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Old 01-11-2011, 10:19 PM
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71 400 sbc 511 block, any tips? Looking for 600 hp

I have a 1981 berlineta came stock with 305. I have a 400 cid 511 block and 493 heads. Wanting to reach 600hp n/a. I have heard bad things about the head castings. I am looking for head and cam combo information. Any 400 info or tricks are always helpful. Should i get different heads? Cam size, valve size and carb size combos would be great.

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Old 01-11-2011, 10:52 PM
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600 horsepower. I think you might want to rethink this a bit. First off, if the block is a 4 bolt main it`s weaker in the main webbing area. Second, reaching 600 horses isn`t a matter of getting a set of heads and a cam. Reaching that power number means you must be rather wealthy. The bottom end is going to have to be beefed greatly with splayed main caps, plus a aftermarket forged crank, stout aftermarket rods, forged pistons. The heads will have to be high dollar aftermarket, something with about 230cc runners. A solid roller cam would have to be used. It won`t be streetable. Is your camaro stock? if so this means were talking sub frame connectors, plus a mini roll cage to keep the car from flexing. a Ford 9 inch rear would be a have to, along with a beefed Turbo 400 transmission and around a 4500 Stall converter. In the end were talking well over $10,000. However, you didn`t mention is this going to be a race car or a street car? You also didn`t mention if what you posted is the extent of your rodders knowledge. If what you posted is all you know then I suggest you learn far more before trying to jump on something with that much power. Lastly, I have to ask how old are you? As I`ve seen many youngsters post a identical question to yours in the past. If your a young man, then I`ll give you the same advice I gave them. Learn to do engine mods and learn what terms mean as far as camshafts, intakes, carbs, etc.
Then slowly do a build up and learn as you go. And as you go learn to drive and handle it, you can`t enjoy your camaro dead or in a wheel chair.
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Old 01-12-2011, 12:59 AM
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I think he's just shooting the breeze. 600hp naturally aspirated . To much money for me to even think about and im a nurse by profession
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Old 01-12-2011, 10:45 PM
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not shootin the breeze.

I'm 33 and have been working on cars for 20 years. Starting from the ground up. I haven't built my own engine but have done everything else. I have read articles and forums which state that 450+hp is possible n/a. I want to push the envelope a bit. I'm not afraid to work for it. I'm looking for a little advice to reach my goal or get close to it. I know some of you guys think i'm a little wet behind the ears but believe me i have what it takes to handle the car. Had a 370 hp trans am. My end goal is a car i can drive on the street and take to the track and actually compete.
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Old 01-12-2011, 10:53 PM
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Turbo(s) would keep you on the streets and competitive on the track. Keeping boost low @ around six or eight psi would put you right where you wanna be and all i would suggest is going to a dish piston for blow-by purposes.
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Old 01-13-2011, 01:25 AM
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I agree with what ^^^^ said. To be streetable at 600 horses you`ll have to have something with some boost.
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Old 01-13-2011, 08:58 AM
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If money isn't a problem, sure, it can be done. Push the envelope? 600 HP is more than pushing the envelope, handling the car isn't the issue, and 370 HP isn't much of a measure when looking at 600+.

I think $10k is conservative, I have twice that in a relatively tame blown 383, motor alone, $3k in a spragless T400, Griner brake, $500 in the S/N shifter, and a ton more in the frame, back half and 4-link. The total to date, if I posted it, would make my grand children sad... A 600 HP NA motor is going to be even more trick. Good luck, keep us posted.
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Old 01-13-2011, 09:25 AM
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Quote:
Originally Posted by 81camaro400
I have a 1981 berlineta came stock with 305. I have a 400 cid 511 block and 493 heads. Wanting to reach 600hp n/a. I have heard bad things about the head castings. I am looking for head and cam combo information. Any 400 info or tricks are always helpful. Should i get different heads? Cam size, valve size and carb size combos would be great.
the reason some of the comments were made, is you say you have a berlineta,
and you want to put 600+ hp in it, with no mention of any other mods. or parts on the car.
you understand why many would naysay you

as long as you understand that there is way more to having a 600+hp car
than just having a 600hp motor (unless you just want to stay in the driveway)

it sounds like it would be a fun car to build and drive
but doing it n/a will be tough, but not impossible.
you came to the right place for some help to get it done.

i would also recommend some kind of turbo or supercharger,
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Old 01-13-2011, 09:36 AM
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see if you can pawn off that block and set of heads before you get started, they're not even close to being what is needed for 600hp.

You also have to state your intended usage, fuel, maintenance intervals etc.

If its a drag only engine I would run a 400ci little M block with a set of 235cc heads, ported Super Victor intake, a solid roller with about 260-270 duration @.050", 14:1 compression and run it on E85.

For a reliable 600 na hp expect an initial price tag around $15,000 and at least annual rebuilds.

There is a HUGE step from 500hp to 600hp when it comes to cost.
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Old 01-13-2011, 10:19 AM
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Go big block.

I saw a GM 502 12496962 on closeout for less than $8000, which included carb and dist. Makes 502hp with a tiny hyd roller. Streetable compression at about 9.7:1

The ZZ572 is also going away and on closeout at less than $15,000 but with 720hp and 12:1 compression.
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Old 01-13-2011, 10:25 AM
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way more info on the intended use of the car, would make a big difference on the amount of info you receive, that will actually be useful for you to achieve your goal
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Old 01-13-2011, 10:48 AM
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600 HP is just begging for a better block like a Dart SHP block. To get near 600 HP NA you will need 12-13 to 1 compression, GOOD heads, and a stout solid roller cam.

tom
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Old 01-13-2011, 11:09 AM
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Want to drive the car on the street, drive it to the track, and be able to compete. Compete in what class? Being competetive at the track usually precludes driving the car on the street.
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Old 01-13-2011, 11:18 AM
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Sell the 400block and buy a complete rebuildable 454.

A 600hp naturally aspirated 468cid 10:1 cr BBC that runs on pump gas
with full reliability is dirt simple.

A 800hp low 7.5:1 compression, 871 supercharged 468BBC that runs on pump gas is dirt simple.

You'll go faster for a lot longer, for less, in the end.

The BBC motor platform is a lot stronger.
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Old 01-13-2011, 12:57 PM
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I was wondering why it took so long for someone to mention a BBC.

600hp is more than possible in a SBC, but it won't be reliable and it most definitely WILL NOT be streetable, or even practical in the least.

A stout 454 can handle 600hp easily. Despite what the ricers say, there truly is no replacement for displacement, and in this case, bigger IS better in both the displacement and the overall strength of the block and rotating assembly.

Of course, you also will have to take into account the fact that you will need a well built TH400 to back it up, you will need to change out the factory 10 bolt rear, and do various things like suspension upgrades as well as all new stock replacement parts for the things that don't need to be upgraded under the car. I don't know about you but the thought of 600hp and 30 year old steering components scares me.
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