C-281 with MW crankshaft

LarryM · Posted: Mon Nov 26, 2012 8:11 am Post subject: C-281 with MW crankshaft

I bought a 450 recently that was putting water in the engine. It has an M&W crankshaft and a 4.25" bore. The head was cracked so I put a different one on. I got it running and it runs good however it seems to vibrtate more than I expected it to. I only checked the number one rod bearing and it looked really good. I was wondering if anyone has been around these enough to answer my question. Do the M&W crankshafts tend to vibrate more than the original C-281 crankshafts? It vibrates more like a C-264 unbalanced crankshaft. The rod bearing was dated 9/75. I plan on looking at all the bearings to see how they look. I hope the crank is not broken.

ChadS · Posted: Mon Nov 26, 2012 8:45 am Post subject: Re: C-281 with MW crankshaft

dads ol super m has that under its hood. does vibrate quite a bit. a freind has one in his 450 with a LP head and it does vibrate quite a bit too. those slugs are very very heavy. have a good one! : )

mike1972chev · Posted: Mon Nov 26, 2012 9:34 am Post subject: Re: C-281 with MW crankshaft

I am wondering if there SHOULD have been some balancing done on the bigger M&W rotating assembly before it was installed???? (I am NOT familiar at all with their cranks/pistons,ect.)

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