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Old 05-12-2009, 10:13 AM
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needin some ideas for my 455 rocket id like to get around 700 horses plus

just needin some ideas to get me in the right direction.

thanks

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Old 05-12-2009, 10:26 AM
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Gonna be tough w/o LARGE $$$, and/or power adders (super- or turbocharging, nitrous).

It can be done w/o PA's, but you'll need to max out everything, pretty much.

What's the engine gonna be used for?
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Old 05-12-2009, 11:47 AM
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I saw a build this past weekend on Horsepower TV (I think) that built a 455 up to 456 hp. It seemed they did a lot of machine work / balancing to get it all to come togethor. I'd say that if you're going to naturally aspirate the engine, then it'll be tough to reach your goal... but I'm no expert.
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Old 05-12-2009, 12:28 PM
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Quote:
Originally Posted by bakwoods70_0lds
just needin some ideas to get me in the right direction.

thanks
Start by writing a $15,000 check to Dick Miller.
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Old 05-12-2009, 05:07 PM
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500 horse engine and 200 horse nitrous shot, otherwise prepare to spend $10,000 or more. All of the off-brands(BOP) are expensive.

look for Realoldspower on the web.
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Old 05-15-2009, 02:55 AM
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Quote:
Originally Posted by cobalt327
Gonna be tough w/o LARGE $$$, and/or power adders (super- or turbocharging, nitrous).

It can be done w/o PA's, but you'll need to max out everything, pretty much.

What's the engine gonna be used for?

lookin to make it street and strip so that i can kind putt around in it or let it eat up concrete at drag strip
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Old 05-15-2009, 05:52 AM
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Quote:
Originally Posted by bakwoods70_0lds
lookin to make it street and strip so that i can kind putt around in it or let it eat up concrete at drag strip
Cool. What year is this mill?

What I will propose is to build the engine with as much cam as you can, that matches the CR of the heads you choose to use. Let the HP fall where ever it wants to- the engine's forte is torque, not HP.

The Olds 455 is slightly undersquare (4.125" bore X 4.250" stroke), so huge intake valves ain't gonna happen. The engine is a torque monster, though, and if you build it to compliment its virtues, you'll have some kind of fun- just be sure you're on friendly terms w/the local tire store!

Edelbrock makes a decent, user friendly aluminum head for your 455, they are worth a look. Otherwise, Olds guys like the "A", "B" and "C" heads for HP use, IIRC. With gasket matching and pocket porting, they will up your CR and work fairly well.

FWIW, most don't have hardened exhaust seats (these heads are late '60's- early '70's), but I've never found that to be a big deal.

Compliment that w/a dual plane intake, 750 CFM carb of your choice (don't automatically dismiss the Q-Jet if it's still there- they are GOOD carbs), headers, dual exhaust at least 2-1/2" after the mufflers w/an "X" or "H"-pipe before the muffs, but after the collectors.

Gear ratio for the posi rear end can be in the 3.23- 3.73:1 range and will get the job done- you don't need any steeper- I lean towards the higher end (lower numerically), gear ratio-wise.

Last edited by cobalt327; 05-15-2009 at 06:29 AM.
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Old 05-15-2009, 06:19 AM
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I'd actaulyl say no smaller than 3" duals if you're shooting for at least 500hp. You're either going to need nitrous or boost to get to 700 though, or race fuel- but there goes driving it on the street. Honestly though with all the torque you can create down low 500hp is going ot be a handful on its own. What is this thing going in?
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Old 05-15-2009, 09:19 AM
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I'll second that an NA 700 HP engine will not be fun to drive on the street. I don't care if it's an Olds or a BBC. Build a solid engine (450 HP is easy, 500 HP is not much harder) then add nitrous.
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