02-25-2005, 02:14 PM
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Senior Club Cobra Member
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Join Date: Aug 2001
Location: Rocky River, Ohio,
OH
Cobra Make, Engine: Everett-Morrison, 347 Tri-power Stroker
Posts: 678
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Not Ranked
What kind of HP/Torque are you looking to make?
My stock heads (with stock valves) make 335HP (not sure right now of the torque, but I believe it was about 350 ft-lbs) at 5200rpm with just a good port job on the intake side. Exhaust ports were left alone.
Over size Chevy valves and a little grinding on the exhaust would make another 20+ I would guess.
If you are going to spin the motor in excess of 5500rpm, would highly recommend larger diameter bolts (ARP) on the rod caps, as this was a weak spot on the 289.
- Dan
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