350 mercruiser

[calwldlif]

Re: 350 mercruiser

Why Not?
I have seen you speak of the importance of balanced
crank assm.

I don't fall into the one size fits all
when it comes to cams. RV, Towing, Truck
Street,Track, 1/4 Race, 1/2 Race, Full Race
...............Marine
No telling from the motor "crate truck" what
comp/ratio, fuel needs power band, "IDLE Speed"
Torque curve. Dist will be marine from old motor
cam should match advance curve of cam.(don't want
ping.knock).
His carb is jetted for MERC not cheby truck again
cam,heads, comp/ratio. Pistons? domed?flat?
dished?
I want this guy to have limited problems.......
I don't believe an unknown 350 (truck) crate
is an exact fit. Only looking at the parts
will changes show up.
So if I can get this guy to think and check his parts
he will have better success.
I don't know what crate hes got.................
Now if he is trying to up his motor then a whole
other approach is needed

 

[eugene1e]

Re: 350 mercruiser

calwldlif I will be using the 14096217 heads which are marine heads I will be checking the cam and crank tomarrow for casting numbers but more then likely i will be using the cam and crank from marine engine becouse it only has 8 hours on the parts then it sat and winter came so the block froze i will post casting #'s from crank and cam when i get a chance

 

[Bondo]

Re: 350 mercruiser

Don't Change the Crankshaft Or the Cam,............

The Crankshaft was Fitted to the Block it's in Now,........

Swapping them will get you Nothing but Problems,.............

As for the Cam,....... I'd leave well enough Alone,......It's also been Fitted to the Block,...And, as I said before,..... The Grind is So Close to a Marine Grind,... You'll NEVER know the Difference......

There's No Reason,.. What so Ever to open up the Long Block to Change ANYTHING but possibly the Core Plugs to Brass.........

But,.......
If you like Making Extra Work for yourself,... with No Reason,....
Have Fun..............
It Sounds like calwldlif wants you to Rebuild a Rebuilt Motor..............Wasted Effort in My life.......

 

[eugene1e]

Re: 350 mercruiser

The crank in the marine block has a casting # of 3932442 which was made in 68-85 used in Pass,Camaro,Chevelle,Corvette,Nova,Truck made from Cast Iron with Large Journal cam to come later

 

[eugene1e]

Re: 350 mercruiser

The only #'s I see on the cam are 944

 

[eugene1e]

Re: 350 mercruiser

Where can I find the serial #'s so I can find out which out drive I have

 

[Bondo]

Re: 350 mercruiser

Where can I find the serial #'s so I can find out which out drive I have

You Probably Won't............

What Year is the Boat,..??....

 

[eugene1e]

Re: 350 mercruiser

The boat is a 76 but the inboard motor that was put in it is a 87 i beleive

 

[MelLandry]

Re: 350 mercruiser

285/300 hp 1985 350... does that sound like roller tappet to anyone else? More problems if switch with the flat tappet cam from the old marine? Likely not, but possible?

Just throwing stuff out there, I don't claim to be much besides an environmental scientist...

From everything I've heard I wouldn't worry about anything except that which is beyond the longblock. The grind on the crank won't be exactly the same, but it'll be close. When it's all said and done, you might need a new prop. If I ever get mine back in the water I'll let you know how a project nearly identical to this turned out.

 

[Silvertip]

Re: 350 mercruiser

No roller tappets in that vintage 350.

 

[calwldlif]

Re: 350 mercruiser

I find it interesting that someone when
building an engine, would by a crate
motor and just SLAP it together.
Having inspected GM crate motors
before using and finding BAD assembly
and parts I prefer to inspect everything
whiles it inspectable.
Block crank journals are same
bearings standard
cam bearings standard(straight or not is all you got)
Only issue is cyl bores
Rings are set to bore.
Not knowing if his crate is what? Pistons cast?
dished?
relieved?
to much unknown.
If Bondo likes to SLAP together good.
I give you advice you can take or not.
I don't care.
I will never tell someone to do anything
I am not there and don't know whats what.
I give my opinion and not in ABSOLUTES.
I see too many people on boards
say "DO THIS DO THAT"
I say might be, check this
Since Bondo sees fit to call me in I will
oblige him.
I have forgoten more about motors than
I'll ever need to advise here.
I believe stock spec motors are the best
running, longest lasting, easiest repairing
general good powerplant.
Fuel mixtures, comp ratios, powerband
idle specs, max rpms.are well established.
When you start improving one area others need
attention also. I am not saying a stronger
motor is not attainable.
If Bondo wants to work that way fine,
I don't.

 

[Reel Poor]

Re: 350 mercruiser

The boat is a 76 but the inboard motor that was put in it is a 87 i beleive

You need to know for sure.

The 79 and 84 are the same vintage but the 87 is a horse of a slightly different color. The flywheel, harmonic balancer, and the intake manifold are different and will not fit the 84 model crate engine.

 

[eugene1e]

Re: 350 mercruiser

I find it interesting that someone when
building an engine, would by a crate
motor and just SLAP it together.
Having inspected GM crate motors
before using and finding BAD assembly
and parts I prefer to inspect everything
whiles it inspectable.
Block crank journals are same
bearings standard
cam bearings standard(straight or not is all you got)
Only issue is cyl bores
Rings are set to bore.
Not knowing if his crate is what? Pistons cast?
dished?
relieved?
to much unknown.
If Bondo likes to SLAP together good.
I give you advice you can take or not.
I don't care.
I will never tell someone to do anything
I am not there and don't know whats what.
I give my opinion and not in ABSOLUTES.
I see too many people on boards
say "DO THIS DO THAT"
I say might be, check this
Since Bondo sees fit to call me in I will
oblige him.
I have forgoten more about motors than
I'll ever need to advise here.
I believe stock spec motors are the best
running, longest lasting, easiest repairing
general good powerplant.
Fuel mixtures, comp ratios, powerband
idle specs, max rpms.are well established.
When you start improving one area others need
attention also. I am not saying a stronger
motor is not attainable.
If Bondo wants to work that way fine,
I don't.

I have checked all of this I will be replacing rod and main bearings cam bearings I will also be honing cylinders and replacing rings the cylinders are bored to 399 so there a little under bored they are dished with releaves

 

[Bondo]

Re: 350 mercruiser

I have a brand new 350 crate motor I got for a truck that im not using what if any are the diffrence's in these motors would like to get one of them going

Well I Guess I'm Confused here,..........

I really Can't see putting the effort into Rebuilding a " brand new 350 crate motor "........................
I Thought this thread was about installing a " brand new 350 crate motor " in a Mercruiser driven boat of Unknown Vintage..........??............??........

calwldlif,................ I'm Sorry,..... Maybe "Useless" wasn't the proper Word to use in My responce to your inquiry about WOT, RPMs........... Looking at the chart you presented in that thread,...... Maybe I should have said it was Wrong instead,......I'm a Mechanic,..... Not a Wordsmith.......


eugene1e,........
Have you figured out whether you have an Alpha1 drive,.. Or a Pre-Alpha drive,..??.....

 

[eugene1e]

Re: 350 mercruiser

Well It was brand knew 2 years ago but its been setting so after taking the heads off I noticed some light surfice rust from setting so I'm goning to hone it out And I never ask what was the fastest way to get back on the water I want everyones input on how to get it going right I want it to last

 

[calwldlif]

Re: 350 mercruiser

There are alot of unknowns
in the orig 350
and the crate motor.

I know there are different
cams listed,(with diff specs)
for truck and marine.

Stock truck replacement cam fits
55-84. 1 cam. avail
Specs are diff for marine.

I didn't invent different cams.
I don't see orig HP rate for motor
or HP rate for crate.
Light duty truck?Don't know.

I don't see where you inquired about those factors.
I know you don't agree with my OPINIONS.

I feel it is important to know whats what.
If my wanting the guy to check his parts
for comp ratio by looking at pistons and heads
and wanting a cam used that the manu felt was
needed is wrong in your eyes OK.

To tell him yea its direct replacement when you
don't know what he even has is something I
won't do.

What is wrong with him checking his stuff?
You are not doing it.

You mention direct replacement crate motor
on other threads..........................
I don't see where you asked about eng codes.

Why don't you just say "xxxxxx eng code crate motor
#xxxxxxxxx is direct replacement"
To easy?
Direct replace for what?
Dude let it go...........

 

[Bondo]

Re: 350 mercruiser

Dude let it go...........

That's what I'm saying............

I stand by My previous Statements..................

 

[Olds Eddie]

Re: 350 mercruiser

I agree with bondo. If you want to get on the water quickly and cheaply, go with the crate motor. If you want a really good motor go with forged pistons, marine roller cam and lifters and have the assy. balanced by a reputable race engine builder. By the way a little surface rust will just make the rings seat quicker. That is if it is just a discoloration thing. There is a big difference between a crate engine and a blueprinted one.

 

[jastacey]

Re: 350 mercruiser

And the differance is a whole lotta cubic dollars

 

[lilmandavis]

Re: 350 mercruiser

just for the record.... :devil: i tear all my "crate" engines down bore gauge and have the cranks spun to make sure thier round and true. i also put in v series bearings for better journal lubrication.i have re ground three of the 100 or so engine cranks ive torn down. thats not bad. you didnt mention where that long block came from? it wasnt auto zone was it? and as for forged pistons....those have big price tags hanging off of them lol. with all the goodies that go with them. 8) i say some fish is better than no fish