455 Olds vs 454 Chevy

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OC.Hockey.Legend

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« on: February 26, 2017, 08:55:30 AM »
I'm currently buying a boat with a 454 Chevy in it but I have a rebuilt 455 Olds sitting in my garage.  Which engine is better for towing skiers?  I feel like the 454 is better only because parts are easier to come by and cheaper but the 455 has more workhorse power.  Should I leave the 454 in the boat or replace with my 455?  Thoughts?  Oh and it's a 21' open bow commander boat.


GT Jets

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« Reply #1 on: February 26, 2017, 09:03:32 AM »
You would be taking a gigantic step backwards putting a Old's in place of a 454.

The 454 is superior in almost every possible way. Sell the Oldsmobile and keep the money to spruce up the 454.

JMO

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  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

OC.Hockey.Legend

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« Reply #2 on: February 26, 2017, 09:09:15 AM »
I love opinions!  I'm more curious about why.  What's the difference in torque and so on.  If you don't mind explaining.  The funny thing is I am good at rebuilding engines and what not I just don't know which one is which and why they function differently.

GT Jets

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« Reply #3 on: February 26, 2017, 09:32:44 AM »


I love opinions!  I'm more curious about why.  What's the difference in torque and so on.  If you don't mind explaining.  The funny thing is I am good at rebuilding engines and what not I just don't know which one is which and why they function differently.

Three major factors make the Rocket inferior to the Rat.

The first and most defined is the poor oil return inherent to the Old's. This typically requires some oil flow modifications to make it reliable. This has been covered a bazillion times, so I won't get into it here, but let's just say to get them to work properly and reliably is very involved.

The second issue is the Siamese exhaust ports on the middle cylinders, it's sometimes a challenge to keep the exhaust sealed up on those cylinders. You need to run then a bit fat on fuel to judo the exhaust cooler on aluminum manifolds.

The other blemish is the large crank journals, this generates high bearing speeds and with the already poor oil return system, makes them prone to bearing and crank damage.

As for power, the Oldsmobile makes more torque "down low" than the 454 dies I stock form, but the jet pump uses none of it, the punk doesn't "pull a gear" so the torque cones in very late, like above 4,000 rpm, do it makes it moot.


If you add to that, the availability of parts for the Old's versus the Chevy, it's that much more lopsided.....

Hope this helps.

I'm sure others will pipe in that have had an Oldsmobile that swapped to a Chevy.

GT



Sent from my SM-G900V using SoCal Jet Boats mobile app

  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

Cliffjumper

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« Reply #4 on: February 26, 2017, 10:23:15 AM »
You would be taking a gigantic step backwards putting a Old's in place of a 454.

The 454 is superior in almost every possible way. Sell the Oldsmobile and keep the money to spruce up the 454.

JMO

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I agree here.  Keep the 454 in it and sell the olds. 

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Boats Beer And Boobs Aint nothing better!

69kona

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« Reply #5 on: February 26, 2017, 04:54:00 PM »
I take that  Oldsmobile.... 😁


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69kona

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« Reply #6 on: February 26, 2017, 05:04:36 PM »

Three major factors make the Rocket inferior to the Rat.

The first and most defined is the poor oil return inherent to the Old's. This typically requires some oil flow modifications to make it reliable. This has been covered a bazillion times, so I won't get into it here, but let's just say to get them to work properly and reliably is very involved.

The second issue is the Siamese exhaust ports on the middle cylinders, it's sometimes a challenge to keep the exhaust sealed up on those cylinders. You need to run then a bit fat on fuel to judo the exhaust cooler on aluminum manifolds.

The other blemish is the large crank journals, this generates high bearing speeds and with the already poor oil return system, makes them prone to bearing and crank damage.

As for power, the Oldsmobile makes more torque "down low" than the 454 dies I stock form, but the jet pump uses none of it, the punk doesn't "pull a gear" so the torque cones in very late, like above 4,000 rpm, do it makes it moot.


If you add to that, the availability of parts for the Old's versus the Chevy, it's that much more lopsided.....

Hope this helps.

I'm sure others will pipe in that have had an Oldsmobile that swapped to a Chevy.

GT



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I'm a olds lover .. I run bbc Chevy rods in my Oldsmobile ..... Last motor  lasted 8 years . You have to do your homework to make them 455 last . If if I where u I would Just throw a 454 in there and be done with it .  So much easier to build


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OC.Hockey.Legend

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« Reply #7 on: February 26, 2017, 07:40:22 PM »
I take that  Oldsmobile.... 😁


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How much do you want to buy it for? ;)

69kona

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« Reply #8 on: February 27, 2017, 07:45:53 AM »

How much do you want to buy it for? ;)
Who built it?


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Chad krieger

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« Reply #9 on: February 27, 2017, 01:47:32 PM »
Ok this is what I would do run the Chevy and build the 455 up so when the Chevy goes out u can be back on the water quick.



GT Jets

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« Reply #10 on: February 27, 2017, 02:43:03 PM »
Ok this is what I would do run the Chevy and build the 455 up so when the Chevy goes out u can be back on the water quick.
Or, turn the 455 initio cod hard cash and build the bowtie right so it simply can't puke.




GT

Sent from my SM-G900V using SoCal Jet Boats mobile app

  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

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« Reply #11 on: February 27, 2017, 10:27:48 PM »
Don't forget all the parts it would take to do the swap. Do you have thru-hull exhaust? The holes will probably be in different spots on the transom. An Olds is a few inches wider than a Chevy. Will your interior accommodate it (jumps seats next to engine doghouse)?

It can be done but at what cost (money and time)?

Timminator, the guy that wrote the Olds article, also wrote an article about repowering and made some great points.

An Olds can be a great engine with a lot of power. A Chevy is just better engineered for it.

Coming from a guy with an Olds, run the chevy that's in it. Cash out on the Olds.
Or buy a cheap hot rod hull less engine and drop in the Olds for fun.  >:D

JordanDangerfield

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« Reply #12 on: February 28, 2017, 08:32:11 AM »

Don't forget all the parts it would take to do the swap. Do you have thru-hull exhaust? The holes will probably be in different spots on the transom. An Olds is a few inches wider than a Chevy. Will your interior accommodate it (jumps seats next to engine doghouse)?

It can be done but at what cost (money and time)?

Timminator, the guy that wrote the Olds article, also wrote an article about repowering and made some great points.

An Olds can be a great engine with a lot of power. A Chevy is just better engineered for it.

Coming from a guy with an Olds, run the chevy that's in it. Cash out on the Olds.
Or buy a cheap hot rod hull less engine and drop in the Olds for fun.  >:D

Good point about the cheap hull. There are a lot of 18's out there with a blown up Olds sitting in them.


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Atomic Wedgie

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« Reply #13 on: April 06, 2017, 01:24:04 PM »
I just decided to pull my 455 in favor of a 469 BBC...just tired of dumping money in the Olds. Seems like there is always some gremlin or other that keeps rearing it's ugly head.
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