Personal 380 SBC Dyno

[user-9274568]

Chris Cobb built a 385 with a set of my 220cc import heads. Here is the run down..

Flow:
4.060 fixture
.200 144/106
.300 205/144
.400 253/179
.500 278/206
.600 293/222
.700 297/234
.800 302/243
.900 305/250
1.00 308/255

Engine:
385 cid
4.040" bore
3.750" stroker
6.000" rod
Compression: 13.02 to 1
JE Sportsman Piston 7 cc dome - 1/16, 1/16, 3/16 ring package
Kevko Full Length Kick Out Box Oil Steel Oil Pan
Mellings 10555 Oil Pump
SRH 2.5V 220cc Import Fully CNC Ported Castings - 2.055 Intake Valve
MSD Crank Trigger and Distributor
Moroso Ultra 40 Wires
Cometic Head Gaskets
Comp CS288 Solid Roller 260/268 101 ICL/106LSA .704/.672 Gross
Jesel 1.6 / 1.6 Shaft Rockers
Valve Springs: 270 lbs seat and 610 lbs open
Titanium Retainers
SRH Holley 300-110 Burr Finish Intake Manifold
2" Open Spacer
1000 HP - 4150 Holley Carb
VP113 Fuel
Joe Gibbs BR30 Break In Oil
1 3/4" Header with 30" primary length
Star Vacuum Pump and Mandrel Drive (14 - 15.6 " vacuum)

It made:
Best Hp: 655.1 @ 6600 rpm
Best Torque: 550.2 @ 5200 rpm
It's still making 646 at 7500 rpm and the torque cure is flat as Kansas.
Average HP: 614.6
Average Torque: 520.0
Test Range: 5000 to 7500 rpm

It ran:
5.88@2700 lbs in his 3rd gen Camaro
1560 DA
1991 Camaro RS
Weight: 2700 lbs with driver (213 lbs)
36" Ladder Bars
Santhuff Double Adjustable Rear Shocks with 125 lb springs
Rear Gear: 4.78
3 1/2" Aluminum DriveShaft
Rear Tire: 275 Hoosier Drag Radial on 15 x 10 Wheel
Powerglide Transmission with 1.80 first gear ratio
8" PTC converter - 5800 Stall speed (drops to 6100'ish on 1-2 shift)
Santhuff Front Struts with coilover kit and 150 lb springs

It's getting ready to go back on the dyno and looking to make 700hp with a new Jones cam and few updates. I know for a fact the port shape on the 205cc is much better. I also know that Whiteners carb is worth HP.

[user-9274568]

PS.. I know for a fact the engine doesn't nose over!

[statsystems]

Chris Cobb built a 385 with a set of my 220cc import heads. Here is the run down..

Flow:
4.060 fixture
.200 144/106
.300 205/144
.400 253/179
.500 278/206
.600 293/222
.700 297/234
.800 302/243
.900 305/250
1.00 308/255

Engine:
385 cid
4.040" bore
3.750" stroker
6.000" rod
Compression: 13.02 to 1
JE Sportsman Piston 7 cc dome - 1/16, 1/16, 3/16 ring package
Kevko Full Length Kick Out Box Oil Steel Oil Pan
Mellings 10555 Oil Pump
SRH 2.5V 220cc Import Fully CNC Ported Castings - 2.055 Intake Valve
MSD Crank Trigger and Distributor
Moroso Ultra 40 Wires
Cometic Head Gaskets
Comp CS288 Solid Roller 260/268 101 ICL/106LSA .704/.672 Gross
Jesel 1.6 / 1.6 Shaft Rockers
Valve Springs: 270 lbs seat and 610 lbs open
Titanium Retainers
SRH Holley 300-110 Burr Finish Intake Manifold
2" Open Spacer
1000 HP - 4150 Holley Carb
VP113 Fuel
Joe Gibbs BR30 Break In Oil
1 3/4" Header with 30" primary length
Star Vacuum Pump and Mandrel Drive (14 - 15.6 " vacuum)

It made:
Best Hp: 655.1 @ 6600 rpm
Best Torque: 550.2 @ 5200 rpm
It's still making 646 at 7500 rpm and the torque cure is flat as Kansas.
Average HP: 614.6
Average Torque: 520.0
Test Range: 5000 to 7500 rpm

It ran:
5.88@2700 lbs in his 3rd gen Camaro
1560 DA
1991 Camaro RS
Weight: 2700 lbs with driver (213 lbs)
36" Ladder Bars
Santhuff Double Adjustable Rear Shocks with 125 lb springs
Rear Gear: 4.78
3 1/2" Aluminum DriveShaft
Rear Tire: 275 Hoosier Drag Radial on 15 x 10 Wheel
Powerglide Transmission with 1.80 first gear ratio
8" PTC converter - 5800 Stall speed (drops to 6100'ish on 1-2 shift)
Santhuff Front Struts with coilover kit and 150 lb springs

It's getting ready to go back on the dyno and looking to make 700hp with a new Jones cam and few updates. I know for a fact the port shape on the 205cc is much better. I also know that Whiteners carb is worth HP.

First thing I looked at wasn't flow numbers, but did the head continue to flow up to 1.00 without taking a nose dive.

I like it.

[user-9274568]

First thing I looked at wasn't flow numbers, but did the head continue to flow up to 1.00 without taking a nose dive.

I like it.

If it doesn't keep flowing, it still needs work.

[maxracesoftware]

Chris Cobb built a 385 with a set of my 220cc import heads. Here is the run down..

Flow:
4.060 fixture
.200 144/106
.300 205/144
.400 253/179
.500 278/206
.600 293/222
.700 297/234
.800 302/243
.900 305/250
1.00 308/255

Engine:
385 cid
4.040" bore
3.750" stroker
6.000" rod
Compression: 13.02 to 1
JE Sportsman Piston 7 cc dome - 1/16, 1/16, 3/16 ring package
Kevko Full Length Kick Out Box Oil Steel Oil Pan
Mellings 10555 Oil Pump
SRH 2.5V 220cc Import Fully CNC Ported Castings - 2.055 Intake Valve
MSD Crank Trigger and Distributor
Moroso Ultra 40 Wires
Cometic Head Gaskets
Comp CS288 Solid Roller 260/268 101 ICL/106LSA .704/.672 Gross
Jesel 1.6 / 1.6 Shaft Rockers
Valve Springs: 270 lbs seat and 610 lbs open
Titanium Retainers
SRH Holley 300-110 Burr Finish Intake Manifold
2" Open Spacer
1000 HP - 4150 Holley Carb
VP113 Fuel
Joe Gibbs BR30 Break In Oil
1 3/4" Header with 30" primary length
Star Vacuum Pump and Mandrel Drive (14 - 15.6 " vacuum)

It made:
Best Hp: 655.1 @ 6600 rpm
Best Torque: 550.2 @ 5200 rpm
It's still making 646 at 7500 rpm and the torque cure is flat as Kansas.
Average HP: 614.6
Average Torque: 520.0
Test Range: 5000 to 7500 rpm

It ran:
5.88@2700 lbs in his 3rd gen Camaro
1560 DA
1991 Camaro RS
Weight: 2700 lbs with driver (213 lbs)
36" Ladder Bars
Santhuff Double Adjustable Rear Shocks with 125 lb springs
Rear Gear: 4.78
3 1/2" Aluminum DriveShaft
Rear Tire: 275 Hoosier Drag Radial on 15 x 10 Wheel
Powerglide Transmission with 1.80 first gear ratio
8" PTC converter - 5800 Stall speed (drops to 6100'ish on 1-2 shift)
Santhuff Front Struts with coilover kit and 150 lb springs

It's getting ready to go back on the dyno and looking to make 700hp with a new Jones cam and few updates. I know for a fact the port shape on the 205cc is much better. I also know that Whiteners carb is worth HP.

correlates very nicely :

Code: Select all

384.56863991 Cubic Inches at 6600 RPM with Intake System = 111.33000 % PerCent Volumetric Efficiency
Complete Intake System Flow @28 inch =  272.5430 -to- 291.8548 CFM at 0.66784 Lift (6.00 % Flow Loss)
Cylinder Head  Intake Port Flow @28 inch =  287.2314 -to- 307.5839 CFM at 0.66784 Lift (117.33000 Ve%)
Cylinder Head Exhaust Port Flow @28 inch =  210.8247 -to- 230.7239 CFM at 0.63128 Lift (no Flow Pipe)

Dyno HP Weather Correction Equation = 8•  SAE J607 (June1974) • STP • SuperFlow-FTQ • (Default)
Fuel BTU= 19000.0  Air/Fuel Ratio= 12.0000  BSFC= 0.47618  Mixture Distribution= 90.0  Quality= 90.0
Fuel Type= Gasoline•Race Gas•Oxygenated High HP & TQ    ( Potential Peak TQ= 569.8  Peak HP= 654.4 )
---------------------------------------------------------------------------------------------------
                                  Camshaft Level = 10  Peak HorsePower and Peak Torque
400 RPM/Sec Dyno Test             Minimum        Average         Normal        Maximum
Peak HorsePower    @  6600 RPM      630.8          638.8          646.9          655.1
Peak Torque Lbs-Ft @  5200 RPM      551.5          563.1          570.2          577.4

HorsePower per CID                  1.640          1.661          1.682          1.703
Torque per Cubic Inch               1.434          1.464          1.483          1.502
Peak Torque BMEP in psi             216.2          220.8          223.6          226.4
Carb CFM at 1.5 in Hg.                862            959           1007           1056

DragStrip ET = 5.880 1/8th Mile @ 1560 DA

it would need about Peak HP=651.3 Torque=564.9 ( pretty close to your 655.1 HP and 550.2 TQ )
depends greatly on a full 1/4 mile Run ET Slip Data for more accuracy

i approximate for 5.880 a full run would be :
60= 1.2890 50.1386
330= 3.7920 93.7514
660= 5.8800 116.5262
1000= 7.7341 133.1572
1320= 9.3000 144.0928

2700.0 Lbs
21.0 FA
0.380 CD
6600 Peak HP RPM
1560.0 Ft DA
100.0% HoodScoop
Torque Converter

[Erland Cox]

Really well done! What block are you using?

Erland

[user-9274568]

Thanks Larry!!

Both Chris and my build were stock blocks.

I'm doing a block this winter.

[Erland Cox]

What have you have to do to make the block stay together?

Erland

[statsystems]

What have you have to do to make the block stay together?

Erland

PRAY. ALOT.

[user-9274568]

My block has 4 bolt caps, studs, filled to the bottom of the water pump. It still scares me, a lot...

[maxracesoftware]

My block has 4 bolt caps, studs, filled to the bottom of the water pump. It still scares me, a lot...

i respect your OEM Block concerns !

but ,
its sort like saying no one could build an engine and make high RPM HP back in the 1960,70's,80's

what about the Martin Brother's little Chevy II and then their AMC Gremlin ??
.... everyone , all the Fans , use to run up to the fence and watch the little Martin Bros Chevy II make a hi RPM Run
and Bill Jenkins ProStockers SBC 331's , Reher-Morrison- Lee Sheperd, Nickens Bros, etc

all the Racers/Engine Builders routinely turning 9000+ RPMs back then

i use to turn my C/ED 316 2-bolt main Chevy II Block 10600 to 11000 RPM thru the lights

my old 355cid Hecho in Mexico Block w/ stock GM 3.480 steel crank with Rod Journals turned down 0.102" off to small journals
had .004" Rods and Mains clearances M55HV oil pump
8000 Stall ... never saw anything under 8000 RPM , shifted 9200-9300 crossed always 9700 to 10000 RPMs
ran that engine 2 years ... sold it for cash + 65 Corvette ... that Racer ran it for a year in an Altered ... he traded back for the Corvette
i ran a half-season more ... now its going to be a 377cid when i get free time

[user-9274568]

My block has 4 bolt caps, studs, filled to the bottom of the water pump. It still scares me, a lot...

i respect your OEM Block concerns !

but ,
its sort like saying no one could build an engine and make high RPM HP back in the 1960,70's,80's

what about the Martin Brother's little Chevy II and then their AMC Gremlin ??
.... everyone , all the Fans , use to run up to the fence and watch the little Marting Bros Chevy II make a hi RPM Run
and Bill Jenkins ProStockers SBC 331's , Reher-Morrison- Lee Sheperd, Nickens Bros, etc

all the Racers/Engine Builders routinely turning 9000+ RPMs back then

i use to turn my C/ED 316 2-bolt main Chevy II Block 10600 to 11000 RPM thru the lights

my old 355cid Hecho in Mexico Block w/ stock GM 3.480 steel crank with Rod Journals turned down 0.102" off to small journals
had .004" Rods and Mains clearances M55HV oil pump
8000 Stall ... never saw anything under 8000 RPM , shifted 9200-9300 crossed always 9700 to 10000 RPMs
ran that engine 2 years ... sold it for cash + 65 Corvette ... that Racer ran it for a year in an Altered ... he traded back for the Corvette
i ran a half-season more ... now its going to be a 377cid when i get free time

This is a very good point!!

[statsystems]

My block has 4 bolt caps, studs, filled to the bottom of the water pump. It still scares me, a lot...

i respect your OEM Block concerns !

but ,
its sort like saying no one could build an engine and make high RPM HP back in the 1960,70's,80's

what about the Martin Brother's little Chevy II and then their AMC Gremlin ??
.... everyone , all the Fans , use to run up to the fence and watch the little Martin Bros Chevy II make a hi RPM Run
and Bill Jenkins ProStockers SBC 331's , Reher-Morrison- Lee Sheperd, Nickens Bros, etc

all the Racers/Engine Builders routinely turning 9000+ RPMs back then

i use to turn my C/ED 316 2-bolt main Chevy II Block 10600 to 11000 RPM thru the lights

my old 355cid Hecho in Mexico Block w/ stock GM 3.480 steel crank with Rod Journals turned down 0.102" off to small journals
had .004" Rods and Mains clearances M55HV oil pump
8000 Stall ... never saw anything under 8000 RPM , shifted 9200-9300 crossed always 9700 to 10000 RPMs
ran that engine 2 years ... sold it for cash + 65 Corvette ... that Racer ran it for a year in an Altered ... he traded back for the Corvette
i ran a half-season more ... now its going to be a 377cid when i get free time

What was the HP/CID on those early engines...if you don't mind my asking?

[Erland Cox]

A 400 block is a very different thing from a 4" bore block.
I see no problems with 4" or smaller blocks N/A without power adders but the 400 block is fragile.
Do you use cap plugs in the decks?

Erland

[David Vizard]

For the record, I like you Charlie. I am not trying to be a dick. I just don't believe port energy is an important thing to measure. Carl Foltz, pretty sure he doesn't use it either. He had heads on what 10 of the 16 car pro stock field last weekend? Like I said, I am 99.9% sure that Chad didn't use port energy as a consideration when he did that port, or any port on any head he offers. Neither does Darin Morgan, Slick Rick, Larry Meaux, Sonny Leanord, etc. Have they maybe calculated it once or twice on something they have done after seeing it? Maybe. Here is their response. "oh, that's neat". Haven't done it since. I understand the concept, I just think its filler for a program that isn't as good as 3 or 4 that already exist.

As far as Chads roadster, ok, he has 1 pass on it, can't judge it from that, I apologize. But, 2000lbs, which I am 99% sure it weights, + or - 100 lbs, with that power, should 60ft 1.15. It went 1.34, that was with wide open throttle. It should go mid 8's or faster. We will see.

I am not quite sure as to how many of the guys you mention the concept of port energy and energy density has filtered down to yet so it is hardly surprising they are possibly not using it.
DV