Blown Big Block Chevy on the Dyno!

Gatecrasher

Well-Known Member
#1
Well it's the moment of truth for my latest project. Time to see what the new supercharged 502 is made of.

Here's the build:
• Gen VI GM HO502 Short Block
• Forged internals
• Dart 360 heads (8.6:1 CR)
• Isky mechanical roller cam
• Jesel shaft rockers
• Jesel belt drive
• BDS 8-71 supercharger
• Twin Quick Fuel 950 cfm double-pumpers
• MSD ignition


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Here's the video link.... 502 Dyno Test


What do you think the max HP and Torque readings were?
 

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mustangfrank

Well-Known Member
#2
Well it's the moment of truth for my latest project. Time to see what the new supercharged 502 is made of.

Here's the build:
• Gen VI GM HO502 Short Block
• Forged internals
• Dart 360 heads (8.6:1 CR)
• Isky mechanical roller cam
• Jesel shaft rockers
• Jesel belt drive
• BDS 8-71 supercharger
• Twin Quick Fuel 950 cfm double-pumpers
• MSD ignition


View attachment 286232
View attachment 286234


Here's the video link.... 502 Dyno Test


What do you think the max HP and Torque readings were?
Video didn't work for me...what is that going in?
 

Gatecrasher

Well-Known Member
#6
The blower produced 5 PSI boost with a 50 tooth crank pulley & a 55 tooth blower pulley (approx. 9% underdriven).

Wanted to get to about 8 PSI boost to max it out on pump gas. Any more boost than that will require higher octane fuel. The goal here is to determine the optimum pulley setup for pump gas that produces the most power without pre-ignition or detonation.

Changed pulleys to 53 tooth crank pulley & a 50 tooth blower pulley (approx, 6% overdriven).

Final results on the dyno (this is the video):
  • 34 degrees timing
  • 8 PSI boost
  • 92 octane pump gas

HP?
Torque?


C'mon guys, any thoughts on the final values?

By the way, this bad boy is part of my pro street Nova SS project.
 

Gatecrasher

Well-Known Member
#14
This is the "street" pump gas setup
  • 92 octane fuel with 8 PSI boost
  • 942 HP @ 7,000 RPM
  • 806 ft/lbs torque @ 4600 RPM
Resized_20220113_140639.jpeg

Next step is to dump in some 110 octane race fuel and see how much boost I can get away with. That will be the "off-road" setup. Should easily be above 1,000 ponies.
 
#15
Excellent!! Nice to a fresh blown big block build, so tired of all this LS stuff everywhere. That thing would look great sticking out of the hood on one of my B Body wagons:cool:
 

Gatecrasher

Well-Known Member
#16
This is what it is going in....

1964 Nova SS
  • Full frame with 4-link rear suspension
  • Wishbone track locator
  • Narrowed 9" Ford rear with Wilwood Dynalite II brakes.
  • Front end dropped 5" (Mustang II rack & pinion suspension with polished stainless tubular control arms, QA-1 coil-overs, Wilwood Dynalite II brakes)
  • 10 pt. roll cage with swing-out door bars

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IMG_20211108_164354054s.jpg
 

Lizardking

Well-Known Member
#17
This is what it is going in....

1964 Nova SS
  • Full frame with 4-link rear suspension
  • Wishbone track locator
  • Narrowed 9" Ford rear with Wilwood Dynalite II brakes.
  • Front end dropped 5" (Mustang II rack & pinion suspension with polished stainless tubular control arms, QA-1 coil-overs, Wilwood Dynalite II brakes)
  • 10 pt. roll cage with swing-out door bars

View attachment 286259
View attachment 286260
That Nova is going to fly!!!

Man I miss my 66 Nova.......

I still have an og 66 grille hanging in my garage.
 

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Gatecrasher

Well-Known Member
#18
Next the engine gets installed with custom motor plates. Since the car is slammed the engine will also be raised along with the trans tunnel. The firewall will be recessed and smoothed. It will have a TH400 trans with a Gear Vendors overdrive. The rear is a 9" Ford with Moser Wavtrac and 35 spline axles.

I'll post some pics in a few weeks once the engine is installed.

Here's a link to an MP3 of the engine idling at 900 RPM: 502 Idle

Resized_20220113_125127.jpeg
 
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