Thread: 800 horse355

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I under stand what your saying but i have heared of people making 1,000 horse small blocks out of prduction blocks with a good forged rotating asembaly and 200 or 300 horse of nitrise. I am not saying your wrong Im just saying it is posible to do it with out $15,000 or $20,000 it is just the reliability that is at stake then.

hah jesh.. i thought i was outgoing with asking about a 500 hp small block.. lol... 800 wow... ... and as you say uve seen a couple of guys with 1000 hp small blocks.. well possible.. but how long do they last... do they drive them on the street.. no... are they trailer queens... yes... if you want a high power engine.. go turbo... this way you can adjust your boost to when you want to go fast and turn it down when its on the street and geting the mileage... itll take more .. but ur engine will last much longer .. trust me.. take a look at hpperformance.com... some of the vids... well they took a (sorry ford.. ) mustang with a bolt on kit.. completely stock and made 450 plus hp... and the guy still drives it with 110000 miles on it.. some of the built up ones... theres a guy with a 1300 hp mustang and when drivin interstate and such.. he gets 20 MPG!! while racing every car that toys with him.. but check it out.. its quite cool.. (turbos are the way to go)

If you can get 800 h.p. out of a 350 that you built in your garage, I'll worship you as a god. I thought the 700 hp 383 was exagerrated. I'd be tickled freakin peachy keen to get 350 out of mine, and I'd be content with 325. I'd say an 800 horse 350 is out of reach for what someone can do in their garage.

its not out of reach hell i could build a 650+ horse 283

How long ago was it that 1 H.P./1 cu. in. was a holy grail, in this case 355 H.P.? Maybe you can take a look a few dyno tests here:

http://www.ryanscarpage.50megs.com/combos1.html

It would seem that NASCAR engines run in the 700-800 H.P. range in the 358 cu. in. limit but they have to turn high rpm to get there, remember that

H.P. = Torque (ft. lbs.) x (rpm/5252)

so if the engine can turn 6500 rpm or more, high H.P. is attainable, BUT then you have to sweat out a LOT of details to keep the engine together at high rpm for a long time. Note many drag racers replace a lot of engine bearings between runs but NASCAR engines have to stay together for about 500 miles at high speed. It also would seem it is easy to get 350 H.P. from a SBC 350, but if you look at the dyno curves the higher the peak H.P. the more the low rpm torque suffers and high rpm engines then need high stall speed torque converters to get up into the good torque range. Then again Nitrous looks enticing or even a positive pressure supercharger, but then you better have good rods and a strong bottom end, so there are a lot of tradeoffs. It does seem that many NASCAR engines can achieve 800 H.P. at high rpm but there are many expensive parts and a lot of trade secrets involved to get there. After you look at the Ryans Dyno list maybe you could work toward 400 H.P. realistically, but even then with normal aspiration, the low rpm torque may fall off and you will have to run a big (long duration) cam which will reduce the low rpm torque. If you have a lot of 350 blocks why not try to do the slight grinding and buy a 383 stroker kit. If you mess up one block by grinding the clearances yourself you can just call that a learning experience and do a better job on a second block, however in my experience this kind of "learning" is also expensive. Well anyway have fun and build something after you study the Ryan's Dyno Set.

Don Shillady
Retired Scientist/teen rodder

Originally posted by gassersrule_196
its not out of reach hell i could build a 650+ horse 283

and have on many occasions, right Scooter???

500 miles on a nascar engine is reliable too, but on a street 500 miles leaves you stranded.

...Bill Mitchell has an 800 H.P Big Block Crate Motor for $17 grand. Just use it. Cheaper and more dependable than the small block that your planning..... Bill

[QUOTE]Originally posted by robot
"[B]Joe, what Dave is trying to explain to you is that the $34,000 motor is typical of what it takes....regardless of who builds the motor. We have over $200,000 in equipment here and we CANNOT build those motors! It is not trivial. IF you see an item in a catalog, THAT item is NOT what you need for an 800 hp motor. Callies cranks are not cheap, Carillo rods are not cheap, the blocks are NOT something you make from a factory casting."

Then when you have the $200,000 in equipment that Robot has, you will need to spend another $100,000 on a Super Flow dyno with the computer interface to analyze your progress on the motor. Trust me, your first motor will not be the 800 hp your wanting. Also during your research time to get your 800 hp non nitrous motor you're going to gernade a few right on the dyno checking out various combinations.

Just because somebody, either in an ad or on a website, claims the big horsepower numbers, I would be skeptical of it. Unless I was there in the dyno room when they made the pull, or it was put together by an engine builder that I knew and trusted, I would not necessarily believe some of these extravagant claims. Also, as Robot said, these parts don't come out of a Summit or Jegs catalog. I recently got to see, feel, and touch a pair of 427 tunnell port heads by Dove Engineering at $1200 each bare. They will take another $1,000 to put together, but before they even go together the could use about $500 worth of time on a flow bench. Oh yeah, the tunnel port tunnel ram intake to go with them is another $2500 plus the much modified Dominator carbs that go on top of that.

Don't ever let anybody talk you out of going after a big hp small block, just approach it with your eyes (and checkbook) wide open. And don't expect the parts to be readily available by mail order thru the "discount" parts houses.

hey joe,

I suggest buying some books, subscribe to magazines, i think its possible, and in your garage too, your gonna need forged parts, low compression, top of the line heads, and a very big turbo, also a blow through carb instead of your average carb, you have to remember this is not gonna be cheap or easy, but i say try it and see what happens, i mean would you really be disappointed if you put it on the dyno and only got 700??


good luck

nova

My question is what are you planning to do with this 800 hp 355? You mentioned a truck, are we talking street? Drag strip? Drifting? If you are succesful building that motor ,what about the chassis for your truck to put it to good use?

What is it you want to do that you need 800 hp for?

Pat

ok 800 hp 350 seems a long way off. just was reading car craft today, they used a stock bottom end 350 domed pistons dart 215 cc small chamber heads,comp cam and were able to squeeze over 500 hp at 6800 rpm.
pretty strong but screaming . i dont know how long the bottom end would last at that rate. the same motor put out 497 at 6000 and 424 at 5000 down to 312 hp at 3000
not exactly a street friendly kind of engine lots of compression.
you can only get so much out of 350 cubic inches.

My truck is a 1972 chevy made primarily for the bogs. Its just a straight shot with it right to the floor trying to get to the other side. So higher rpm is beter since you need as much wheel speed as posible. Yes I could go with a big block with high low end torque and higher gears, but I have so many 350's. Having that much power is no real bid deal. I already have 2 1/2 ton rockwells and 44 inch tires the only thing I would have to do is the trany. I have a th350 now but iam shure it wouldnt handle it.

I would sell all the 350's and use the money to build a BBC. All those 350's are stock (I assume) so very few parts will do you any good building 500 H.P. You could build a milder BB to get the needed H.P. = more reliable.

Very good point and I just may do that.