What to do about my L67 - 3800Pro.com Forum
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View Poll Results: Which option should I go with.
New heads on old block 0 0%
A new junkyard engine 0 0%
Have it professionally rebuilt 0 0%
Try to rebuild it myself. 2 100.00%
Voters: 2. You may not vote on this poll

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Old 04-28-2014, 09:42 AM
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What to do about my L67

Hi all,

I bought a used engine, mileage unknown and without warranty, from a respected source. The compression turned out to be bad in a couple of the cylinders. He said the engine was running when pulled and I believe him.

This is going into a Fiero and not my daily driver. I want to do this right, but I have all the time in the world. Actually, that's kind of the idea. I love tinkering with cars. I also need to save money where I can, since I do have a family.

Anyway, I was going to take the heads to a machinist for a valve job and have LS springs installed so I can do a cam upgrade in the (distant) future.

I talked to someone this weekend who said that putting new heads on a worn bottom end can cause problems with the rings.

Should I?

1) Put the refurbished heads on the stock bottom. If the bottom end fails, get a different bottom end from PickNPull. Repeat until I get a good one. (I have more time than money.)

2) Get a different engine from PickNPull. If it turns out to be bad get another. This is actually the cheapest option. Most of the engines at PickNPull are pretty high mileage, though.

3) Have the whole thing rebuilt. My machinst knows his stuff, but I'm not sure the Mrs. would be very happy about this.

4) Have the machinist inspect and polish the crank, hone the cylinders, etc. to get everything in spec and then assemble the engine myself. I am reasonably mechanically inclined, but have never assembled an engine before.

Any feedback welcome. I'd rather be embarrassed than have a problem later.
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Old 04-28-2014, 10:34 AM
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Personally I would find out why the compression was low. Squirt some oil in the cylinders that were low, run another test and see if the compression comes up....that will tell you if it is the block/rings or the valves/heads. If the compression comes up I would pull the heads and take it to a competent machine shop for an inspection. They should be able to give you a ball park figure of what it would take to rebuild it, then you could decide your course of action from there.
Good Luck!
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Old 04-30-2014, 09:33 PM
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I guess I should just do the heads and see what happens. It might be fun to try to rebuild it, though...
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