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Old 06-24-2012, 07:54 PM
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Need advice on a 383 build

Hello, I'am new to hotrodders forum my name is Nick i live in Ocala, Fl.

I'am working with a old 4 bolt 350 block .30 over. My power goals are 450Hp+ and Torque. ( The only parts i have are the crank kit/all gaskets/MSD Ignition kit). This engine will be going in a 87 camaro with a TH400.
I need help picking the right HEAD, CAM, And STALL CONVERTER.

-Eagle Cast steel crank, 3.75 stroke 6.0 rods/ Flat top pistons +5cc 2 valve reliefs. I hope i ordered the right kit, this kit says +5 cc flat top pistons. When i use this compression chart i came up with 10.5:1. Im using .041 HG/ .020 deck to get these numbers.

-Will a 6 3/4 harmonic do?
-Dart 10521122P - Iron eagle platinum heads, 64cc / 215cc Intake / 75cc exh.
-Lunati 01007 - http://www.summitracing.com/parts/LUN-01007/
-Lunati 30116 - http://www.summitracing.com/parts/LUN-30116/
(That is my guess on the cams, I need some help picking the right cam. This car will be used for Street/Strip.)
- 1.6 ratio roller rockers
-Edelbrock 2601 - Edelbrock Performer Air-Gap Intake Manifolds
-750 or 850 Carb?

I want most my power in the low end to mid, Lets say.. 2000-4000 rpm.
Any other advice you guys can give me the better.

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Last edited by Sohcnick; 06-24-2012 at 08:12 PM.
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Old 06-24-2012, 08:11 PM
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You're pushing the limit on compression at 10.5 for pump gas, and if you're looking for 450+ rwhp, you're approaching the forged crank and pistons arena. Not that cast won't cut it, just remember it's not bullet proof.
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Old 06-24-2012, 08:16 PM
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Ok, Since i have the 5cc flat tops all ready should i look for a head with 70+ cc chamber ? I do agree 10.5 is way to high.
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Old 06-24-2012, 08:23 PM
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383

this is a comment only,no advice,extrapolate anything you find helpful.IMO the idle is quite choppy with a hydraulic cam over 300 advertised duration.No doubt that cam would be a torque monster in the mid range.Ive used those heads with very good results also.With a nice clean up,they flowed over 250 cfm at .600 in lift..We used a 4.11 gear with the 3 spd auto and later changed to 4.88 and a glide.Both carbs are good.
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Old 06-24-2012, 08:34 PM
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I agree with vinnie, that's a lot of cam for a street small block. I have a Herbert 292 in my T's BB 427, with dual 600's and tunnel ram it's over the top and barely streetable, I can imagine your cam in a small block wouldn't have great street manners. If you already have those heads, it might be cheaper to buy some dished pistons if you want to drop the c.r.
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Old 06-25-2012, 02:04 AM
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OK did some more research and i found out i can return my cam, These are the new parts..

-Crank/rods/piston kit- http://www.summitracing.com/parts/SCA-1-40755/
3.75 stroke, 6in rods, flat piston 2 valve reliefs 5cc.
-Camshaft- http://www.summitracing.com/parts/LUN-07104LK/
235 int./240 exh. .490 lift
-Intake- Edelbrock Performer Air-Gap Intake Manifolds
-Heads- http://www.summitracing.com/parts/DRT-11621122P/
215cc , 72cc chamber (I chose the 72cc over the 64 for two reasons lower compression and if i decide to add a supercharger in the future.)

I have a couple of questions if anyone feels so kind to help me out.
-I don't know what harmonic balancer to go with.
-Not sure what stall converter to use.

Any other helpful tips would be much appreciated.
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Old 06-25-2012, 03:06 AM
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By the way, I'am not going to drive this car every day. I plan to drive it to the drag strip its about 15 min drive. I have way to many speeding tickets so for my own good i wont be driving this anywhere but the strip.
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Old 06-25-2012, 06:17 AM
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damper

I used a "fluid" damper,thats a brand name.Just make sure its sfi approved.
Back around 1980 I was racing at S.I.R.,between rounds after tossing a belt we noticed the outer ring on the G.M. balancer was separating.Thats the closest Ive been to having a balancer failure so since then Ive always used improved balancers.
re convertor?Thats a tough question, the best race convertor will be a little slippery for street use.What will you tolerate?
What first gear ratio will you be using? What diff ratio will be ideal for your goals.

Now a days,there a lot of cars use mild stalls with 4 speed autos with a moderate gear ratio,example: I would rather use a 4 spd auto with 3.7 gears than a 3 spd with 4.1 gears.The launch will be similar as some 4 spd autos have a deeper 1st gear.

Its sometimes easier to work backwards from the results you want to what it will take to get you there.example, I want to have a daily driver that I can run at the track on week ends that will run 13 flat and still not destroy the pocket book everytime I fill up.Look at a new corvette and see what you can do to your car to make it that quick and how much it will cost.You might need a little more power because of weight or modern technology.copy that outline with what works in your car
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Old 06-25-2012, 01:14 PM
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Sohcnick -- In your Original post you mentioned .020 deck height and a .041 head gasket. This yields a .061 quench. This quench seems a bit high to me. Is it too late to zero deck? Or, you might want to consider a .025-.028 head gasket. Perhaps with flat tops (no dish) this isn't quite as important, but something in the .040-.050 range would still be more desirable. I think you're approaching the outer limit of what works for proper quench.

Best of Luck

PatM
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