| [GMCnet] The Olds 403/455 were an out standing choice for our GMC's [message #342129] |
Sun, 31 March 2019 23:57  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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I've built many V8's of many sizes, and manufactures. These Olds engines have a very stable main bearing web area.
They've performed well. The problems experienced by GMC owners are. For the most part have been self inflicted. Our first GMC that burned had 154,000 miles on it. According to the log book. The 403 had never been apart except for a timing gear replacement that I did. Used a qt of oil by the time of an oil change. At 3,000 miles. Good oil pressure. With compression readings of 145 to 150 PSI. Always had mineral oil used. This is what you get out of a well maintained 403/455. Blame the owner. That's the problem. Not the engine. Bob Dunahugh 78 Royale Iowa.
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