable with an automotive type 4.3 engine bloc

The camshaft is different and the core plugs might be.
Why heavier springs?

 

[metro3pilot]

Re: Is a 1992 4.3 l v-6 Merc motor replacable with an automotive type 4.3 engine bloc

call Rapido Marine and spend about the same as autozone

 

[180shabah]

Re: Is a 1992 4.3 l v-6 Merc motor replacable with an automotive type 4.3 engine bloc

call Rapido Marine and spend about the same as autozone

You'll get a warranty from Rapido - you'll void the autozone warranty as soon as you put it in a boat.

 

[ChuckConway]

Re: Is a 1992 4.3 l v-6 Merc motor replacable with an automotive type 4.3 engine bloc

The camshaft is different and the core plugs might be.
Why heavier springs?

Here is where I read it: motor replaceable with an automotive type 4.3

The guy says because the engine runs at a different RPM.

 

[mkast]

Re: Is a 1992 4.3 l v-6 Merc motor replacable with an automotive type 4.3 engine bloc

Here is where I read it: motor replaceable with an automotive type 4.3

The guy says because the engine runs at a different RPM.

You should start researching this project before believing some dribble on the internet.

 

[bruceb58]

Re: Is a 1992 4.3 l v-6 Merc motor replacable with an automotive type 4.3 engine bloc

Since the 4.3L was used in trucks only(correct me of I am wrong) the cam and valve springs should be the same.

 

[ChuckConway]

Re: Is a 1992 4.3 l v-6 Merc motor replacable with an automotive type 4.3 engine bloc

Since the 4.3L was used in trucks only(correct me of I am wrong) the cam and valve springs should be the same.

You are correct. It was used in S10's and the GMC equivalent.

 

[ChuckConway]

Re: Is a 1992 4.3 l v-6 Merc motor replacable with an automotive type 4.3 engine bloc

You should start researching this project before believing some dribble on the internet.

That's why I am asking

I've rebuilt car and truck engines, but I've never done any serious work on a marine engine.

The recommendation to get a long block from Rapido Marine is a good one. I might go that route.

--Chuck

 

[mylesm260]

Re: Is a 1992 4.3 l v-6 Merc motor replacable with an automotive type 4.3 engine bloc

I'm running a motor straight out of a 2001 AWD astro van (4.3) Automotive EFI and all, runs absolutely perfectly. The truck cams are very very similar (if not the same) as the marine cams...