FE Power Forums
FE Power Forums => FE Technical Forum => FE Engine Dyno Results => Topic started by: blykins on October 17, 2025, 08:25:29 AM
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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
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Well done! Healthy single 4 build should make for a happy owner!
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Is the cam duration listed correct?
266/280 @ .050 is a healthy duration to stop at 6,000rpm, especially with tunnel port heads.
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It is correct.
This is around a 300 cfm head at lift (under 180 on the exhaust side) and you lose about 8-10 degrees of duration at the valve due to valve lash. It flatlined and held the power to about 6500 rpm, but technically 6000 is the first hp rpm peak.
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It's too bad that the heads didn't get the bowl cleanup under the valve. My test heads flowed about 350 on the intake with the 5 angle valve job and the bowl cleanup. Bet it would have picked up a lot of power with that work.
There's another guy going to the dyno soon with the proper bowl preparation, plus one of my 2X4 intakes. Looking forward to seeing how that one does...
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Nice Brent I guess Jays heads are working well. Only 10 to 1 making good power. Love the flat tap pet to me nothing sounds better not even a solid roller. Was that cam nitride.
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Nice Brent I guess Jays heads are working well. Only 10 to 1 making good power. Love the flat tap pet to me nothing sounds better not even a solid roller. Was that cam nitride.
Yes, nitrided cam, EDM tool steel lifters.