Rob Garrett's 461
Official Member of the 1-to-1 Club
Getting ready for dyno run


Rob Garrett of Garland, Texas, has one big project on his hands. That project is the restoration of his 1969 GTO. Rob submitted his stroked 400 engine for consideration into the 1-to-1 Club. As reported on the PSP Restoration Forum, Rob's engine exceeds 1 horsepower per cubic inch of displacement. While the engine is completed and running, Rob continues to work on restoring the car. Below are the specifications of his stroked 400 engine.

Technical Data

General Information
Year & Model 1969 GTO
Weight with Driver Unk.
Curb Weight Unk.
Fuel Level when Weighed Unk.
Engine 1969 400, #9790071, YS Block
Cubic Inches Before/After 400/461
Bore & Stroke 4.155/4.250
Engine built by Rob Garrett
Induction System
Air Cleaner Unk.
Carburetor Make/Model Q-Jet, #17054910
Primary Jetting #73 with .045" rods
Secondary Rods BV
Spacer None
Intake Manifold Stock #9794284; Water crossover separated
Fueling System
Pump RobbMc 1100HP Mech. Pump
Lines 1/2" Stainless hardline & -8 braided hose from tank to filter to pump to regulator
Regulator RobbMc Dual Mode w/ vapor return
Year/Casting #/cc Ram Air IV/722; port matched heads to intake
Porting/Machining Yes
Flow Numbers 282 Intake/220 Exhaust @ .600"; 28" Water
Valve Springs Howards 98634
Valves 2.11"/1.77"; Titanium retainers; 11-deg Super Locks
Installed Height 1.950"
Studs 7/16" BBC style
Push Rods Comp Cams 9.500" (PN 7656-16)
Rocker Arms Scorpion 1.65 (PN SCP1053BL)
Lifters Comp Cams Endure-X mechanical rollers 859-16 Style A
Bottom End
Pistons KB IC967 Pistons
Rings Hastings "race"
Connecting Rods Eagle H-Beam forged 6.625"; King rod bearings
Compression Ratio 9.46:1
Crank Eagle Cast w/ 4.25" stroke, 3" mains; Fed Mogul main bearings
Rotating Assembly Balanced Yes
Damper Pioneer SFI (PN 872031)
Brand Custom grind Comp Cams Mech Roller; .377/.381" lobe lift
Duration at .050 in 236/242 degrees
Advertised Duration 273/279 @ .015" lobe lift
Lift w/ Rocker Arms ..622/.628" (1.65 ratio)
Lobe Separation Angle 110
Installed Position 106 degrees inline center line
Timing Set & Chain Comp Cams 9-way billet double roller
Distributor Proform HEI
Amplifier None
Coil stock type
Wires Davis Unified LiveWires
Spark Plugs AC/Delco 7
Total Mechanical Timing 38
RPM Total Timing Reached 2400 RPM
Idle Setting/RPM 18 @ 850 RPM
Idle Setting Vacuum 12" Hg
Headers Doug Thorley D-567; Jet-Hot extreme sterling coating
Primaries 1.75"
Collectors 3"
Exhaust Pipes Pypes SGA10 SS 2.5" system w/ cut out
Mufflers Pypes Race Pro
Crossover Pype X crossover
Transmission TH 400, built by Hackler Transmission, blue clutches, HD sprag, Trans go shift kit
Converter/Clutch Custom 10" converter by Hackler; SFI flex plate
Shifter Not applicable
Rear Carrier Moser Engineering 9" Ford; WaveTrac posi
Rear Gear Ratio 3.50
Spool None
Axles Moser
Chassis & Suspension
Brakes F/R Wilwood 4 Piston discs; hydroboost powered
Wheels F/R TBD
Tires F/R TBD
Tire Pressure F/R NA
Suspension - Front
Springs Stock
Control Arms Stock with polyurethane bushings
Stabilizer Bar Spohn 1-5/16" Chromoly (PN 926A)
Shocks Strange Engineering single Adjustment
Other Features None
Suspension - Rear
Springs Stock
Control Arms Spohn Chromoly Adjustable w/DelSphere Joints; upper PN 627, lower PN 225
Stabilizer Bar Spohn Pro Touring sway bar (PN 918)
Shocks Strange Engineering double adjustment
Other Features None
Chassis Modifications as noted
"The Rest"
Interior Modifications TBD
Exterior Modifications NA
Safety Modifications TBD
Body Color Black
Launch Technique TBD
Best 1/4mi ET/MPH Not tested
Average 1/4mi ET/MPH Not tested
Average 60' Time Not tested

These are KB IC967 pistons with an increased dish and were installed on the Eagle H-Beam forged rods pictured below.

Eagle H-Beam forged rods

Eagle cast crank with 4.250" stroke

Close-up of the lobes of the Comp Cam Solid Roller

Pistons, rods, and crank are in.

Comp Cams stud girdle keeps everything in alignment.

Under car view of newly installed Pypes SGA10 2.5" exhaust system with X-pipe and cutouts.

Video of Rob's Engine Dyno Test. Video by Rob Garrett.

Engine Dyno Statistics

Engine Dyno Statistics. Click here for enlarged view.