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Old 05-01-2017, 06:18 PM
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Quote:
Originally Posted by trent gross View Post
anyone got a desktop dyno they can punch my setup into? its a 400 sbc with 6 inch rods 12.5 cc dished pistons 70 cc heads with 10/1 compression profiler 210cc heads with 205 intake valve and 160 exhaust erson cam e110044 480 lift 230 duration @ .050 108 lobe separation 1.5 rockers sanderson 1 5/8 block hugger headers.. summit stage 3 dual plane high rise intake with 750 cfm carb hei distributor .. thanks in advance
ok did fail to mention this is a 75% street car / driver I already have all the parts listed above except the hydraulic roller cam just would like an honest estimate on hp...... better yet will my combo with a roller cam under 550 lift make 450 streetable hp

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Old 05-01-2017, 06:25 PM
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Quote:
Originally Posted by trent gross View Post
ok did fail to mention this is a 75% street car / driver I already have all the parts listed above except the hydraulic roller cam just would like an honest estimate on hp...... better yet will my combo with a roller cam under 550 lift make 450 streetable hp
Yes IMHO.

75% street definitely means dual plane intake. You aren't going to maximize those heads with a 750 carb and 1 5/8 headers. They are a little overkill. The 195's would've been a better fit IMO if you're keeping it on the street. The 210's should support close to (or more than) 7000 rpm's on a 400 out of the box. What I'm saying is you're going to run out of carb and header long before you see the best of those heads. They were the reason that I recommended more cam in my first response - I assumed you knew they would support 500+HP .

Last edited by 64nailhead; 05-01-2017 at 06:41 PM.
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Old 05-01-2017, 08:05 PM
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Originally Posted by trent gross View Post
550 seems like a lot for my set up, I was hoping for 400 plus maybe 450, but I will take all I can get thanks
Yep. Take note of who told you that and think hard about other advice every other poster has issues with. Do your homework, weed out the garbage.
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Last edited by 68NovaSS; 05-01-2017 at 09:04 PM.
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Old 05-01-2017, 08:34 PM
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Quote:
Originally Posted by 64nailhead View Post
Yes IMHO.

75% street definitely means dual plane intake. You aren't going to maximize those heads with a 750 carb and 1 5/8 headers. They are a little overkill. The 195's would've been a better fit IMO if you're keeping it on the street. The 210's should support close to (or more than) 7000 rpm's on a 400 out of the box. What I'm saying is you're going to run out of carb and header long before you see the best of those heads. They were the reason that I recommended more cam in my first response - I assumed you knew they would support 500+HP .
Forget the Air Gap intake for a streeter, use a closed body such as an Edelbrock 7101 or Weiand 8150. I have had reports from some fellows concerning drivability problems with an Air Gap on the street. And even if it did produce a little more hp than a closed intake, how much could it be ?????? Less than 5 hp I would bet, after much fiddle-farting around getting it tuned.

Here is the best I could do with the current static compression ratio, which is 9.98:1 by the way, using zero deck and a 0.041" gasket (Fel Pro 1003). I used a Howards roller hydraulic #CL-116115-10, retarded 2 degrees. Rough idle, street/strip, strong mid-range, 2500+ converter. 0.600" intake lift, 0.580" exhaust lift, Intake centerline 106 degrees ATDC, Exhaust centerline 114 degrees BTDC, Lobe separation angle 110 degrees. Operating range 2600-6500.
Installed 2 degrees retarded as follows....

Intake valve opens 9.5 degrees BTDC @0.050" tappet lift
Intake valve closes 45.5 degrees ABDC "
Exhaust valve opens 51.5 degrees BBDC "
Exhaust valve closes 7.5 degrees ATDC "

The following numbers were factored by 0.95 to more closely match reality....
RPM......HP.......TQ
2000.....155.....408
2500.....196.....411
3000.....253.....443
3500.....323.....484
4000.....391.....513
4500.....452.....527
5000.....495.....520
5500.....519.....495
6000.....526.....460
6500.....485.....392

Max volumetric efficiency 98.7% @5000
Max BMEP 198.2 psi @4500

1 3/4" race headers through hi-perf mufflers.
.

Last edited by techinspector1; 05-01-2017 at 08:57 PM.
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Old 05-02-2017, 04:05 AM
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Trent,
You can see from Tech's dyno sim that 500HP is more than attainable with a better header than you have and a cam with a little more lift. Implying you should be able to make your goal of 400 with your eyes closed IMO.

The best part is the low rpm needed to accomplish it, the advantage of the 'big' 400 sbc
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Old 05-02-2017, 05:01 AM
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now those are the answers I was looking for and I thank yuns all very much for your help,i cant afford to change my setup now cause I have spent over my budget on the scat crank and rods and forged pistons and heads , gonna have to borrow the cash for the roller swap, but I really thank all of you for your advice
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Old 05-02-2017, 05:03 AM
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I use a .039 head gasket is where I got 10/ 1 ratio, and thank you again
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Old 05-02-2017, 06:50 AM
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with the .039 head gasket make sure the deck is zero?
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Old 05-10-2017, 10:05 AM
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When you go to decide on your roller cam and such make sure you really think about what your going to do with your vehicle and what your wanting from it and be careful to not let all the magazine ads and catalog sayings lead you in the wrong direction and also I have been where your at before many eons ago and I always dreamed of having all the big bragging rights of having 500 plus horsepower under the hood and in ways yes its something to feel cool about it but honestly make sure this is the route you really want to go with as the more power you get then there is also a bigger amount of trade off you will loose as well.

Street manors and fuel mileage along with how your engine performs depends on many factors such as the vehicle being used and its weight and how it is setup along with the type of transmission and rear gears along with the engine specs from top to bottom with the heads and camshaft matching and pretty much everything in the entire driveline will effects many different aspects.

Don't fall for the needing the biggest of cams and carburetors and intake manifolds and other things as sometimes too much is that and you might want to educate yourself on the effect of using cylinder heads of the different intake port sizes of say 180cc vs 200cc and bigger yet. It is nice to say yeah I have over 500 ponies under the hood but in the end if all you do is just cruise with it and have little to no street manors of any kind then what good will it be?

I once had a stock 350 and put a really big cam in it just to have that hot rod thump thump sound and nothing else and it ran like a dog and I half learned my less on that one. Several builds later and ten years ago this month I went to my first roller cam build and the cam I got was a really nice crane cam and it sounded good and ran good and matched my heads etc but I did not have as much rump rump sound and so once again I went with the magazine hype of comp thumper cams and there saying that it will give great power and still have street manors and I went with the biggest one and boy did I pay the price.

I lost pretty much a whole lot in every way shape and form and ended up taking the cam out and going back to something very similar that I had before. I am just saying before you go to do a hydraulic or solid roller cam swap please do some homework and google searches on carburetor tech and learn how they work and the effects of having too small of a carburetor and too big of one and the effects of compression and what ever else there is to learn for basics so you can do it really close the first time to what you will actually want and be happy with and not saying I have this x amount of power.

Please don't take anything in the wrong way as I am just sharing my experience and bad choices that made a nice build or a somewhat not fully matched build. My current build I am working on is going in a 96 chevy s10 and is going to be a 350 dart shp small chevy and I have a 650 double pumper going on top with a weiand 8150 dual plane intake high rise and running dart 200cc iron eagle platinum heads 72cc chambers and my block will be decked while running a felpro 1003 head gasket to get a tight quench of about .041

I am getting a custom made camshaft hydraulic roller from jonescams with 276/280 228/[email protected] 50 540/540 lift and a 110 lsa with a scat forged rotating assembly and flat top pistons and I should be a little over 9:3 to 1 and I will have my heads checked and shaved some if needed to make sure for a true flat surface. I am getting a 2500 to 2800 stall convertor and I have a posi unit in the rear with 3.42 gears and I cruise down the highway at 70 mph and turn over 3100 rpm with my turbo 350 transmission so like that I am in the good cruising range of my build and get what I need out of my engine.

I am only looking for just making over 400 hp and I know with a bigger cam and bigger carb and even more compression I can get much more power but in a tiny s10 even with a stock vortec 350 it don't take much to move one so I am leaving some power on the table with a slightly smaller carb and not the biggest power making roller cam I can get etc and going the stroker route or even going with a 400 plus cubic inch build cause I don't need all that since I don't race at the track or on the street of any kind and mine is built to be simple with some performance along with street manors and still some decent power for what my little truck is setup for.

Make sure to put down on paper different options for going with a roller cam and make sure to know more about things as it will help a bunch when it comes time to make that choice as trust me getting the wrong cam for the wrong reasons will end up at many times making for an expensive lesson. Good luck on your build.
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