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Author Topic: Need help identifying an engine  (Read 15827 times)

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GTRS Fiero

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Re: Need help identifying an engine
« Reply #30 on: May 10, 2020, 11:16:56 pm »
Quote from: Fierofool on May 10, 2020, 10:33:38 pm
But the two heads are identical and interchangeable side to side.

That's what I thought.  So, there could be more casting numbers of which we're unaware?
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Fierofool

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Re: Need help identifying an engine
« Reply #31 on: May 11, 2020, 08:47:44 am »
I did find a reply in a blog that GM occasionally changed a casting number in almost anything, but the part didn't change. 
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scottb

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Re: Need help identifying an engine
« Reply #32 on: May 11, 2020, 05:05:47 pm »
I got lazy and only took a picture of 1 head. Will go by thete tomorrow after work to roll the engine over and get a picture of the other head. Will also get pictures of the heads on the bad engine.
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TopNotch

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Re: Need help identifying an engine
« Reply #33 on: May 11, 2020, 07:21:03 pm »
Quote from: Fierofool on May 10, 2020, 10:33:38 pm
But the two heads are identical and interchangeable side to side.  I found a notation that GM would change a casting number slightly during production but not change any specs of the head.
It may not have been numbers for one head and the other, but just  two alternate numbers for the same head. i just assumed when I saw two numbers.
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scottb

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Re: Need help identifying an engine
« Reply #34 on: May 12, 2020, 08:56:54 pm »
took some more pictures for yall:

rear head on blowed up motor


One head on 3.1 (there is a "1" buried under the sludge):



other head on 3.1:




picture proof that the heads are the same


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Fierofool

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Re: Need help identifying an engine
« Reply #35 on: May 12, 2020, 09:25:37 pm »
Hey, Steve.  Do you know what the head casting number is for the Fiero?  It should be the same as the one in the blown motor.  That was an original motor. 
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Fierofool

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Re: Need help identifying an engine
« Reply #36 on: May 12, 2020, 09:33:56 pm »
Quote from: TopNotch on May 10, 2020, 10:20:05 pm
Fiero heads are 14054884 for one head, and 14087879 for the other one on my list.

According to Pat's list, the replacement motor has the correct heads.  Good news.

Got the new flywheel and pan gasket in today.  New ATP flywheel bolts on the way.  Got to order the poly cradle bushings. 
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There are three kinds of men:

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2.    The few who learn by observation.
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Raydar

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Re: Need help identifying an engine
« Reply #37 on: May 13, 2020, 07:33:37 am »
Quote from: Fierofool on May 12, 2020, 09:25:37 pm
Hey, Steve.  Do you know what the head casting number is for the Fiero?  It should be the same as the one in the blown motor.  That was an original motor.

I understand that there are several casting numbers, all of which are essentially identical. The only difference is the size of the valves, and the machine work to accommodate those valves. 
All of the EFI engines (as well as the carbed 2.8 HO in the X-11) supposedly got the larger valves. The carbed S10 engines got smaller valves.
Sorry. I know that's not a lot of help.
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