Need Help on Heads on Gen 5 454's
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Need Help on Heads on Gen 5 454's
Neighbor has a pair of stock 330-340 inboards out of his sea ray both standard rotation.Bought a offshore boat with no engines .Wants to use these,>reason for removing them was one had a blown head gasket and he re-powered with fuel injected engines.Now he is removing the heads and was asking if a head and intake manifold change would give him a little more HP.Does not want to get into the lower end.Has small ovel port heads on it now.Just want a little more than 340 HP Just a river boat .Wants to use the engines because they were well taken care of and are closed cooling system .Any thoughts or help would be helpful. Thanks JOHN SR
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grab rectangle ports, dual plane intake, and cam for 46-4700 rpm, should be fine... bottom ends are not the strongest but I dont see the power being enough to worry about anything.
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Ihave seen good success with aluminum oval ports, not sure what budget is, I was thinking cheap budget, Gellner was offering a nice Brodix head already set up for Marine with Inconel, maybe give him a call see if hes still doing it...Dean told me when I was looking at doing my 454, now I went to 540 so thats out the window...
https://www.google.com/url?sa=t&rct=...79908130,d.cGU
https://www.google.com/url?sa=t&rct=...79908130,d.cGU
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Hmm, I thought I'd replied but I guess it did'nt show up.
Mysuggestion is to change to Dart Iron Eagle heads, roller cam, Dart intake and Holley 750. Yoiu will make 450+ hp cheap and relable.
Wannabe
Mysuggestion is to change to Dart Iron Eagle heads, roller cam, Dart intake and Holley 750. Yoiu will make 450+ hp cheap and relable.
Wannabe
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Gm 781 ovals make good power. I had a 330 bottom end. Used 781 ovals, edelbrock performer, comp extreme marine flat tappet, 830 holley, scorpion roller rockers, and imco powerflow exhaust. Made a solid 450hp at 5000 and it ran awesome for years until I overheated it not realizing my tilt switch wasn't working running in shallow water.