When accelerating at partial throttle the engine runs just fine and has plenty of power but as soon as I really kick it the engine falls flat on its face kicking, spitting and refuses to run right until I get back off the throttle partially, where it continues to run just fine.
Here are the specs on my Ford small block:
408” 351W based stroker motor
Late model 351W factory roller cam block.
Crank: Eagle 4.0” Stroke Rods: Eagle 6.200” Pistons: Probe Industries Forged Aluminum SRS 4.030” bore, Reverse Dome 22cc (Compression ratio should be about 10.09:1 with these pistons and the Edelbrock heads with 60cc chamber volumes)
Cylinder Heads: Edelbrock Performer RPM 2.02” Intake Valves, 60cc chambers
Intake manifold: Edelbrock RPM Air Gap 351W
Carb: Holley Model 4160, 750 CFM, manual choke, vacuum secondary’s #0-3310C
Fuel pump: Summit Mechanical 110 GPH
Camshaft: Mike Forte Custom Grind 510/534 Lift, 222/232 duration at .050, 114 LC
Camshaft Hydraulic Roller Lifters: Ford M-6500 R302
Roller Rocker Arms: Competition Cams #1131-8
Hydraulic Roller Lifter Retainer and Spiders: Ford factory
Crankshaft Damper: Ford Racing Nodular Iron, external balance #M-6311-K351
Oil Pan: Milodon 8 quart
Timing Chain Set: Edelbrock #7811 Performer-Link True Roller chain set
Distributor: MSD Pro Billet Small Diameter, Magnetic Trigger #8478, with vacuum advance
Distributor shaft Steel Gear (#85834) and installation by MSD factory.
Superformance stock Ford Dura Spark ignition module coil
Spark Plug Wires: Ford Racing black 9 MM
Spark Plugs: Champion RC12YC (Recommended by Edelbrock for use with their alum heads). Spark plug gap: 036”
Ignition timing is about 15 degrees initial, 21 mechanical for a total of 36 degrees all in at about 3,100 RPM
When accelerating at partial throttle the engine runs just fine and has plenty of power but as soon as I really kick it the engine falls flat on its face kicking, spitting and refuses to run right until I get back off the throttle partially, where it continues to run just fine. I replaced the coil which made no difference.
The vacuum secondary’s are running the Holley stock Black spring which I understand is the heaviest spring available and I know, given the light weight of my car, I need a much lighter spring. Could this be the problem with my car?
Thanks for any advice or feedback you can give me here.
-Tim