Horsepower/Torque estimate

Old June 5th, 2018, 07:53 PM
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Horsepower/Torque estimate

455 standard bore.

9.5:1 compresssion

Comp cams 280H - 230 int/230 exh @ .050. .490 lift on both. 110 LSA.

J heads with stock rockers and Comp Cams double valve springs. Pocket ported. Heat risers plugged. Otherwise stock.

Edelbrock Performer

870 Street Avenger

Headers

Stock HEI




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Old June 5th, 2018, 08:28 PM
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350hp/470lb-ft of torque
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Old June 5th, 2018, 08:38 PM
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I would guess about 350-375 HP and maybe 470-480 ft/lbs of torque. But, a dyno run would be the judge.
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Old June 5th, 2018, 08:42 PM
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I am curious - are those estimates crankshaft numbers or wheel numbers?
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Old June 6th, 2018, 08:18 PM
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My estimates are based on Crankshaft numbers, not a chassis Dyno


My guess on a chassis Dyno would be based on what transmission, torque converter diameter and stall speed (and brand), and what rear differential is being ran (GM or FORD and diameter), and what tires and air pressure is being ran.

On a chassis dyno, running a GM400 trans, a 2500rpm 11 inch converter (decent TCI or better), and an 8.5 inch 10 bolt with 3.42 gearing and 27 inch tires with 35psi..... I would guess ........... 250-270whp/350lb ft
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Old June 8th, 2018, 09:31 AM
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I agree, around 370 at the crank with 460-470 lbs/ft torque. It sounds like a stout reliable machine!!!! The one thing that really pumped my H.P. and Dyno numbers up were a Lunati Voodoo hyd. roller cam, icon pistons (10:5/1) Edelbrock heads for hyd. roller and an air-gap intake. They all work well to the tune of 531 H.P. and 576lbs/ft torque at the crankshaft. Both figures came in at a fairly low RPM. Wayne
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Old June 8th, 2018, 02:56 PM
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What carb and which VooDoo cam?
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Old August 28th, 2018, 06:51 PM
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Got this engine running. Only been around the block but very pleased so far.

However ended up using an Erson cam and didnt block the heat risers. Also using a 1 spacer under the carb, and used a block with 60 over bore

Cam is a single pattern 228 @ .050 with .504 108 LSA. Degreed in at 104.5. Very happy with it.

Last edited by VinMichael; August 28th, 2018 at 06:59 PM.
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Old August 28th, 2018, 07:00 PM
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nice what car is it in ?

I was super happy w my 455 after running a stock 72 350 for several years !!!
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Old August 28th, 2018, 07:29 PM
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Originally Posted by RetroRanger View Post
nice what car is it in ?

I was super happy w my 455 after running a stock 72 350 for several years !!!
Its in a 1964 cutlass F-85 2 door. Bought some very clean SS1s for it with beauty rings this weekend.

You and me both! I tell people the same thing. I bought the car with a very average 8:1 350 when I was 17 and thats what stayed there. Never even driven a 455 until now.
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Old February 8th, 2019, 01:21 PM
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This week I picked up a set of Edelbrock heads part number 60519 on Craigslist. They are brand new and never been out out the box.

I have a set of PRW steel 1.65 ratio rockers for them.

Does anyone have an estimate for what the gain would be after swapping the heads? It runs good but want more.

Oh and I ended up going with a slightly different cam. Erson 228/228 @ .050, .504 lift, 108 LSA. Installed @ 104. And ended up using a .060 over block.

Last edited by VinMichael; February 8th, 2019 at 01:29 PM.
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Old February 8th, 2019, 02:14 PM
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Originally Posted by VinMichael View Post
This week I picked up a set of Edelbrock heads part number 60519 on Craigslist. They are brand new and never been out out the box.

I have a set of PRW steel 1.65 ratio rockers for them.

Does anyone have an estimate for what the gain would be after swapping the heads? It runs good but want more.

Oh and I ended up going with a slightly different cam. Erson 228/228 @ .050, .504 lift, 108 LSA. Installed @ 104. And ended up using a .060 over block.
congrats on picking up some good heads for a good price (I bet)!

i would guesstimate you will be closer to 420-430 Hp now if the compression is 9:1
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Old February 8th, 2019, 04:04 PM
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Originally Posted by Battenrunner View Post


congrats on picking up some good heads for a good price (I bet)!

i would guesstimate you will be closer to 420-430 Hp now if the compression is 9:1
thanks man, yeah I paid $1,000.

Good point the comp ratio will be higher, I forgot they have 77cc chambers.

I can add a .027 head gasket while Im at it. Then compression will be 10 - 10.2:1


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Old February 8th, 2019, 06:08 PM
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[QUOTE=VinMichael;1153475]
thanks man, yeah I paid $1,000.
Good point the comp ratio will be higher, I forgot they have 77cc chambers.
I can add a .027 head gasket while Im at it. Then compression will be 10 - 10.2:1

Every little bit helps!
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Old February 8th, 2019, 08:38 PM
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Originally Posted by VinMichael View Post

thanks man, yeah I paid $1,000.

Good point the comp ratio will be higher, I forgot they have 77cc chambers.

I can add a .027 head gasket while Im at it. Then compression will be 10 - 10.2:1



Wow! awesome deal!

Yes, get the quench tighter and increase compression as much as you can,

you might be in the 450hp+ range at that point, depending on how far below deck your pistons are and how good the tune is
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Old February 9th, 2019, 09:00 AM
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Originally Posted by Battenrunner View Post



Wow! awesome deal!

Yes, get the quench tighter and increase compression as much as you can,

you might be in the 450hp+ range at that point, depending on how far below deck your pistons are and how good the tune is
Pistons are .030 in the hole right now because I used Silvolite 14cc pistons. Which are shorter rebuilder pistons. I used a Felpro Blue head gasket too so quench it nonexistent.

As for the tune. I have an AEM wide band O2 sensor to install once I get the car back from the paint shop.
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