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Username Post: 383+Vortec=???hp        (Topic#184350)
89RStroker 
Contributor
Posts: 367
89RStroker
Reg: 01-07-08
03-11-08 01:50 PM - Post#1385474    

Alright fellas, i am wanting opinions as anyone else, i am hoping my rotating assy is fine except trplacing 1 piston and 1 rod.


.030 over 9.7 to 1 compression pistons

scat 3.75 stroke

Ported and polished vortec heads with 1.94 1.50s.

RPM air gap intake

750 holley

HEI dist



I am thinking 450ish HP and close to 500 ftlbs, the cam i am re using is the comp XR288 with 236/242 A.050, 520/540 lift(555 intake with 1.6 swap) on a 110 LSA...


Any suggestions on power output? I htink it will run great but i have seen a similar buils with a smaller cam make 458 HP and 50X TQ, i assume a bit more power with a slight TQ loss?
6.0 LQ4, 242/248 @.050, .610/.615 lift, 110 LSA, Holley 750 Carb, Victor Jr intake, Stainless works headers, T56 6 speed trans, Moser 12 bolt 4.30 gears, manual steering and no AC.

Best to date, 7.1@97 MPH, 1.5 60 foot, stock junkyard 6.0 carb/cam


 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 16194
grumpyvette
Age: 66
Loc: FLORIDA USA
Reg: 03-16-01
03-11-08 04:45 PM - Post#1385585    
    In response to 89RStroker

thoughts?

stock vortec heads are limited to about .470 lift with out a good deal of machine work and new springs due to clearance issues

stock small port vortec heads are fairly restrictive on a 383 once you start winding it up into the rpm range that cams designed for

chevy has just announced NEW LARGE PORT 206CC versions of the vortec heads which are designed for increased flow and are similar to the FASTBURN heads but the new vortec 206cc heads are CAST IRON
PART # 25534371
" " IF YOU CAN'T SMOKE THE TIRES FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK !"


 
CNC BLOCKS N/E 
Senior Member
Posts: 831
CNC BLOCKS N/E
Loc: NORTH EAST
Reg: 12-12-03
03-11-08 07:02 PM - Post#1385752    
    In response to grumpyvette

  • grumpyvette Said:
thoughts?

stock vortec heads are limited to about .470 lift with out a good deal of machine work and new springs due to clearance issues

stock small port vortec heads are fairly restrictive on a 383 once you start winding it up into the rpm range that cams designed for

chevy has just announced NEW LARGE PORT 206CC versions of the vortec heads which are designed for increased flow and are similar to the FASTBURN heads but the new vortec 206cc heads are CAST IRON
PART # 25534371



Grummpy

GM never made a Vortec Bowtie head that had 206 runners as that was a misprint in the catalog and the paper work that came in the head boxes as the runners were closer to 215 CC, That head has been dicontinued as there is a new P/N and the new Vortec heads have a 225CC intake runner and you have to use a offset rocker on the intake side as they have changed the intake ports of those heads.


 
89RStroker 
Contributor
Posts: 367
89RStroker
Reg: 01-07-08
03-11-08 08:06 PM - Post#1385812    
    In response to CNC BLOCKS N/E

I already have the heads, they will be machined of course, i am just wondering what the output might be, if i will exchange the TQ for HP as i figgure, i have done a decent amount of porting and polishing but they still only yield 275ish CFM with a good port job.
6.0 LQ4, 242/248 @.050, .610/.615 lift, 110 LSA, Holley 750 Carb, Victor Jr intake, Stainless works headers, T56 6 speed trans, Moser 12 bolt 4.30 gears, manual steering and no AC.

Best to date, 7.1@97 MPH, 1.5 60 foot, stock junkyard 6.0 carb/cam


 
CNC BLOCKS N/E 
Senior Member
Posts: 831
CNC BLOCKS N/E
Loc: NORTH EAST
Reg: 12-12-03
03-11-08 09:11 PM - Post#1385874    
    In response to 89RStroker

The 383/s we have built with a hyd. flat tappet cams and 906 casting have been around 500 ft. pounds of toure and 449 on the HP

Here is a link to an engine we built years ago with AFR/s and using a well prepared set of vortecs the numbers were pretty much the same on the dyno.
http://www.chevelles.com/forums/showthread.php?t=1...


 
MikeB 
Senior Member
Posts: 9479
MikeB
Loc: Plano, TX
Reg: 08-28-03
03-12-08 11:20 AM - Post#1386274    
    In response to CNC BLOCKS N/E

  • CNC BLOCKS N/E Said:
The 383/s we have built with a hyd. flat tappet cams and 906 casting have been around 500 ft. pounds of torque and 449 on the HP.


Wow! So much for needing larger intake port volumes to make HP on a 383. I would have guessed 400 HP was the max those little heads could make. Guess it goes to show you velocity is as (or more) important than volume.
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



 
Brain55 
Frequent Contributor
Posts: 1153
Brain55
Age: 48
Loc: Brentwood, CA
Reg: 07-23-02
03-12-08 12:42 PM - Post#1386325    
    In response to MikeB

  • Quote:
Wow! So much for needing larger intake port volumes to make HP on a 383. I would have guessed 400 HP was the max those little heads could make. Guess it goes to show you velocity is as (or more) important than volume.



I have a 355 that makes 425 HP @ 5500 RPM and 440 ft. lbs. @ 4500 RPM with vortecs. So I can believe 450 HP and 500 ft. lbs. with a 383.

Brian
'55 210 2-door sedan
355 SBC, vortec heads (364HP, 377ft/lbs @ wheels), M-20, 3.70 gears
Crew chief of the Pyromaniac jet dragster
www.allmobilerepair.com


 
89RStroker 
Contributor
Posts: 367
89RStroker
Reg: 01-07-08
03-12-08 07:33 PM - Post#1386616    
    In response to Brain55

Alright then fellas, that should hold me over till the 408 is done:)
6.0 LQ4, 242/248 @.050, .610/.615 lift, 110 LSA, Holley 750 Carb, Victor Jr intake, Stainless works headers, T56 6 speed trans, Moser 12 bolt 4.30 gears, manual steering and no AC.

Best to date, 7.1@97 MPH, 1.5 60 foot, stock junkyard 6.0 carb/cam


 
CNC BLOCKS N/E 
Senior Member
Posts: 831
CNC BLOCKS N/E
Loc: NORTH EAST
Reg: 12-12-03
03-12-08 07:59 PM - Post#1386641    
    In response to Brain55

  • Brain55 Said:
  • Quote:
Wow! So much for needing larger intake port volumes to make HP on a 383. I would have guessed 400 HP was the max those little heads could make. Guess it goes to show you velocity is as (or more) important than volume.



I have a 355 that makes 425 HP @ 5500 RPM and 440 ft. lbs. @ 4500 RPM with vortecs. So I can believe 450 HP and 500 ft. lbs. with a 383.

Brian



Brian we built a 355 with Vortec heads a few years ago with feather lite stuff and 6 inch rods and the same cam we used in our 383's and we got 432 and 460 on the torque and this engine is in older Grand Prix and its a Kick a-ss peice.


 
89RStroker 
Contributor
Posts: 367
89RStroker
Reg: 01-07-08
03-13-08 01:51 AM - Post#1386749    
    In response to CNC BLOCKS N/E

What are the cam specs?
6.0 LQ4, 242/248 @.050, .610/.615 lift, 110 LSA, Holley 750 Carb, Victor Jr intake, Stainless works headers, T56 6 speed trans, Moser 12 bolt 4.30 gears, manual steering and no AC.

Best to date, 7.1@97 MPH, 1.5 60 foot, stock junkyard 6.0 carb/cam


 
Thadd 
"12th Year" Gold Supporting Member
Posts: 11139
Thadd
Age: 75
Loc: Rolling Hills, Ca,
Reg: 12-30-01
03-13-08 04:03 PM - Post#1387256    
    In response to 89RStroker

FWIW, my 383 with vortecs, a hydraulic roller that was 270/276 duration and .490/.502 lift pulled 438 Horses at 5500RPM, and 482 ft/lbs at 4000 RPM.
I was running a dual plane manifold and a 750 Edelbrock carb, and Sanderson headers with stock type mufflers.
The dyno operator said that his unit routinely read lower than most (don't they all say that?), and estimated about 15 horses and 20 ft/lbs more on a "racier" dyno. We didn't have time to tweak it much. The carb was out of the box, and the timing was 32 degrees max all in at 2500RPM.
I guess to get the big numbers, you have to wear one of those magazine T-shirts

With a 700R4 and a 4.11 rear in a 3200 pound S-10, it ran low 12's on street tires, and had a ton of torque in normal driving.
Proud member of the BABY BLUE T-SHIRT BROTHERHOOD


 
MikeB 
Senior Member
Posts: 9479
MikeB
Loc: Plano, TX
Reg: 08-28-03
03-14-08 01:13 PM - Post#1387918    
    In response to Thadd

  • Thadd Said:
FWIW, my 383 with vortecs, a hydraulic roller that was 270/276 duration and .490/.502 lift pulled 438 Horses at 5500RPM, and 482 ft/lbs at 4000 RPM.



If that's a Comp XR cam, I had it in a 383 with Dart Iron Eagle 180s, a Performer RPM, and a 650 Holley. Had no idea my engine might have made that much power. I always assumed 375-400 HP and 425-450 TQ.
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



 
Brain55 
Frequent Contributor
Posts: 1153
Brain55
Age: 48
Loc: Brentwood, CA
Reg: 07-23-02
03-15-08 10:41 AM - Post#1388634    
    In response to 89RStroker

  • 89RStroker Said:
What are the cam specs?



I'm running a Comp Cams XR276HR with 276/282, 224/230 @ .050", and .535/.544" lift with 1.6 rockers installed with a 106 ICL.

Brian

 
CNC BLOCKS N/E 
Senior Member
Posts: 831
CNC BLOCKS N/E
Loc: NORTH EAST
Reg: 12-12-03
03-15-08 12:53 PM - Post#1388700    
    In response to 89RStroker

  • 89RStroker Said:
What are the cam specs?



Its a cam we have used in our circle track engines for years and we have it custom cut for our engines its a HYD. flat tappet 284 ADV. 232@.050 and the duration at .200 is 143 I believe and its a single pattern cam that why the high torque numbers.


 
DeltaT 
Frequent Contributor
Posts: 1023
DeltaT
Loc: San Jose area, CA, USA
Reg: 06-20-02
03-15-08 06:23 PM - Post#1388903    
    In response to CNC BLOCKS N/E

If you ever upgrade the Edelbrock E-Tec 200's are great heads that could take you up well into the 500's with just a head swap. They are Vortec-style heads and will work with your manifold. I think you'll hit your 450/500 goal with your ported Vortecs.

Should be a blast to drive...

Jim

 
89RStroker 
Contributor
Posts: 367
89RStroker
Reg: 01-07-08
03-17-08 05:36 PM - Post#1390406    
    In response to DeltaT

Thanks a ton guys, i think it might be a bit much cam but ill get over it, i am going to invest on forged rods and hit it with a 100 shot of dope.
6.0 LQ4, 242/248 @.050, .610/.615 lift, 110 LSA, Holley 750 Carb, Victor Jr intake, Stainless works headers, T56 6 speed trans, Moser 12 bolt 4.30 gears, manual steering and no AC.

Best to date, 7.1@97 MPH, 1.5 60 foot, stock junkyard 6.0 carb/cam


 
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