455 longevity

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Years Owned: 1969 Toronado owned 4 years

455 longevity

Postby Val » Wed Aug 01, 2018 5:35 pm

What is the expected life span for a 455? I'm seeing many early Toronados for sale with mileage under 100k but with rebuilt or non original motors? Recently found my car also has had a motor change, at around 70k miles, which is when it was restored to this present condition.
Val. T

Otto Skorzeny
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Years Owned: 1966 Toronado

Re: 455 longevity

Postby Otto Skorzeny » Thu Aug 02, 2018 4:58 am

I think the biggest problem with the engine is that GM used nylon coated timing gears. The nylon disintegrates over time regardless of mileage. The pieces flake off and clog the oil pump, etc.

Hopefully yours was replaced with a regular, nylon free gear set.

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Re: 455 longevity

Postby Mikel » Sat Aug 18, 2018 6:03 pm

A well maintained and tuned 455 will last a very long time.

These old engines didn't have the benefit of a self-adjusting EFI system, positive crankcase ventilation or modern oils.

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Re: 455 longevity

Postby bcroe » Tue Aug 21, 2018 6:03 am

My own experience is that the emissions engines starting about 1976 need
a whole lot less attention than the high performance 60s engines. I credit
this to the hardened valve seats, valve rotators, HEI ignition, and likely better
rings. My 60s engines seemed to soon need valve jobs and other levels of
overhaul, but the emissions engine properly maintained (new timing chain)
just keep running. Peak power is down some, but the 87 unleaded fuel is
a lot cheaper.

Olds 403 is the choice here, 350s run well also. Bruce Roe

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