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Hello, this is my first engine build, I have a 2.8, which was in a 1985 Fiero, that I have taken apart and that I am slowly rebuilding. The engine itself was in general in good condtion except for a cylinder that had had water in it. I ve had the block cleaned and the cylinders oversize and I have most of the parts to start rebuilding it except for the main bearings.
I have bought main bearings twice; the first time I got main bearings for the smaller diameter journals found in early 2.8s and the second time I got std. size bearings for the later model 2.8. Neither of which fit the block, the std. size bearings are to small.
The block has the #820 casted on it which I found out is the number for a FWD 2.8 found in many GM cars, including the fiero. The crank is casted 817. Through research I have found that the main bearing bore size for a 1985 2.8 is 67.289mm, but when I measure my block and journals bore size I have 73.8 mm.
I thought that maybe the engine had been rebuilt previously and that the main and journals had been bored so I looked at the engravings on the back of main bearings and found the following :
GM 4
18011212 and on the other end 268 N 532
Now since it is written GM on it I assume that it is the main bearings that came in the engine from factory but I could be wrong.
Now do I have an odd ball block and ive looking for the wrong parts all along (quite unlikely) or has this engine been opened before (quite probable). Where can I find he right part.
Help would be very appreciated. Thank you.
I have bought main bearings twice; the first time I got main bearings for the smaller diameter journals found in early 2.8s and the second time I got std. size bearings for the later model 2.8. Neither of which fit the block, the std. size bearings are to small.
The block has the #820 casted on it which I found out is the number for a FWD 2.8 found in many GM cars, including the fiero. The crank is casted 817. Through research I have found that the main bearing bore size for a 1985 2.8 is 67.289mm, but when I measure my block and journals bore size I have 73.8 mm.
I thought that maybe the engine had been rebuilt previously and that the main and journals had been bored so I looked at the engravings on the back of main bearings and found the following :
GM 4
18011212 and on the other end 268 N 532
Now since it is written GM on it I assume that it is the main bearings that came in the engine from factory but I could be wrong.
Now do I have an odd ball block and ive looking for the wrong parts all along (quite unlikely) or has this engine been opened before (quite probable). Where can I find he right part.
Help would be very appreciated. Thank you.
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