Merc 5.7 / B3 rebuild

[torombolo]

Hello everyone, been away for a while life and hurricanes get in the way of many things. Anyway I have a Mercruiser 5.7 Bravo 3 combo that I nee to work on, the engine block broke off where the starter bolts on. Anyway, I need a new engine block and want to use as much of my existing engine as possible, all the inner with new piston rings of coarse, which brings me to my question:
1- Aside from piston rings and freeze plugs what else is a must to have new?
2- Any suggestions?

Thanks in advance for any help and suggestions

 

[Scott Danforth]

pistons as you have to mic the bores and pistons. most likely you can not re-use the pistons unless the others have less than 100 hours on them. you still need to mic them. cant simply slap new rings in the bores unless you hone. and honing changes the bore diameter. most likely you will need to bore and hone unless you buy a new block.

bearings, possibly crank. you wont know until you mic them. cant re-use bearings. if the crank is worn a bit, you will need to have it ground

Head bolts as most stock head bolts are TTY (Torque to Yield)

unless you start with a new block, assume you must line-hone, deck, bore and hone the block.

you do realize you can simply pull a truck motor and strip it down to block and heads for dirt cheap.

you can also buy a complete new block, heads and rotating assembly for a 350 for about $3k and build a stock motor or a stroker (377): New block is $700, new assembled heads are $500, new rotating assembly (either stock stroke, or +1/4" stroke ) $900. New bearings $170, new gaskets $150, new core plugs $10, new oil pump $50, new timing set $50, new head bolts $40

 

[torombolo]

Scott, thanks for the enlightenment, I knew I could not be as easy as swap and play LOL

 

[Bondo]

I knew I could not be as easy as swap and play LOL

Ayuh,.... It Is,.... ya just gotta look at the bigger picture,.....

For dollars spent, 'n time invested, 'n Reliability after yer done,....
Buy a reman Long Block crate motor replacement,.....
It'll end up, Waayyy cheaper than the work, 'n parts necessary to swap Just the block castin' for yer old motor,...

 

[Scott Danforth]

your signature points to what caused your starter motor to break off the mounting ear.

since you keep the boat in the brine.....when was the last time you inspected your exhaust manifolds and elbows

 

[torombolo]

Gotta change that one, boat has been out of the water for 3 years now. Latest inspection was last year Y had to remove them a few times, cleaned and paint. Both are in excellent condition, I agree, the time this boat spent in salt water was no help at all