Join Date: Aug 1998
Location: Waldorf Md. USA
Allright guys...I have to chime in,
Who assembled this engine ????? If the machine shop did, then they "might" be resoponsible. If anyone else did, then the person who assembled the engine is responsible. All the machine shop can do is finish the main bearing bores to a size within the factory specs. If they finished them on the tight side of the spec, and the crankshaft was finish ground on the large side of the specs, then the clearances "might" have been too tight. BUT....it is the engine builders responsibility to check them !!! If you did not check the bearing clearances, then shame on you...you should not be assembling engines. If you did check them and they were what you wanted them to be, then how can you blame the machine shop ???
By the way, we prefer the main bearing bores, and connecting rod bores, to be on the tight side of the spec...it helps hold the bearings in place a little tighter, making certain of good heat transfer, and less chance of bearing movement. Have never had a bearing problem due to this practice.
I dont think the machine shop owes you anything, you might owe them an apology if they happen to read this.
Advanced Automotive Machine
1971 Chevelle "Heavy Chevy" original owner