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Old 01-03-2008, 09:32 PM
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my motor so far...

ok I have built this 383 sbc with alot of penny pinching and advice from other people (not on the outernet) and an honest review of my parts and future options would be great from you guys.

here is my parts list_

010 block (1976) that has been fully gone over by C and D machine in totem lake, Wa. bored 40 over and all that.

It has an Eagle street strip rotating assembly with a cast steel crank, I beams, and keith Black hyper pistons with -7 cc flat tops, clevite 77 bearings.

The cam is a comp magnum 286 flat hydraulic with 110* lsa 236 degrees duration at 50, 490 lift. Ive learned that with cams, erring on the smaller side of two choices is best. its installed at 106 intake center line as per reccomendations.

heads are dart pro 1 aluminum 200 cc runners, 64 cc chambers making 10.9 to 1 compression. Too much? I used the springs, valves, retainers and guideplates that came with them.

I put on harland sharp rockin rollers with 1.5 ratio.

plus a vic jr maifold.

plus hedmann 1 3/4 primary headers.

any thoughts on hp/tq? i built this motor to rev decently and theres a bias towards upper end hp, but nothing too crazy.

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Old 01-04-2008, 07:27 AM
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383 engine.........

hi,sounds to me,like youve built a good engine..let us know how it runs after installation. What kind of car is it going in?
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Old 01-04-2008, 07:45 AM
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I calculate 9.9:1 cr with your combo. A 280H might work a little better (230/230)

I would use a regular, non-airgap, Edelbrock RPM intake and 1-5/8 headers for more low/mid rpm power. And a 750 holley carb (3310)

You will need a 3.73 to 4.11 gear and a 2800 stall.

425hp at 6000 rpms /400 ftlbs at 4500 rpms is my guess.

Last edited by 454C10; 01-04-2008 at 07:51 AM.
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Old 01-05-2008, 04:30 AM
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If you get on ebay and search 8058141688, that is my rotating assembly, 454c10. they have the "handy" cr table and it says with a 64 cc head the comp will be 10.9:1. was I mislead? cause ive always thought one of the cooler things about my build was the compression.
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Old 01-06-2008, 10:02 AM
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Quote:
Originally Posted by cameano
If you get on ebay and search 8058141688, that is my rotating assembly, 454c10. they have the "handy" cr table and it says with a 64 cc head the comp will be 10.9:1. was I mislead? cause ive always thought one of the cooler things about my build was the compression.

You are right. I figured the cr using a 350 not 383. However, those cr tables are a little high because they assume a "0" deck height. However, in most cases the piston is below the deck around 0.015" which knocks off about 0.4:1 cr. so plan on 10.5:1. Sorry about that.

Your cr is...
(785 + 7 + 8.5 + 3 + 64) / (7 + 8.5 + 3 + 64) = 867.5/82.5 = 10.51

785cc=cylinder
7cc=piston
8.5cc=gasket (0.039" thick)
3cc = piston below deck 0.015"
64cc= head volume.

The 286 is a good choice and so would the 292H (my personal favorite for a street/strip car). You will need a 3000 stall and a 4.11 gear. What are your transmission and gear ratio plans?

fyi, dart makes a 70cc in the same head if you want to drop a little more cr.
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Old 01-06-2008, 02:38 PM
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Quote:
Originally Posted by 454C10
You will need a 3000 stall and a 4.11 gear. What are your transmission and gear ratio plans?
After my other thread a few weeks ago I decided against the powerglide in favorof a turbo 400. which has the overdriven 3rd gear right? I'll get new yokes and u joints, have my driveshaft balanced and out to a 12 bolt with 4.10s and the detroit locker my friend sold me brand new. this is going in a 68 el camino.

I was wandering around summit and saw the NOS sniper kit for up to 150 hp. the price and ease of use seemed tempting, but im hesitant because A) it'll be flowing onto hyperuetectic pistons, and B) this is my first hotrod build, i would like to know the ins and out of my fuel system and ignition as-is before getting into nitrous. Im trying to keep it humble, and keep my parts in step with my level of knowledge. (partly because i dont want to be "that guy", also sos i dont blow my motor up)

If i wanted to break 500 hp next time i have a chunk of change, would I get there by having the heads ported and going to a full roller valvetrain?

Last edited by cameano; 01-06-2008 at 02:45 PM.
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Old 01-06-2008, 08:47 PM
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Sounds like a fun build those heads will be your best investment. And id keep your cam somewhere around 240ish ... @.050 run a good single plane like a victor jr or a hurricane from proffesional products great peice by the way! and at least a 750 , not sure how you plan to use it but should run pretty id stay away from the Nitrous with a cast cranka nd pistons like you said. probably will not need them id be more concerned on the suspension and getting a good gear in it and hooking it up also the 400 turbo is not!! an overdrive its just a 3 speed and personally they are great peices but i think you would benefit from a 350 turbo just aswell takes less power to turn them and with little mods can take a huge beating from anthing you throw at it! good luck.
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Old 01-07-2008, 07:00 AM
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You can run a moderate amount of n02 with hypers without a problem. 100 to 150hp will not give you any problems. I ran a 175 to 275 shot with my hypers. As long as you retard the timing and have a reliable fuel enrichment system then you should be ok.

A N02 plate will rise the carb up 1 inch which can make hood clearance issues.

If you plan to drive on the street then get an Edlebrock RPM intake (non-air gap and use the exhaust heating).

I tried the RPM and the Victor jr intake on my car (2600 lbs, 3.90 gear, 5spd, 11:1 cr, 292H cam, 362 sbc) and the RPM had noticeable more torque under 4000 rpm and I could not tell the difference from 4000 to 7000 rpm.
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Old 01-07-2008, 03:23 PM
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thanks guys... Had about two hours sleep and was thinking of the 700r4 with the overdrive, my bad. probably be a t350 then.

and i hear you about the nitrous but i still dont want the extra money and time when im just trying to get my first motor running! only vehicles ive ever owned are a collection of 4 cylinder toyota trucks, so 425 hp should be a blast as far as im concerned.
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