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| | Replace peanut port heads on dish piston truck engines with oval port closed chamber heads for a quick and relatively cheap power increase. | | Replace peanut port heads on dish piston truck engines with oval port closed chamber heads for a quick and relatively cheap power increase. |
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| − | Power below 3000 RPM:
| + | Not necessarily, but if this newb-to-454s is gonna delete 170 words I typed, then I'll remove the rest. |
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| − | The larger intake ports are the wrong move entirely. In fact, peanut-ports with good valves but no porting, on a domed-piston 9.5:1 454, will do 446 HP with a street-friendly cam, headers and a decent intake.
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| − | Peanut-ports on a 454 will typically give peak HP at 4900 RPM, with cams from 212 to 228 degrees, at 0.050", of intake duration.
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| − | Swapping to the large-oval (intake port) heads will help by 3000 RPM.
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| − | Most of the '70s, '80s and early '90s pickups had around 7.9:1 compression with flat-top pistons and large "open" combustion chambers.
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| − | None of the "closed" -chamber heads had hardened exhaust seats needed for unleaded gasoline, and these heads are coveted, plus the production numbers were far less than the peanut ports.
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