Hotrodding the BBC 454 engine
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==Specific tips== | ==Specific tips== | ||
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: | ||
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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. | 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. | ||
Swapping to the large-oval (intake port) heads will help by 3000 RPM. | Swapping to the large-oval (intake port) heads will help by 3000 RPM. | ||
| − | Most of the '70s, '80s and early '90s pickups had around 7.9:1 compression with flat-top pistons and large "open" combustion chambers. | + | 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. | 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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