455 OLDS

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illumicon1

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« on: December 26, 2008, 10:17:12 PM »
I hear and read alot of bad things about the 455 OLDS. I have one in my '82 Nordic. As it runs fine now, what should I watch for or do to prevent any problems?


nathan72

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« Reply #1 on: December 26, 2008, 11:05:29 PM »
i run a 455 and it in pieces i spun a bearing :banghead: to lean and lack of oil on the bottomend (oil oil oil) make sure it has oil resisters
THE SLOUGH CREW

Beaveretriever

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« Reply #2 on: December 27, 2008, 01:07:36 AM »
i have a 455 in my boat and i spun a bearing and sucked both head gaskets. the big problem that i found out about the 455 is that they have oil return problems. if you are just going to use the boat for your typical ski boat you will be fine, they have run those motors for years. the oild restrictors are good but are not cheap. just keep the motor under 4800 and you will be fine, dont run it for a long time at high rpm. the 455 is expensive and hard to find parts for, and if you want to make alot of HP then you should change motors to BBC or BBF. thats my .02

The Beav
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Marlin

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« Reply #3 on: December 27, 2008, 09:54:22 AM »
I to was careless with a 455 and spun a rod bearing. Restricters in the mains, a new crank, and new bearings later its good to go.

http://store.summitracing.com/partdetail.asp?part=SUM%2D120120&autoview=sku

If it isn't broke your not trying hard enough.

nathan72

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« Reply #4 on: December 27, 2008, 10:21:39 AM »
i hope it runs but i had the block .00" decked. scat crank and h-beam rods. oil restrictors(pushrods,in the block and bearings), keith black pistons (fly cut), roller hydraulic cam and lifters and roller rocker on a set of ported "C" heads and a 10 QT pan
« Last Edit: December 27, 2008, 10:25:13 AM by nathan72 »
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JWBOYER21

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« Reply #5 on: December 27, 2008, 06:07:54 PM »
how hard would it be to change from an olds 455 to a BBC?

the reason i am asking is cuz i have pulled the motor out of my southwind and it's gonna cost me alot to fix. i can buy a chevy motor ready to go for about a grand. how much extra work is needed? anybody know?
is it 2012 yet??
73 southwind 455 olds (in pieces)
74 kona 455 olds SOLD

povertyjet

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« Reply #6 on: December 27, 2008, 06:15:20 PM »
New to 455s, but let me get this straight, I have a 455 with a stock hydraulic camshaft/lifters, and people recommend running oil restrictors??? If I had a solid lifter (roller or tappet) cam, I see the logic.  But otherwise what keeps the top end wet.  Maybe I do not understand how a 455 oils the lifters, pushrods, valvetrain...

Someone explain this to me like I am 7

thx
poverty
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JWBOYER21

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« Reply #7 on: December 27, 2008, 06:24:32 PM »
yes you need an oil restrictor. plane and simple, olds do a poor job at balancing the oil. high rpms= all the oil goes up, no oil left in the pan. restrictor kit balances the oil. this i what i have gathered, also learned (my motor is blown now)
is it 2012 yet??
73 southwind 455 olds (in pieces)
74 kona 455 olds SOLD

Marlin

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« Reply #8 on: December 27, 2008, 06:28:28 PM »
Ok, oil restricters don't plug the oil passage, they make the hole alot smaller for the oil going to the heads.
If it isn't broke your not trying hard enough.

povertyjet

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« Reply #9 on: December 27, 2008, 06:35:40 PM »
I understand what oil "RESTRICTORS" do, I have never used them with a hydraulic valve train, only solid lifter cams. 

There's got to be more to this story.
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GlassCutter

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« Reply #10 on: December 27, 2008, 06:52:29 PM »
My 455 will run for about a mile WFO and then the oil pressure will drop rather quickly to a dangerous level.  Soon after it will drop to a catastrophic level.  Go BOOM
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« Reply #11 on: December 27, 2008, 07:07:10 PM »
how hard would it be to change from an olds 455 to a BBC?

the reason i am asking is cuz i have pulled the motor out of my southwind and it's gonna cost me alot to fix. i can buy a chevy motor ready to go for about a grand. how much extra work is needed? anybody know?

im doing a bbc conversion right now in my boat and it just takes alot of time. you will need to buy motor plates,starter,PTO,driveline,headers or logs.
check it out
http://www.socaljetboats.com/index.php?topic=4399.0

The Beav.....

there will be updates tonight on that post.
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povertyjet

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« Reply #12 on: December 27, 2008, 07:20:19 PM »
there are ALOT of reasons pressure drops, heat and expanding clearances are the two main reasons. which goes to condition of bearings, bore size, condition of oil? filter?  And not to upset anyone, but alot of these boats are WAY over carbureted...the multi /giant carb setups look cool but unburned fuel fouls plugs affecting the way they absorb and tranfer heat into the head.  Unburned fuel also contaminates oil diluting it.
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I'll keep my freedom, my money and my guns...you keep the "change"
U.S. out of the United Nations, support HR2202, reinstate prop 187, waterboard all of them!!!

GlassCutter

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« Reply #13 on: December 27, 2008, 07:34:22 PM »
I have heard that simply drilling big fat holes in certain places to allow quicker return from the heads goes a long way towards helping oil distribution problems.
  • Boat #1: 1973  Wriedt Montara 23
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Also, I will kiss bare male ass in the middle of the Vegas Strip  . . .  I will post pics if I need to.  --  IRRebel 2013

"Go ahead Rivertard does it.  Take a video though."

"If you did it in a dodge it would have shifted perfectly ran a thousand miles per hour and got optimum fuel mileage!"  Nordie  2012

povertyjet

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« Reply #14 on: December 27, 2008, 07:39:31 PM »
absolutely, opening up and smoothing the drain holes in lifter valley, and the heads
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I'll keep my freedom, my money and my guns...you keep the "change"
U.S. out of the United Nations, support HR2202, reinstate prop 187, waterboard all of them!!!

crewchief22

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« Reply #15 on: December 28, 2008, 07:08:29 AM »
Dozzr is the person that needs to post info on this subject.  Here is a link to some of the work he had done.

http://www.socaljetboats.com/index.php?topic=3513.msg49467#msg49467
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