hi im looking for the best full length header dual 3" exhaust system with a stock 5 speed set up.
im 15 years old and i have a 383 stroker and i am wondering what hp and tq my engine will make.
Here are the specs.
1. 1991 chevy 350 vortec block bored .040 over.
2. Scat 383(5.7 rods)fully balanced rotating assembly(we went through and had it rebalanced to make very sure it could withstand the recomended 7500 rpm limit.
3. Heads are double hump heads with stainless 1.94 1.50 valves with .550 lift springs, 7/16 screw in studs w/guides, comp promagnum 7/16 1.6 full roller steel rockerarms, 10.75:1 compression.
4. Cam is COMP Cams xtreme Energy Hydraulic Roller tappet, lift is .495 intake
and .503 exhaust(.525, .537 with 1.6 rockers). Duration @050 is 218 int./224 exh and advertised is 269 int./276 exh.
5. lifters are COMP Cams Pro Magnum hydraulic roller lifters.
6. Intake is Edelbrock Performer(port matched to heads).
7. Carb is a 1969 327 600cfm Q-jet.
8. Misc. cloyes double roller timing chain, clevite 77 bearings, SFI approved fluid damper, MSD ignition, And all painted pontiac blue with high temp clearcoat.
Heres the pics http://myspace.com/1980camaro

 

there is no such thing as a dual exhaust for these cars, you cant buy one. If you want a dual exhaust, it will have to be custom made, and ground clearance is an issue. headers available, headman, hooker, dougs, ect

 

Holy ****, your only 15 and have already built a motor? And a 383 at that! Isnt a 4.75 rotating assembly like $2,000? I couldnt imagine trying to do heads or even an intake manifold and I am 19! Good job!

On another note, I dont know what the laws are where you are from, but if you are doing longtubes, the most popular way is to run a 2.5" pipe off each reducer, tucked up in the tunnel kinda on either side of the motor and tranny, then your mufflers, then turndowns to dump before the axle.

 

well i got the motor on ebay for $1500.
There are no laws were i live other than noise but i don't worry about that i want it LOUD!!!!!!!!

 

I would use dual 2.5" instead of dual 3". You won't be making enough power (I'm guessing 400ish) to need dual 3". My dad just built a stroker 383 with a scat crankshaft, vortec heads, comp cams camshaft (230/236 @.050), 10:1 compression and the 2.5" duals are plenty big. We dynoed my dad's engine with a smaller cam (a little bit more duration that the one you are running) and it made 384hp at 5200 rpm. I have a feeling your engine will peak out at about the same rpm. A camshaft with more duration would make more top end power if you want to sacrifice a little low end torque. I would also recommend going with a holley or edelbrock carb instead of the Q-jet, with at least 650 cfm. Also, vortec heads didn't come out until 1996, so if the block is from 1991, it's not a vortec block, although it should have the provisions for the roller lifters. Good luck with the engine and make sure you know how to properly break it in (if it hasn't already been run in).