looking for SBC advise

[31bravo]

Hey guys well i'm trying to figure out what all i should be looking for. I've got a block and Aluminum GM fast burn heads that i want to use. 3.5 stroke and 6 inch rods intake i was thinking a super victor intake. My dad thinks a 850 hp holley carb is good. I'll be honest I'm kinda lost with this stuff I can shoot the wings off a fly at 500 meters but this engine stuff makes my head hurt. please give any suggestions. below is what i already have that will be reused

68 camaro
355 sbc
GM fast burn heads
Dana 60
4.11
th400
3800 stall converter

i think the rear tires are 28x15 but i couldn't be sure, I want this motor to be 10.5:1 it will be a nitrous motor. thanks guys i'm trying to read as much as i can around here to learn. I almost forgot rear has ladderbars.

[stroker1]

Why do you want it to be 10.5:1? Is it a street driven car?

[31bravo]

I want it to be something my father and i can drive on the street on weekends to car shows. I'm not looking for super quick maybe 10.5 with spray. If i need to go 383 let me know i haven't bought a crank and rods yet and as they say "no replacement for displacement"

[stroker1]

I think you answered your own question! Get the cubes and make it easier to get what you're looking for. Might want to consider a flat top 383 and MLS head gaskets. A Victor Jr manifold or the bowtie single plane if it's a vortec style bolt pattern on the head, forged pistons, at least 1 3/4" long tube headers-1 7/8" would be better, nice roller cam, and a NX plate kit or cold fusion or some other good nitrous system.

[31bravo]

What is the benefit of the Victor Jr over the super victor? I've heard there is problems with a 383 on nitrous is that true? I was looking at a Zex perimeter plate system. are the 6inch rods ok or should i stick with 5.7?

[Hitchcock]

There are really no problems with the super vic. But on a 383 with 10.5 comp. There are better intake choices, like the vic. junior. The smaller runners on the Jr. will keep velocity up and help build ground pounding torque. Bob west's car is a fine example of how touque moves a car. And the zex plate is bad ass. 383's and nitrous, no problem. Just make sure your builder knows what your intentions are so he can set it up for spray. There may be quite a few controls like timing computer, progressive controller for the nos and other things you should look into. If it is a fairly mild 383 it may take as much as a 200 shot to get 10.50. But your goals are very practicle. Just build for durability.

[31bravo]

Okay guys thanks so far, what about rod length? gasket thickness? what am i looking at combustion chamber wise on a .030 over block, flat top piston, 383? (I'm trying to figure out if i have to mill my heads or get a thicker gasket to reach my desired compression ratio)

[mytmouz]

It will depend on the cc of the heads as to what the compression ratio will be. If you already have the rods, use them. If not, I would go with a 5.7 rod so you would have a little more meat around the rings since you are gonna spray. I sold a 68 Z/28 to a friend that he put a pump gas 383 in. It is an all stock car with the original 12 bolt. It has a 4 speed in it, went a 7:02 in the 1/8th on motor the last past before the stock axles broke...

[stroker1]

I have an internally balanced 383 in my S10 with 6" Scat rods with 7/16" 12 point
ARP bolts and rods have hollow alignment dowels for proper cap alignment. Howards Racing Components pistons which are forged domes made by Ross Pistons. Childs & Albert rings file fitted for nitrous, Federal Mogul Competition Series bearings, Edelbrock Performer RPM heads, Competition Products Hurricane Intake (heavily ported), Herbert Roller cam, 7/16 rocker studs, 1.6 rockers, and 2" tube Hussler Headers with 3 1//2" turn outs. And a 180 shot on it. Truck weighs around 2950 with me in it. Goes high 6.20s to low 6.30s in the 1/8th. PG with 4.56 gears.....too much gears for the 1/4 but should go 9.90s in the 1/4 mile. Maybe this will give you some idea of what to expect. A 10.50 car on the bottle should be pretty easy.

I would not be scared of a 6" rod in a 383. The longer stroke engines like a 434 get some really thin ring lands. But with a 3.75" stroke you should be fine with nitrous. I would use a Felpro MLS head gasket or a Cometic MLS. If you leave a .015" deck height, a .041" head gasket, a 64 cc chamber head, and these flat top forged pistons from SRP by JE you will have roughly a 10.7:1 static compression ratio.

http://www.dougherbert.com/pistonkitinc ... 14554.html

[jmarkaudio]

You definitely want a 383, the difference is worth it. Stick with a 5.7 rod, with what you have it will make .05 to .10 difference in ET despite what anyone tells you. My dad, brother and I have built a LOT of 400 combos since the late 70's and have seen the difference. Victor Jr. will work fine, Super Victor is a little big for a street motor and will kill bottom end. With a 3800 stall, limit your duration to about 250@.050 on intake, 260 on exhaust and a 110-112 LSA if you plan to spray it, roller cam would be a plus. A 750 DP will be more suitable and make it more responsive. Set your distributor between 20-25 degrees initial and limit total between 32-35 to start with the fast burn heads and make the distributor springs light to come in as fast as possible.

[supernova]

This motor I ran for a few yrs, was a 383, 6" rod, 10.82-1compression, 195 cc runner trick flow head, 1 3/4 tub header, team g intake, solid comp cam, 200 hp nos system, turbo 350,
3400 stall, 4.10 gear, 10.5 slick.

Ran 6.30s (1/8 mile) 7.40s no nitrous all day long on 93 pump gas. Drove it to work everyday for 2 yrs.

I don't think you will have a problem if you stay under 11-1 compression with fast burn heads.

A 383 is a great motor.

[dadnova]

Ah the best of both worlds, run low boost on the street, and turn it way up for the track.

[1quickchevy2]

WOW what size it that looks over 100mm!!! With no intercooler do you run it on alky??

[vegaracer]

I agree with 1quickchevy2. We need more pictures/info

[dadnova]

It's a 98mm system and I havent completed this set up yet. only a few pieces left to go, as we have been working on my freinds car.
The last time this system was ran was on a 406cu at 8.5 to 1 comp. making 1000+ hp @ only 14lbs of boost, as the car would hold no more hp.
Now it's on a 427cu. at 11 to 1 comp. to be ran on E85 and E98, however with what I think I am going to get out of this combo I had to do the car over. So it was gutted, and re-subframed, tubbed, a 7.5 certified funny car cage was added, parachute mount, and so on.
With times being as they are it's taken longer then exspected but just a couple more items and second safety check of everything and I should be good to go.