Hate to come in behind Blair's big wampuss cat, but thought I would throw this up here as I think (I could be wrong) it's the first dyno test of Jay's Tunnel Port heads. Just as a note, no head work was done, the heads were assembled with SI stainless valves and a PAC valve spring package. No port work. Factory 1x4 Tunnel Port intake had the floors raised/shaped to match the ports in the heads.
Performance Summary:
Cubic Inches: 482 Dyno brand: Stuska
Power Adder: Nope Where dynoed: Dale Meers Racing Engines
Peak Horsepower: 586
Peak Torque: 561
Horsepower and Torque Curves:
Engine Specifications:
Block brand, material, finished bore size, other notes: Robert Pond Motorsports Aluminum
Crankshaft brand, cast or forged, stroke, journal size: Scat 4340 4.250" Stroke
Connecting Rods brand, material, center to center distance, end sizes, bolts: Molnar, 6.700
Piston brand, material (caster, hypereutectic or forged), dish/dome volume, static CR: Custom Mahle, 42cc dish, ~10:1
Main Bearings, Rod Bearings, Cam Bearings brand and size: Calico coated Clevite main/rod bearings, Durabond FP-01 cam bearings
Piston rings brand, size, other notes: Mahle, 1mm/1mm/2mm
Oil Pump, pickup, and drive: Melling M57HV, Canton pickup, ARP shaft
Oil pan, windage tray, oil filter adapter: Canton front road race, no tray, Scott Drake oil filter adapter
Camshaft brand, type (hyd/solid, flat tappet or roller), lift and duration (adv and @.050"): Custom Lykins Motorsports solid flat tappet, 266/280 @ .050"
Lifters brand, type: Trend tool steel EDM
Timing chain and timing cover: Cloyes timing set, Shelby timing cover, Lykins Motorsports adjustable pointer
Cylinder heads brand, material, port and chamber information: FE Power Tunnel Port, SE exhaust ports
Cylinder head flow in cfm at inches of lift (28" H2O pressure drop): 315/180
Flow bench used, location:
Intake valve brand, head size, stem size: SI stainless, 2.250"
Exhaust valve brand, head size, stem size: SI stainless, 1.750"
Valve springs brand, part number, specs: PAC
Retainers and locks brand, part number, specs: PAC
Rocker arm brand, type (adjustable or non-adj), material, ratio: T&D Tunnel Port
Rocker shafts and stands, brand, material:
Pushrods brand, type, length: Smith Brothers
Valve covers, brand, type: Chrome Pentroof
Distributor brand, advance curve information: MSD
Harmonic balancer brand: Powerbond
Water pump brand, type (mechanical or electric): Edelbrock, also turning alternator
Intake manifold brand, material, porting information: Factory 1x4 Tunnel Port
Carburetor(s) brand, type: Scott Perkins 850
Exhaust manifolds or headers brand, type: Dyno headers
