WebAug 17, 2007 · That's a 4" stroke instead of 3.75". oh boy. A 350 inch engine gives about 5 cubes per .030" over. A 400 cube engine gives about 6 cubes per .030" over. 400 has about the same stroke as a 396 and 427, it's 3-3/4". I'd like to see the formula J used to get 450 cubes, just out of curiousity. squirrel, Aug 16, 2007. WebFeb 19, 2015 · Pontiac settled on a 3.75-inch bore and 3.25-inch stroke to produce a 287-ci package. ... A complete over-the-counter parts package with the sole intent of producing a competition-only 389 was released in 1960. ... Pontiac revived a former 400 block casting specifically for 1978–1979 T/A 6.6 engines.
Pontiac Blocks- Bore and Stroke - Butler Performance
WebJun 6, 2024 · With a 4.12-inch bore and a 3.75-inch stroke, Pontiac’s 400 had similar bore and stroke to Chevy’s big-block 396 (even when the Chevy actually displaced 402 cubic … Webmultiply your bore size by the ring end gap factor listed on the chart (i.e., Street Naturally Aspirated 4.000” bore x .0065” gap factor = .026” total top ring end gap). Your hypereutectic performance piston will expand less than typical cast or forged pistons. Because of this and the wear characteristics of the dartmouth university niche
Pontiac GTO Questions - Should I modify my original 389?
WebMar 21, 2024 · A Pontiac 400 bored 30 over is an engine that has been bored out to a larger capacity. This engine has a displacement of 400 cubic inches, making it one of the largest … WebJan 14, 2024 · Crate engines of the Chevy 350 range in horsepower from 195 to 800. A compression ratio of 5:1. There are both 2-bolt and 4-bolt models of this engine, while those for cars built after 1987 carry an increased hydraulic roller lifter camshaft to … WebMar 21, 2024 · A Pontiac 400 bored 30 over is an engine that has been bored out to a larger capacity. This engine has a displacement of 400 cubic inches, making it one of the largest and most powerful engines available for Pontiac vehicles. Boring out the engine to a larger size increases the amount of air and fuel that can be drawn into the cylinders, providing … bistro fire table