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. | ||
| + | Really? What if they want more power below 3000 RPM? Then 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. | ||
| + | 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. | ||
| + | Most of the '70s, '80s and early '90s pickups had around 7.9:1 compression with flat-top pistons and large "open" combustion chambers. | ||
| + | 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. | ||
| + | Since you're probably stuck with peanut ports, you can have a lot o fun with them if you build for them, and aren't after a big HP number. | ||
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==Suppliers== | ==Suppliers== | ||
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