Correction . . aluminum block and cast iron cylinder heads
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without a doubt -
the HT 4100 was absolutely the worst engine Cadillac EVER produced -
most of them died an early death -
the only thing you can do to prolong it's life
is PRAY - cross your fingers - and follow the maintenance schedule -
regular fluid changes -
and regular "pre-flight" inspections
will go a long way catching a problem early -
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can't speak first hand. I'm only saying what I've heard from personal friends. V8-6-4 and HT4100 were not good times for Cadillac.
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V8-6-4 and HT4100 were not good times for Cadillac
the 368 is a 472 - with smaller diameter pistons -
the problem with the 368 - 8-6-4 was the electronics - NOT THE ENGINE -
pull one wire - and you had a reliable fuel-injected motor -
the 8-6-4 was only used for one year -
however - the 368 was used for several years -
with a plain old Quadrajet 4 barrel carburetor -
in the rear wheel drive cars - commercial chassis - hearse and ambulance -
and would last hundreds-of-thousands of miles -