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Replace or rebuild Model 270 5.7??

T

timmy66commander

Member
Hello,

I have a 1988 Model 270/5.7L motor that has low compression in a few cylinders. The motor had a new head gasket and heads shaved/rebuilt approx 7 yrs ago. Unknown hours since then, but at least 5000 miles (nautical miles/GPS). The block is a rebuild from "Recon/Philly"). It does use a bit of oil (1 qt/400 miles??).

Compression is as follows;

1/170 lbs
3/135 lbs
5/170 lbs
7/165 lbs

2/170 lbs
4/70 lbs
6/145 lbs
8/135 lbs

My question is, replace with long block or redo the heads/gasket again?


Thx,

Timmy
 
Timmy, if this engine has been raw water cooled its entire life, I would not consider an overhaul.
You're only a few hundred dollars (if that) away from a good automotive core that's seen ethylene glycol coolant its entire life!
But there's a bit more to this!

Here are a few threads that may interest you:

Start at post #7 in this one.
http://www.marineengine.com/boat-forum/showthread.php?394668-V6-to-V8-engine-swap

You may find some usable information in this one also.
http://www.marineengine.com/boat-fo...iser-350-260hp-what-parts-do-I-buy-for-rebuil.


.
 
As in "Closed Cooling System"?
If so, it will or should qualify for an overhaul. Just steer clear of the GM full dished piston!

.
 
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