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Old 04-01-2013, 09:20 PM   #1
studillac tom
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Default 54 331caddy vs.55 331 caddy

Anyone help me out with the reason why a 54 331cu in caddy has 230hp and the 55 331cu in caddy has 250hp I have a 54 Bill Frick Studillac rebuilding the eng. and would like the extra 20 hp. I also have tri power so maybe I'd wind up with 260hp Could it be heads and if so could my heads be modified to 55 specs.?
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Old 04-01-2013, 10:24 PM   #2
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Default Re: 54 331caddy vs.55 331 caddy

I have also been looking into this, I have a 1952 Cadillac and looking to hotrod my 331. I did read a really good thread. There is a spreadsheet by c322348 found here.

http://www.jalopyjournal.com/forum/s...adillac&page=3
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Old 04-02-2013, 08:19 PM   #3
studillac tom
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Default Re: 54 331caddy vs.55 331 caddy

Thanks skidmarks This is a period piece (54 motor 54 car) the 390 heads may fit but my value covers won't fit the 390 heads
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Old 04-02-2013, 08:59 PM   #4
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Default Re: 54 331caddy vs.55 331 caddy

Quote:
Originally Posted by studillac tom View Post
Thanks skidmarks This is a period piece (54 motor 54 car) the 390 heads may fit but my value covers won't fit the 390 heads
???????? '54 valve covers will fit heads through 1962.
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Old 04-04-2013, 10:28 PM   #5
studillac tom
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Default Re: 54 331caddy vs.55 331 caddy

It's kinda like a numbers matching eng. There are only a few know Bill Fricks Studillacs maybe 3 or 4 I have one of them and really don't want to change the engine However while doing the rebuild if I can get 20 or 30 more horsepower without changing the cu.in. and cam This is what I am trying to do
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Old 04-05-2013, 10:08 AM   #6
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Default Re: 54 331caddy vs.55 331 caddy

Basic rules of hot-rod engine building is that if you want more hp then you need to raise the compression and/or change the cam grind and if you are keeping the somewhat-low oem compression then your cam profile choices will be limited.


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Old 04-05-2013, 10:53 AM   #7
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Default Re: 54 331caddy vs.55 331 caddy

Isn't there an increase in compression ratio over the two years from 8.25:1 - 9:1 that accounts for the hp increase?
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Old 04-05-2013, 01:07 PM   #8
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Default Re: 54 331caddy vs.55 331 caddy

As Speedy notes, the oem c/r jumps from 54 to 55, and thus the 20 hp difference. As someone mentioned, more compression means more hp......

Carbs do not change hp, they do change how the hp is used and what you 'feel' in the throttle...good or bad.

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Old 04-05-2013, 01:30 PM   #9
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Default Re: 54 331caddy vs.55 331 caddy

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What was the first year for dual quads? 55 was the last year of the 331 and did not have an extended shelf
I know that Eldorados had them in '55-'56-'57; in '58, they went with tripower.
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Old 04-05-2013, 01:48 PM   #10
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Default Re: 54 331caddy vs.55 331 caddy

Quote:
Originally Posted by Speedy Canuck View Post
Isn't there an increase in compression ratio over the two years from 8.25:1 - 9:1 that accounts for the hp increase?
Speedy Canuck is right. They did boost the comp ratio from 8.25:1 in 1954 up to 9:1 in 1955
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Old 04-07-2013, 09:29 PM   #11
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Default Re: 54 331caddy vs.55 331 caddy

KO Thank you all for your help and I'm learning things here. I am aware the 55 has more c/r than the 54. And I learned c/r makes HP So how what gives the extra c/r to the 55?
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Old 04-07-2013, 09:43 PM   #12
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Default Re: 54 331caddy vs.55 331 caddy

More compression, different chamber, cam more lift, different LSA, intake, carb , exhaust etc...



It's all explained here starting on page 93.
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Old 04-07-2013, 09:55 PM   #13
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Default Re: 54 331caddy vs.55 331 caddy

Quote:
Originally Posted by skidmarks View Post
Does the early stick flywheel fit the 1955 motor?
I believe its different from 55 onwards due to the loss of the built in bell housing.
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Old 04-07-2013, 10:28 PM   #14
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Quote:
Originally Posted by skidmarks View Post
I thought it had something to do with balance. Is the 55 331 motor completely different from the 49 to 54 motor?
Well I know it doesn't have the in built bell housing, I believe most parts are still interchangeable as the main block is the same.
I seem to remember that post 55 flywheels are the same (manual anyway) - I guess it could have something to do with balance...
I know my NOS shciefer flywheel was only listed for 331 to 54.


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Old 04-08-2013, 07:36 AM   #15
Dale Fairfax
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Default Re: 54 331caddy vs.55 331 caddy

According to Motor's Manual, this would appear to be the correct if not the toal answer. Compression was bumped but they also raised the R.P.M. for rated H.P. from 4400 to 4600. Suggests a slight cam change as well???
(Havent done the torque to H.P. calc but I don't think a simple raise in R.P.M. will result in that much H.P. difference.)



Quote:
Originally Posted by Speedy Canuck View Post
Isn't there an increase in compression ratio over the two years from 8.25:1 - 9:1 that accounts for the hp increase?
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Old 04-08-2013, 04:34 PM   #16
studillac tom
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Default Re: 54 331caddy vs.55 331 caddy

OK So how do I get mt 54 eng. to the 55 specs The cam is the same and i think the carb is also (wcfb) could it be the head on the 55 is milled?
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Old 04-08-2013, 08:58 PM   #17
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Believe the 54/55 heads are the same, probably higher CR pistons. Why not just rebuild it with a better cam, the 54 heads and 3x2 - that would give you a nice bump over the 55 spec


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Old 04-08-2013, 09:14 PM   #18
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Default Re: 54 331caddy vs.55 331 caddy

The changes are documented here; 1955 Cadillac

Over view on page 93
1.65 Rockers, new Carb, New intake, new combustion chambers, dual exhaust, changed lobe centers, 3/4 point more compression.

Specs are about 2/3 down.
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Old 04-11-2013, 10:27 PM   #19
studillac tom
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Default Re: 54 331caddy vs.55 331 caddy

I don't get it The manual stats are the same I guess the heads are milled so the combustion chamber is smaller? causing a higher c/r.
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Old 04-12-2013, 01:07 PM   #20
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Default Re: 54 331caddy vs.55 331 caddy

In a 1956 Hot Rod magazine, an article on the 56 Cadillac 365 mentioned that in 55 Cadillac had redesigned the heads for better breathing and performance. They called them TURBULENT WEDGE heads. These heads were then used on 365 and 390 engines.
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