Thread: the right exaust for 383

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I have a 383 stroker putting out about 550 H/P and just wanted to know about the right sized exaust i should use. currently I have 3.5 in. exaust with flowmasters. is this reasonable or what?

Originally Posted by #1firebird

I have a 383 stroker putting out about 550 H/P and just wanted to know about the right sized exaust i should use. currently I have 3.5 in. exaust with flowmasters. is this reasonable or what?

i was going to say 3 inch with a x-pipe but what you have might be good 4 it 2

What size are your headers? 3 1/2" exhaust seems a little too big. I would assume your header collector size should be 3", and that's the size exhaust you should run. Unless that is a picture of your motor on your Avatar? Is it a blown engine? Then it might be okay.

WE KNOW HOW A GOOD SET OF HEADERS [large steped tube headers]MAKE REAL GOOD POWER W/AN OPEN EXHAUST RIGHT? OK THEN THERES YOUR ANSWER. LARGE TUBE HEADERS 1.750"-1.875" -2.00"(stepped preferebly)to 3"STEPPED TO 3.500 INTO THE FLOWMASTERS THEN SPLIT 2-3.00"-3.500" OUT OF THE FLOWMASTER! NOW YOU HAVE ONE BIG STEPPED TUBE EXHAUST AND THAT WILL SUPPORT UP TO 427CI OR A BLOWN SOMTHING OR OTHER AND YOU DONT HAVE TO BUY A NEW EXHAUST FOR YOU NEXT BEAST. AND IT SOUNDS SCARRY AS HELL.AND YOUR FARFEGNUGGEN IS @10+

nah gimmie about another year and itll be supercharged,got the blower though. headers are 1.5 i believe but its duel out the back.

Those Are To Small For Some Serious Power,but They Will Work,
You Mill Cant Breath,the Primary Tubes Probably Blocks The Exh. Port. Especially If They Are Ported To Any Extent. Check It Out

my what cant breath? and yeah its definnatly ported i looked and measured my headers today and there 2 in.

my what cant breath?

Mill = engine . . .

Originally Posted by Henry Rifle

Mill = engine . . .

[QUOTE=#1firebird]my what cant breath?


All of a sudden I feel like a Dinosaur.


Don

[QUOTE=Itoldyouso]

Originally Posted by #1firebird

my what cant breath?


All of a sudden I feel like a Dinosaur.


Don

Haha my bad

Originally Posted by Henry Rifle

Mill = engine . . .

I do believe what we have here is a generation (or two) gap!!!! I knew exactly what ya meant, Jack!!!!!

Compliments of Larry Meaux's (Max Race Software) PipeMax program

--- Single Primary Pipe Specs --- for CID for 382.668 m 4300 to 6800 RPM
Diameter= 1.721 Length= 31.3 to 34.1 also 21.9 to 24.6 inches long
Note> Maximum Primary's Tuned Length= 52.3 to 55.0 inches long

--- Header Collector Specs (Conventional Straight Tube) ---
Diameter= 3.161 Tuned Lengths= 17.9 best and also 9.0 or 35.8

H-Pipe= 17.9 X-Pipe= 71.7 distance behind end of Primary Tube ends

-- Total Exhaust System Tuned Lengths (Primary ends to TailPipe end) --
Best HP/TQ Tuned Collector Lengths= 17.9 , 35.8 , 71.7 , 143.4 inches long

Worst HP/TQ Loss Collector Lengths= 26.9 , 53.8 , 107.5 , 215.1 inches long

Note=> measured from where the Primary Pipes end inside the Collector to
the point the tailpipe exits into the atmosphere.
H-Pipe is located at end of Collector, and X-Pipe is located
usually half-way between end of Primary Pipes -to- tailpipe end

Note-> all Pipe Diameters are OD and based-off .0625 inch Pipe thickness

---- Primary Pipe's Harmonics ----
1st Harmonic = 137.7 inches long ... typically never used
2nd Harmonic = 52.3 inches long ... longest recommended
3rd Harmonic = 31.3 inches long ... highly recommended , best Torque Curve
4th Harmonic = 21.9 inches long ... shortest recommended
5th Harmonic = 16.5 inches long ... typically never used
6th Harmonic = 13.0 inches long ... typically never used
7th Harmonic = 10.6 inches long ... typically never used
8th Harmonic = 8.8 inches long ... typically never used

---- Collector's Harmonics (includes Intermediate, Muffler , TailPipe) ----
1st Harmonic = 143.4 inches long ... longest with Mufflers and TailPipes
2nd Harmonic = 71.7 inches long ... longest recommended with Mufflers
3rd Harmonic = 35.8 inches long ... more bottom-end Torque
4th Harmonic = 17.9 inches long ... highly recommended , best Torque Curve
5th Harmonic = 9.0 inches long ... reduced Torque , more top-end HP sometimes
6th Harmonic = 4.5 inches long ... reduced Torque , not recommended

danm.............................