| Re: [GMCnet] Differences between 403 and 455 [message #279128 is a reply to message #279098] |
Fri, 05 June 2015 10:42   |
rvanwin
Messages: 325
Registered: April 2007
Location: Battlefield, MO
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George Beckman wrote on Fri, 05 June 2015 00:27
One oddity about the 403 is that it has siamese cylinders, meaning there are no water jackets between 2&4, and 6&8. (other side as well) Apparently this is not a problem. I forget the mileage he has on the coach... I am guessing 78K or something like that. We could feel no ridge at the top of the cylinders. Cylinders looked perfect.
If I ran on to a nice 403, I might just consider swapping. (hate to think about finding all the brackets.)
What George said! I have a little over 100K miles. It has been a good running engine. As George said, we pulled the head last winter because of a Tuliped intake valve. The cause is a little uncertain, but I believe it was caused by a failed spark plug. It appeared the electrode on the plug came loose and welded itself to the ground lug. Replaced valve and all seems to be good after around 5,000 miles.
I love the 403 when mated to a 3.70 final drive. I would not let the type of engine be a deciding factor in making a coach decision.
Randy & Margie
'77 Eleganza II '403'
Battlefield, MO
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