all4u

A guy from my work was able to out run me on the street, had him out of the hole in my 89 formy 350 but the engine is tired and needs a replacement. I want to build another 383 because of the awesome torque it provides on the street. I need to know what everyone thinks I will run with my combo.

4 bolt 30 over roller block, Eagle forged rods and crank, Mahle forged pistons with Mahle plasma rings, comp cams 1.6 roller rockers with my new cam: Int 236/Exh 242 lift .555/.576 lobe 112, AFR 210 cc heads, 65 cc, 210/160 valves.

I want to top it all off with a FIRST intake because I like the TPI look. I know I'd make more power with the sealth ram but I don't care.

I was also contemplating if I should throw my 9lbs procharger kit on it or will it not take the boost? Also I have a used but in good condition nitrous kit, NOS 05151 with the throttle plate but it might not fit behind the new throttle body with the First intake.

Thoughts on my combo and if I should charge it, juice it, or both. Also remember that this would be a weekend street machine. It goes from Elk Grove Village to Strats in Villa Park and back, that's it.

mw66nova

iTrader: (13)

sounds like it'd be a nice runner, what's the rest of the combo? static compression ratio?

all4u

rest of combo is basically t56 trans, moser 12 bolt, and a crap load of weight reduction on my formy.

Compression is right at 9.8 but I'm thinking of changing that.

I want this to run on pump gas so no bashing on how it isn't radical enough. I know, I know, but it can't be a trailer queen!

mw66nova

iTrader: (13)

i think that camshaft is going to like 10.5:1 and should still be able to run on pump gas.

i feel ya on the street car thing man, mine is still a street car too.

all4u

I could go up to 10.3 but maybe I could get a thinner head gasket and closer to 10.4. I think I should be able to spank the living daylights out of that STI. I wish I could go turbo LS2, then I'd run circles around him.

cp87GTA

First thing, check the eagle crank snout very carefully. All the ones I have seen are about.002 too small, and if you are going external balance will cause a problem. All sbc balancers should be a pressed fit. My machinist won't use an eagle crank for sbc because of it. I know there are a lot out there in service, but there are also a lot of failures that no one heres about. I called eagle about the problem when I had a failure and they told me my cranks were at spec. I then sold the one I had for a 383 and bought a scat crank and it internally balanced with 5.7 rods. 383 and tpi? How are you going to hold it on the street? Even with a HSR it'll have plenty of bottom end.

all4u

Thanks for the info. My buddy was going to sell me a callie's crank but I already had the eagle. I'll see what happens. I have never had a problem with eagle products before, but we shall see.

As far as keeping it on the road, I don't see a problem. I think I should throw on the procharger and see what happens then. I think the torque then will be too much no matter what the tire I put on, and no I'm not going to mini tub it! NO MORE PM's ABOUT MINI TUBBING!

shelby7099

From what I understand, if you run boost you want lower compression. Since you are rebuilding the motor you could build it for the Procharger. With an all forged lower assembly you can run more boost, and use copper headgaskets. The lower the compression you run the more boost you can run too. Too high of compression and you will blow a head gasket.

all4u

thankyou for that, I knew that, but thanks!

I haven't completely decided on my setup because I want it driveable but also fast. MPG is no worry and I don't care about AC or anything like that.

If I procharge, I will probably swap the heads, drop compression to 9:1, and boost the hell out of it. What I lack in cubes, I'll make up for in boost.

I want to keep running aluminum heads, price doesn't matter, haven't done much research other than AFR heads. They are a good price, and they are aluminum. Aluminum will allow a slightly higher compression.

AC

iTrader: (3)

As long as your motor is less than 10:1 CR then throw that procharger on it if it also has the intercooler. Procharger kits are made for our stock L98's at 9.8:1. I just finished my 383 and its a 9.8:1, forged (eagle rotating asseembly). I've run my eagle assembly in 3 different 383's. The first was a 8.7:1, then a 9.5 now will be the 9.8:1. ALWAYS had a Procharger P1SC pushing 5-7psi. This season will bring a D1SC and a 3 core intercooler.
I think the new setup is great, throw the blower on it and post up how you left the STi behind.

all4u

What kind of numbers do you have at 9.8:1 with 7 lbs? I was going to do 12 lbs on 9.1 compression. I kind of wanted an idea of what that should be pulling, ball park figure.

AC

iTrader: (3)

My combo has been ALL over the map for the last 2 years. My best (one I'm not proud of) is a tune I did myself that was almost 12 degrees retarded on the spark map and only 13.8 AFR (should have been near 12.3) With a VERY bad tune and only 5psi on my 383 I was at 327hp and 483ft-lbs. I know, doesn't sound impressive for a blown 383 but like I said, it was a very bad tune. All that was on a 9.5:1 motor.

all4u

Wow, I don't want to sound mean, but I should be close to that if not more on engine alone. I'm sorry, but if I make those numbers when I'm done, I will sell it and by a civic!

AC

iTrader: (3)

LOL, its not mean. I made a huge error and never noticed the performance lack because the torque was instant and I only drove the car for 1100 miles last year. Hence the reason I tore apart an 1100 mile engine, ditched the block and started fresh. This year will be an utterly new experience. You can buy your civic, it'd never come close to a 383 sbc. The only thing you'd outperforme is the gas mileage.