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Old 05-23-2012, 03:12 PM   #1
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Car: 1986 Z-28
Engine: Twin Turbo Dry sump 400ci SBC
Transmission: Trans Specialties Reid case Glide
Axle/Gears: 3.25 Moser 9"

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My Vortec headed 383 - Dyno Results!

I recently built a Vortec headed 383 for my 86 IROC, last saturday we finally got around to putting it on the dyno. The Specs are as follows:

"880" roller block, Scat crank, Compstar rods, wiseco forged pistons, 10.2:1 CR, custom hyd roller cam (.563"/.544", 224/229 duration @ 0.050", 110 LSA, installed on a 108 intake centerline) 906 vortec heads, CHE bronze valve guides installed to solve the retainer to seal clearance issue, valve sizes were opened up to 2.02"/1.60", Bowls were blended to accomodate the new larger valves, spring pockets were cut to fit a beehive valve spring, machined them for screw in studs and guideplates. No other porting was done to the intake ports, the exhaust we raised the roof of the port 0.075" and opened up around the guide. The intake was a edelbrock performer RPM, with AED 750HO carb.

Here are some shots of building/machining the engine...

Boring it the cylinders

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Surfacing the block

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Torque plate bolted on, preparing to hone the cylinders

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Honed!

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Weighing parts for the balance

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Scat crank

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Balancing the crank

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Checking pin bore clearances.

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How to drive a car that has an automatic with a manual valve body and a transbrake
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Originally Posted by mw66nova View Post
hold brake, floor it, release brake on last yellow, pull handle back upon shift light illumination, repeat, steer car straight, pull chute, let off gas, squeeze brakes, collect money and bitches
SEE MY BUILD THREAD HERE.

Twin Turbo 400ci SBC in the works.
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Old 05-23-2012, 03:17 PM   #2
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Car: 1986 Z-28
Engine: Twin Turbo Dry sump 400ci SBC
Transmission: Trans Specialties Reid case Glide
Axle/Gears: 3.25 Moser 9"

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Re: My Vortec headed 383 - Dyno Results!

Block all washed up

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Block painted w/ cam bearings and plugs installed.

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Checking bearing clearances

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Crank and cam in.

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Degreeing the cam, I advanced it 2 degrees.

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Checking my rod bearing clearance

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Gapping piston rings

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Assembling the rods and pistons

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Old 05-23-2012, 03:21 PM   #3
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Car: 1986 Z-28
Engine: Twin Turbo Dry sump 400ci SBC
Transmission: Trans Specialties Reid case Glide
Axle/Gears: 3.25 Moser 9"

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Re: My Vortec headed 383 - Dyno Results!

All together and in the engine...

Click the image to open in full size.

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Shortblock almost done.

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Checking rotating clearance on the pan, had to notch it for the lokar dipstick. Thats it.

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Bolted up

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Porting the exhaust ports

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Valve job and blending done to the bowls

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Crower Enduro stainless bodied 1.6 ratio 7/16" stud rockers

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Isky adjustable guideplate to get the rocker tips to sit properly

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Old 05-23-2012, 03:26 PM   #4
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Join Date: Sep 2006
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Car: 1986 Z-28
Engine: Twin Turbo Dry sump 400ci SBC
Transmission: Trans Specialties Reid case Glide
Axle/Gears: 3.25 Moser 9"

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Re: My Vortec headed 383 - Dyno Results!

I was originally goign to run a Comp dual spring, witha crower titanium retainer but I wanted to lighten up the valve train so I switched to a beehive witha steel retainer. Big weight savings

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Porting all finished up

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cc'ing the chambers

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Spring pockets machined to fit a ID style of locator

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A bunch of material ground out of the pushrod area

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Surfacing the heads

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Porting the intake

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Heads surfaced

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Old 05-23-2012, 03:35 PM   #5
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Car: 1986 Z-28
Engine: Twin Turbo Dry sump 400ci SBC
Transmission: Trans Specialties Reid case Glide
Axle/Gears: 3.25 Moser 9"

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Re: My Vortec headed 383 - Dyno Results!

Stud bosses milled .400"

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Lapped the valves

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Figured out my pushrod lengths

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Did a mock assembly to check PTV etc... had .140"+ PTV on both the intake and exhaust, brow clearance was good aswell.

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Heads fully assembled

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Bolted on

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Guideplates fit and studs torqued down where I want them

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Manton 5/16" .118" wall 7.300" pushrods

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Old 05-23-2012, 03:39 PM   #6
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Car: 1986 Z-28
Engine: Twin Turbo Dry sump 400ci SBC
Transmission: Trans Specialties Reid case Glide
Axle/Gears: 3.25 Moser 9"

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Re: My Vortec headed 383 - Dyno Results!

Rockers installed

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We lube the pushrod and valve tips with this

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Filled with Joe gibbs breakin oil

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Checking port alignment

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Intake bolted up and sealed, primed it, had 60psi oil pressure, had oil to all 16 rocker in under 20 seconds.

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Pretty much ready for the dyno.

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Old 05-23-2012, 03:53 PM   #7
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Car: 1986 Z-28
Engine: Twin Turbo Dry sump 400ci SBC
Transmission: Trans Specialties Reid case Glide
Axle/Gears: 3.25 Moser 9"

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Re: My Vortec headed 383 - Dyno Results!

Bolted it up to the dyno friday night, my hooker supercomp headers wouldnt fit so I bolted up a set of out 1 3/4" dyno headers.

Started the jetting out at 72's in all 4 corners with 4.5" power valves, First pull it made 451HP, and 472 ft-lbs of tq.

Took two jet sizes out of it and made another pull, 455 HP and 475 ft-lb's of tq.

BSFC was telling us the fuel curve was where is need to be, So I gave it another 2 degrees advance (34-36) which picked up the HP a bit

We figured it wanted more plenum volume so we tried a 1" open carb spacer which woke it up alot. W/ 36 degrees total timing, 70's all around it made 466hp, and 486 ft lb's of tq.

We had a bit to much oil pressure, so we drained the breakin oil, cut open the oil filter, which was clean, and filled it up with Joe Gibbs 10w30 synthetic hot rod oil. We also blended the 90 degree edge where the choke horn was milled off and jetted the primaries up 1 size to a 71. Opened up the high speed air bleeds 0.005" as it was a little fat in the top end. This pull brought us to out final numbers 474HP @ 5500RPM, and 493 ft-lbs of tq @ 4800RPM. It made over 420 ft lbs of tq at 3000 RPM and carried it to 6000RPM. Overall I am very happy with the results considering its a GM head casting with dual plane intake.

Here is a video of the second to last pull

http://www.youtube.com/watch?v=ni0xCy9bmTM
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Old 05-23-2012, 04:02 PM   #8
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Re: My Vortec headed 383 - Dyno Results!

Nice results, can't wait to see some ET's out of it. Also it gives me some ideas for my old vortecs that are sitting around. Hopefully my AFR vortecs make as much power as yours did.

-Jim
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Old 05-23-2012, 04:07 PM   #9
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Re: My Vortec headed 383 - Dyno Results!

You don't have any more pictures do you? :-) Nice job.
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Old 05-23-2012, 04:33 PM   #10
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Join Date: Sep 2006
Location: Edmonton, Alberta, Canada
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Car: 1986 Z-28
Engine: Twin Turbo Dry sump 400ci SBC
Transmission: Trans Specialties Reid case Glide
Axle/Gears: 3.25 Moser 9"

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Re: My Vortec headed 383 - Dyno Results!

Quote:
Originally Posted by Cosmik Debris View Post
You don't have any more pictures do you? :-) Nice job.
Yah, look at my build thread haha.
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How to drive a car that has an automatic with a manual valve body and a transbrake
Quote:
Originally Posted by mw66nova View Post
hold brake, floor it, release brake on last yellow, pull handle back upon shift light illumination, repeat, steer car straight, pull chute, let off gas, squeeze brakes, collect money and bitches
SEE MY BUILD THREAD HERE.

Twin Turbo 400ci SBC in the works.
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Old 05-25-2012, 03:27 PM   #11
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Re: My Vortec headed 383 - Dyno Results!

I just found this thread, sounds like you did something very similar to what I had in mind. Guess I won't be worrying about the power LOL! I was hoping for 425 or so. But it seems like I'll getting what I want and then some. Where is your build thread so I'm not digging through all the threads looking for yours.
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Old 05-25-2012, 08:51 PM   #12
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Re: My Vortec headed 383 - Dyno Results!

Once you get it installed, it sure would be interesting to see a chassis dyno result! I always see engine dyno numbers, or chassis dyno numbers, but rarely both.

I enjoyed the pics, real nice build and that's gonna be one torque monster engine. Good luck with traction on the street.
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Old 05-25-2012, 10:14 PM   #13
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Re: My Vortec headed 383 - Dyno Results!

Good results.
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Old 05-28-2012, 10:44 AM   #14
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Join Date: Sep 2006
Location: Edmonton, Alberta, Canada
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Car: 1986 Z-28
Engine: Twin Turbo Dry sump 400ci SBC
Transmission: Trans Specialties Reid case Glide
Axle/Gears: 3.25 Moser 9"

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Re: My Vortec headed 383 - Dyno Results!

Quote:
Originally Posted by L695speed View Post
I just found this thread, sounds like you did something very similar to what I had in mind. Guess I won't be worrying about the power LOL! I was hoping for 425 or so. But it seems like I'll getting what I want and then some. Where is your build thread so I'm not digging through all the threads looking for yours.
There is a link to it in my sig.
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How to drive a car that has an automatic with a manual valve body and a transbrake
Quote:
Originally Posted by mw66nova View Post
hold brake, floor it, release brake on last yellow, pull handle back upon shift light illumination, repeat, steer car straight, pull chute, let off gas, squeeze brakes, collect money and bitches
SEE MY BUILD THREAD HERE.

Twin Turbo 400ci SBC in the works.
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Old 05-28-2012, 10:44 AM
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