i am new hereso I would like to start by saying Hi to every one, I have a Gm 350 that I just bought ran great but the block is cracked so what i want to do is replace it with the crate motor I bought for my truck do I have to change anything besides the carb, distribitor,starter,and altinater can I leave the rest as is , as in the heads manifolds cams and crank


Are if theres somthing you think I should swop out from the other motor let me know thanks

freeze plugs and head gaskets......... freeze plugs need to be brass and head gaskets need to be stainless

So The heads and cam thats on engine now are fine right ? great thanks for the help

You mentioned manifolds. Intake manifold can stay but you have to use the marine exhaust manifold.
I would say the cam is a big maybe. Can you post the cam specs? It may be fine, or you may simply not have optimum performance, or it may ingest water into the engine . That is called reversion.

Ton of different crate motors available from GM - please tell us which you have.

Ok this is the info I found not sure if its right so here goes on the crate motor

Casting # 10066036

350 Cubic inches 4.00" Bore, 3.47" stroke
8.0:1 compression ratio.

250 HP @4300 rpm 350 ft. lbs of torque @ 3600 rpm

Engine consists of the following parts:
Block -part # 10066034, casting # 10066036 2 piece rear main seal 4 bolt main

Crankshaft- part # 3932444 Nodular Iron 1985 and older flywheel bolt pattern.

Connecting rods- Part # 10108688 Powdered Metal

Pistons- part#12514101 Cast Aluminum

Oil Pump- part # 12555284 G.M. High Volume Pump

Camshaft- Part#3863151 Hydralic Flat tappet
Intake Lift-.383" Exhaust Lift-.401"
Intake Duration @ .050"- 194° Exhaust Duration @.050"- 202°
Lobe Seperation-112°
This cam Has a mechanical Fuel Pump Lobe. This is a low end Torque oriented camshaft.

Cylinder Heads- part # 14034808 casting #33417369
1.94" Intake valve , 1.50" Exhaust Valve 76cc Combustion Chamber
7 Bolt style Exhaust Flange Standard 85' and prior intake manifold bolt pattern.
Perimeter bolt style Valve Covers. This head is very similar to the old #882 castings from the 1970's

Ok this is what I have found by lookung up the casting #'s if you guys can find any thing let me know

I believe the cam in the old marine motor is like 450-460 where the one in the crate is 383-401 I beleive Ill leave that cam in what do you guys think?

I will how ever be swaping heads from the 1.94" Intake valve , 1.50" Exhaust Valve 76cc Combustion Chamber

to the 14096217 350 87-up 350/285hp crate engine, 64cc, 1.94"/1.5" valves, 72° intake bolt angle again what do you guys think

Pleas I would like all your input

cam!

As in leave the Intake Lift-.383" Exhaust Lift-.401" cam thats in the crate motor in there are put the 450-460 cam in

Where did every one go lol

There are better cam experts out there. I don't think that cam will hurt anything, it just run as good as it could.Kind of low performance.