Rusty's Second Dyno Test

[Gregski]

In Rusty's Baseline Dyno Test over a year ago, my 1974 350 SBC pulled almost 190 horse power at the rear wheels and almost 270 foot pounds of torque @ 3000 RPM. That was in stock form (points distributor, Quadrajet carb, exhaust manifolds, etc.) with only LMC Truck's dual turbo muffler exhaust system on it.

The ultimate goal is 1 hp per cubic inch, so 350 hp, however we want this to be a daily driver with decent idle. So after doing a top end upgrade here are the new numbers:

225 HP and 270 TQ at 4500 RPM

The carburetor appears to be the main limiting factor.

Current Specs:

GM H.E.I. Distributor P/N 93440806
- 10° Initial Timing
- 32° Total Timing
- no vacuum advance

Holley 4160 Vaccum Secondary 600 CFM Carburetor P/N 0-80457SA
- 65 Primary Metering Jet (need to double check this)
- 65 Primary Power Valve
- 0.031 Pump Discharge Nozzle

GM Dual Plane Intake Manifold P/N 12366573

Vortec Cylinder Heads (off of a 1999 Chevrolet Suburban)
- 1.94" Intake / 1.50" Exhaust Valves
- 64cc Chambers

Chevrolet Performance Hydraulic Flat tappet Camshaft P/N 24502476
- 212° / 222° @.050" Duration
- .435" / .460" Valve Lift
- 112° Lobe Separation

Note: we had to go to a new shop to get this test done since the first shop closed down.