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Old 07-13-2010, 10:58 AM
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Ok im going with this 383

Hey all, After long debate and everyone's advice I am deciding to go with this setup. I'm budget but I am hoping for around 400 whp. I'm also going to keep My N20 from my previous motor but lower it to a 50 shot due to the lack of forged internals. I putting down the main components to see what you guys think of the parts being used. "Street engine pump gas"

4 bolt main 1985 block 30 over 2 piece rear main seal

383 1-92000BE - Scat Series 9000 11.01 with 64 cc heads

Patriot Performance SB-Chevy 225CC Freedom Series Heads

12-443-8 - Comp Cams 'Xtreme Energy 110
540'' Intake / .562'' Exhaust
2800-6100

3500 stall

Aluminum Roller Rocker 1.5 7/16

electric water pump

JEGS Retrofit Hydraulic Roller Lifters

single plane or performer intake

750 holley hp carb

bluet pro distributor with 6AL box

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Old 07-13-2010, 11:47 AM
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Is this going to be a street motor? If so stay away from a single plane manifold. And Oct heard patriot heads are junk. Also I think for street 225cc intake runners are a bit big.
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Old 07-13-2010, 05:11 PM
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I actually bought a pair for my 383 in the beginning, and was so appalled by the terrible machining, that I fought with them to take them back for a full refund. I went with Trick Flow 23 deg. street heads, and much happier for a tiny bit more money. Not worth the trouble.
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Old 07-13-2010, 06:39 PM
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What was wrong with the heads bad porting valve Job? Thought the price was to good to be true. What is the flow #'s on the Trick flow heads @ 600 lift
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Old 07-13-2010, 06:57 PM
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i read the machining was crap and the heads weren't very consistent. i too at first was excited by such a head for the price. but after all the bad reviews i just told myself id sack up and spend 1500 on a set of AFR 195cc heads. 1500 may be a bit much for you as it is for me too but i want to do it right
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Old 07-13-2010, 07:10 PM
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Being a journeyman toolmaker, I knew at first glance that the valve guide holes were off center to the guide o.d's. I measured, and they were .030" off center. No way the seals would have held. The first response I got was " They come with rubber seals, so they should be able to compensate" No way I was going forward with a response like that....The AFR's are the ultimate, but for $1000 from a reputable retailer...Trick Flows flow 253 cfm. which is pretty darn good. Also a good runner size. My 383 is just plain violent from a dead dig. Awsome throttle response.
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Old 07-13-2010, 07:28 PM
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what size runner did you get on the trick flow's?
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Old 07-13-2010, 07:47 PM
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Street Engine, pump gas? 225 cc intakes? Why? The cam you spec'ed has lift of .562 and you're worried about flow at .600? 200 to 215 cc would be plenty for a street engine, especially if you're going to use spray.

11:1 compression is not so good with pump gas. 10:1 would be better.
I would look over your plan again.
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Old 07-14-2010, 07:39 AM
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Quote:
Originally Posted by lngliv3
Being a journeyman toolmaker, I knew at first glance that the valve guide holes were off center to the guide o.d's. I measured, and they were .030" off center. No way the seals would have held..
I feel you there, I sent my lt1 head of to get 2.02 1.6's and I had one valve guide off and still is. And had a rocker fly off that same one every now and then. ended up having to lash it down more than the others to fix it. thanks for telling me that.
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Old 07-14-2010, 07:46 AM
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Quote:
Originally Posted by cool rockin daddy
11:1 compression is not so good with pump gas. 10:1 would be better.
I would look over your plan again.
Thought I might as well go bigger than my lt1 its around 10:5 and with a 112 lsa. I'm told if you get enough overlap or "bleed" on a street motor you can run 11:1 on 93 just fine.
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Old 07-14-2010, 09:15 AM
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That will not make 400 rwhp on a dyno. The 350/th350 stroked is a nice powerband. Heads, THAT cam, and pump gas compression, with a fitting intake, tip top carb, 3.75 crank, won't cut it. 400RWHP is lots.

There is this weiand supercharger theory of mine.

Ever supercharge a base 350? Wow is right. A weiand roots install will make trying different cam/compression combinations look like fools gold. Then in steps hit the cam+heads together when your bank recovers. Only way you will get to 400RWHP.
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Old 07-14-2010, 11:39 AM
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[QUOTE=spinn]That will not make 400 rwhp on a dyno. The 350/th350 stroked is a nice powerband. Heads, THAT cam, and pump gas compression, with a fitting intake, tip top carb, 3.75 crank, won't cut it. 400RWHP is lots.

I made 320 whp with a non CNC LT1 head just port matched and bigger valves with a good size cam and the carbed lt1 intake NA. I donít see why 400whp is to much to ask for in a 383 na.

Last edited by Tyler007; 07-14-2010 at 11:44 AM.
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Old 07-14-2010, 12:41 PM
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11:1 cr with that cam (294 degrees) and aluminum heads will work fine with 93 octane.

fyi, valve overlap doesn't "bleed" off cylinder pressure. The engine isn't trying to make compression during the overlap part for the cycle.

What lowers cylinder pressure is the intake valve closing point. After the intake valve closes, the engine starts to make cylinder pressure. It is called Dynamic Compression Ratio (dcr) and is calculated from the static compression ratio (scr) and the intake valve closing point. The stroke and rod length are also used in the calculations.


11:1 scr will drop to 8.0 dcr with a 294 degree cam in a 383 sbc, which is ok with 93 octane.

200cc heads would be better for a street engine.

I would use the edelbrock RPM intake and a 3000 stall.

Should also use a 4.11 gear with that cam.
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Old 07-14-2010, 02:38 PM
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383 pump gas compression , Ported 2.02/1.60 Edelbrock RPM E heads, high rise single plane intake, 750 DP, Roller hyd cam 290/290 .6/.6" , 1 3/4 headers. Didn't make 400rwhp.

My 318 bored to 323", Aeroheads 318 LA bean chamber heads 1.88/1.60" valve. 8.8:1 compression, purple shaft cam, single plane intake, holley 600cfm , summit open headers, 4 speed with 4.10 gears cut 14.70's in the quarter.

It is kept on the start stand because it sounds so good.

Last edited by spinn; 07-14-2010 at 02:56 PM.
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Old 07-14-2010, 02:58 PM
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The TFS heads I went with are 195c runners. Here is my combo..estimated at 430 hp. I built this in my basement for $3600, but if you get a 90's roller motor from a bone yard, you could save even more, and have more power. Thats where I would go if doing it again.

TFS 195 23 deg. street heads $1,049.99 @ summit racing
Lunati voodoo 60103LK cam/lifters/matching springs
Eagle balanced rotating assembly w/ speed pro 10.7-1 flat tops
Mallory ignition
Holley 700 dp
Th350 with 3000 stall
4:10 gears
Check it out on youtube "Voodoo 383" its on a stand and running.
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