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Old 06-02-2010, 04:23 PM
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383 stroker kit

I am building a chevy 350 L89. Just purchased a 383 stroker kit. Trying to get about 450hp. Polished and ported heads. Is there a certain cam,lifters, and rollers I need to acheve this much horsepower and is it possible to get 450hp?

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Old 06-02-2010, 04:40 PM
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Quote:
Originally Posted by Claude Authement
I am building a chevy 350 L89. Just purchased a 383 stroker kit. Trying to get about 450hp. Polished and ported heads. Is there a certain cam,lifters, and rollers I need to acheve this much horsepower and is it possible to get 450hp?
Mine is supposedly making around 470, but one thing I learned is its 70% heads. This porting and polishing hoohaa, ya theres some ponies there but your better off with a set of edelbrock heads and let that puppy flow. If you cant swing those and can get a set of vortecs on the cheap thats not bad either but almost the same dollars by the time they've been reworked and your not having the benefits of aluminum. I'm no salesman for Vic but for the price. Cause its like this friend if your heads aint flowing to max all the cam ,carb and compression numbers in the world dont mean a whole lot.Let me explain it this way. Engines just a big pump, wherever theres a restriction in flow that becomes the weak link and sets the standard as to how the rest flows. Aluminum also offers better cooling, absorbs any detonation better,etc etc

PS. For that much HP out of those cubes your talking some substantial cam..Do yourself a big favour and take flat tappet off your list.

what rear gears? what tranny?
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Old 06-02-2010, 07:19 PM
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Quote:
Originally Posted by Claude Authement
Polished and ported heads.
Claude, try not to use this phrase around rodders who have enough experience to know that it's left over from the 50's when we used to "port and polish" on flatheads. In today's engine building, there may be some slight advantage to shining up the exhaust ports, but the intake ports should be left rough. Just saying "my heads have been ported" will suffice.

There are many ways to gain 450 hp from a 383, however, none of them are particularly cheap. Sooper hit the nail on the head with his explanation of cylinder heads. That's the key. That's where all the power is. That's where you want to spend your money. I don't see getting anywhere close to 450 with production heads. You're gonna have to bite the bullet and lay down some long green (moola) (shekels) for a good set of heads that will support the hp you want.

Here are 109 small block Chevy combinations that were assembled from magazine dyno tests. Scroll through them and you'll start to get an idea of what it takes to make 450. All of these motors were assembled with a pump-gas-friendly static compression ratio. Just click on a different group of pages at the bottom of each page....
http://www.ryanscarpage.50megs.com/combos1.html

Just so you know what it costs to assemble one of these motors, here are a couple of examples of 450 hp crate motors with pricing....
http://cgi.ebay.com/ebaymotors/ws/eB...d=300427456610
http://www.race-mart.com/items/produ...32A-detail.htm
http://www.proformanceunlimited.com/...0_economy.html
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Old 06-02-2010, 10:20 PM
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Ryans car page has many combos, been reading it myself trying to study each combo. Good stuff I'm also trying to achive your goal. Tech inspector I have a question. Im going to run a 383 also with port matched and polished trick flow g-2 heads, 190 runners and 67 cc. My cam choice is a xe274h or xe282hr both are 230/236 @ .050. 10-1 comp with a victor jr intake. The stall will be 3,000. With out to many details does this combo sound fair ???
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Old 06-03-2010, 01:57 AM
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Never owned a set of twisted wedge heads, but your mention piqued an interest, so I googled them. Apparently, there were two examples, the G1 (Gen 1) and the G2 (Gen 2). Here is an excellent discussion....
http://www.stevesnovasite.com/forums...d.php?t=117693
and another...
http://www.chevelles.com/forums/showthread.php?t=17310

Now that I have flow figures, I can run a DynoSim. I'll do that tomorrow for you.
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Old 06-03-2010, 05:10 AM
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Quote:
Originally Posted by 66Redrider
My cam choice is a xe274
Google "comp cams XE failures" just for fun
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Old 06-03-2010, 06:45 AM
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Would the xe282hr be the best choice ? The xe274h is a flat tappet made with a cheap alloy and the xe282hr is a hydraulic roller made with a billet core.
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Old 06-03-2010, 09:02 AM
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450hp out of a 383 is not all that hard to achive, i run a 385 that puts out a touch over 500hp and about 490tq that is 10.3:1 and can run on pump gas (93-94 octane). i do run a flat-tappit cam but it is a solid flat-tappit and i spent the extra money on a good set of direct lube lifters. i am not an advocate of edelbrock heads, i presonally prefer steel heads on a car that will see more street time than track time. you guys are absolutely right about the heads though, and tech1 is right about the polishing idea, you want the intake ports more rough for better fuel atomazation. i run a set of the new
DART iron eagle platinum 200cc head that i have had a good amount of machine work done to with all the flow test to compliment and by the time i was done i had over 1700 into the heads but they will out perform any aluminum head under 2000 bucks even the ever popular competition AFR's. out of the box the 200cc DART platinums or the 200cc RHS steel heads will be able to achive 450hp with the right compression and cam set up, and both take very well to some minor machine work it's not hard at all to get an additonal 5-10% flow increase from .300-.600" lift on these heads but you have to be willing to pay the money to have it done.

about the comp XE cams, i almost went with one in my motor but then did some research on them and found they have a very aggressive ramp rate for a hydraulic lifter to be able to keep up with this is what drove me to look into a solid cam
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Old 06-03-2010, 09:14 AM
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Quote:
Originally Posted by 66Redrider
Would the xe282hr be the best choice ? The xe274h is a flat tappet made with a cheap alloy and the xe282hr is a hydraulic roller made with a billet core.
Your HR wont wipe like the xe/h is almost garaunteed to. Their to aggressive for todays oils but comp cams just wont admit it
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Old 06-03-2010, 10:15 AM
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Yeah going to 450HP from 400 lets say is were a big chunk of the money comes in. If you can settle for an honest 400 then you can save a bunch of $$ on heads and get a set of L-31 vortecs that have machined for about .525 lift and maybe some minor bowl blending and you would not be using a big cam say around 220-224 duration at 50. Then you are building a nice street motor, depends what you need/want. As far as the XE cam, I went lunati with my 383. Thing is they too can go flat but its the lack of valve noise that is music to my ears, I ran my 350 with an XE and it never went flat and made real good power but the constant valve train noise was enough to drive me stupid...or stupider.
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Old 06-03-2010, 02:12 PM
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How much duration can I run on a 383 without losing my power brakes ? All cam companies suggest running in the 240's to pull more rpm, but if Im happy running 425-450 horse with a 230/236 @ .050 cam with less rpm's isn't that better on the motor not pulling 6-7,000 rpms ?? I want my car to be a sleeper and don't want to add a vaccum can. Thanks for all the imput guys
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Old 06-03-2010, 02:22 PM
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i run a howards 282/290, 240/250 106cl, 110lsa with .525"/.525" lift with 1.6 billet rockers and i dont have to run a vacuum canister. but for your hp goal of 425-450hp, you wont be able to go below a 230 cam and you will want some decent flowing heads but you should deffinatly be at 425hp, and with my cam i'm shifting at 6200rpm my max power is at 5900 rpm

what are the rest of the specs on the cam, what compression, what heads, etc
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Old 06-04-2010, 04:08 PM
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383 with G2 heads factored by 0.95, 1 3/4" headers, RPM or Stealth, 750 carb, pistons with 12cc dish, 9.98:1 static compression ratio, CompCams hyd. roller 12-432-8, 8.518:1 dynamic compression ratio according to KB's calculator.
http://www.compcams.com/Cam_Specs/Ca...?csid=160&sb=0
RPM HP TQ
2000 147 387
2500 187 393
3000 241 421
3500 305 457
4000 365 480
4500 416 486
5000 457 480
5500 477 456
6000 480 419
6500 441 357
Peak volumetric efficiency 99.5% @5000
Peak BMEP 191.5 @4500
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