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Old 10-11-2009, 11:37 PM
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Help building a 400-450hp 383 stroker

Hey guys I want to get some ideas on how to get 400 or mabey more hp out of a 383 stroker. I want to do it the cheapest way possable but obvi it wont be a 2 grand build. I do most of part searching on sites like Kijji and sites like that so prices dont matter to much but would be nice to have anyway . Ok so i am in the midst of getting a 350 4 bold not shure of the year but has 79 z28 heads. So yea whats the cheapest combo to make a true 400hp with out being a week mess. Also, are there any combos to make a true 400hp with just a 350? and no over boring? Thanks

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Old 10-11-2009, 11:45 PM
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Here are 109 dyno-proven small block Chevy combinations. Knock yourself out......
http://www.ryanscarpage.50megs.com/combos1.html
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Old 10-12-2009, 08:38 PM
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Originally Posted by techinspector1
Here are 109 dyno-proven small block Chevy combinations. Knock yourself out......
http://www.ryanscarpage.50megs.com/combos1.html
Thanks, I had a look but some of them seem like just a guess. Also They dont say anything about internal mods. I dont mean to be a pain in the neck but yea, I am just really confused

Last edited by handymann3; 10-12-2009 at 08:47 PM.
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Old 10-12-2009, 09:36 PM
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Its not hard to get 400-450hp out of a 350. First thing to do is scrap the 79 heads. If you have a rebuildable 350 core and are on a budget, then stroking it adds unnessary expense.

Last edited by F-BIRD'88; 10-12-2009 at 09:42 PM.
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Old 10-12-2009, 10:45 PM
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Originally Posted by F-BIRD'88
Its not hard to get 400-450hp out of a 350. First thing to do is scrap the 79 heads. If you have a rebuildable 350 core and are on a budget, then stroking it adds unnessary expense.
LOL yea i wasn't planing on making 450hp with smog heads. but yea, got any set ups? p.s Its boing into my 81 T/A
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Old 10-12-2009, 11:06 PM
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Originally Posted by handymann3
LOL yea i wasn't planing on making 450hp with smog heads. but yea, got any set ups? p.s Its boing into my 81 T/A
How do you plan to use the car? drag? street/strip? cross country trip?

$budget$?
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Old 10-12-2009, 11:10 PM
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Originally Posted by F-BIRD'88
How do you plan to use the car? drag? street/strip? cross country trip?

$budget$?
Sorry lol should have mentioned that. I want a steet/strip. As for budget, cheap s possable. I say that because i dont really have a budget yet. I am asking so i know what to look out for and how much i need to put aside for the engine build. Thanks
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Old 10-12-2009, 11:30 PM
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http://www.hotrod.com/techarticles/e...ing/index.html

The engine in this hot rod mag article is typical of what it takes to get 450hp from a street/strip 350.
You can skin the cat a few different ways but the resulting combo won't be much different from this.

The one thing I would do is build this combo with 10.5:1 cr instead of the 11:1 cr in the article, for 92 octane street gas.

Saving money in any real sense will require that you do some or a lot of the dirty work to bring it all together.

A engine like this in a 81 F body will want a 10" high stall (3500rpm) converter and 4.30-4.56 gears for max perf.
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Old 10-12-2009, 11:36 PM
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Another good path to a simple 450hp street-strip 350SBC is to build a supercharged combo around a 144cid B&M/ Weiand mini blower. (low 8.5:1 compression ratio for pump gas)
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Old 10-12-2009, 11:43 PM
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Originally Posted by F-BIRD'88
Another good path to a simple 450hp street-strip 350SBC is to build a supercharged combo around a 144cid B&M/ Weiand mini blower. (low 8.5:1 compression ratio for pump gas)
I took a look at the artical you sent the link for but it said it can with 11.25.1 compression, will the engine like 93 octane?
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Old 10-12-2009, 11:57 PM
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Quote:
Originally Posted by handymann3
I took a look at the artical you sent the link for but it said it can with 11.25.1 compression, will the engine like 93 octane?
Over 11:1 cr on this motor is a bit too much for the premium pump gas we have.

That is why I would build it with a finished true 10.5:1 instead of 11.25:1.

The resulting effect on the real power output is minimual. (less than 2%)

10.5:1 will get the same job done without being so close/over the edge of engine damaging knock threshold on pump gas.

11.25:1 is more than whats nessessary at this power level and needs more fuel octane than pump gas provides.

Building to the different lower cr is just a matter of parts selection/machining build specs. The cost will be the same.

A similar 400hp street/strip 350 flat top piston based engine can be build around a set of home fully ported big valve modified 305 HO heads on a 350. Its cheaper to do but requires that you do all the head porting yourself to save money.

Makes an honest 400hp but not 450hp.

If 400hp is enough:
You can search my old posts for info. I use a similar Isky solid cam and inexpensive stamped steel oem style hp rockers w roller tip instead of full roller arms, in the combo.
As i said there are many good ways to skin this cat.

Last edited by F-BIRD'88; 10-13-2009 at 12:12 AM.
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Old 10-13-2009, 12:10 AM
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Quote:
Originally Posted by F-BIRD'88
Over 11:1 cr on this motor is a bit too much for the premium pump gas we have.

That is why I would build it with a finished true 10.5:1 instead of 11.25:1.

The resulting effect on the real power output is minimual. (less than 2%)

10.5:1 will get the same job done without being so close to the edge of engine damaging knock threshold on pump gas.

11.25:1 is more than whats nessessary at this power level and needs more fuel octane than pump gas provides.

Building to the different lower cr is just a matter of parts selection/machining build specs. The cost will be the same.
Thanks ALOT man, you gave me the exactly what i was looking for. But not to bust your ball$ you mentioned about rear gears. I curently have richmond 3.73's will they be any good? will they kill me at the 1/4?
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Old 10-13-2009, 12:18 AM
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Quote:
Originally Posted by handymann3
Thanks ALOT man, you gave me the exactly what i was looking for. But not to bust your ball$ you mentioned about rear gears. I curently have richmond 3.73's will they be any good? will they kill me at the 1/4?
The 3.73's are not quite enough to get max out of this motor in your car.

It will run well, but not to its max 1/4 mile potential w 3.73's in your 3600# car.

4.56's will run quicker ET's than 3.73's in your car at the drags, with this motor.
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Old 10-13-2009, 12:31 AM
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If you'd rather have a 450hp 350 combo that will work well in your car with 3.73's at the track,
Build a low buck supercharged 350 (low compression) around the 144cid B&M blower. It makes its power at a lower rpm range, requiring less (3.73ish) rear gear ratio.

Over time, the cost of the blower is recovered by not having to swap the gears
to achieve max performance from the combo. The 144-350cid blower combo does not need to be reved as high.
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Old 10-13-2009, 12:37 AM
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Alternatively if you were to run the magazine engine combo (w 10.5:1 cr) along with a 150-180hp nitrous system, the 3.73 gear would be just about right for 1/4 mile ET racing.
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