Editing Hotrodding the BBC 454 engine

==Intro== ==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. Smaller chamber heads like the c/n 215 could be used for better compression than the larger chambers found on c/n 049 or 781 heads. ==Power below 3000 RPM:== 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 heads on a 454 will typically give peak HP at 4900 RPM, with cams from 212 to 228 degrees intake duration at 0.050" lift. Swapping to the large-oval (intake port) heads can help make power further up the rev range. 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. ==References== [http://www.carcraft.com/techarticles/ccrp_1010_cheap_big_block_chevy_engine_build/index.html Car Craft 454 build] baselined with peanut port heads, 446 hp at 4,900 rpm and 542 lb-ft at 3,600 rpm [[Category:Engine]] [[Category:Undeveloped articles]] [[Category:GM]]

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