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02-22-2001, 09:37 AM
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Registered Member
Join Date: Oct 2000
Location: Atlanta,GA,USA
Posts: 278
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Stock bore (diameter of cylinder) is 4.00" for 289/302/351. When rebuilding, the diameter of the cylinder is increased to make sure it is straight, because years of use can warp a block. .030 over means the bore was increased to 4.030" It is like re-drilling a hole larger to make sure it is the right shape.
Boring requires pistons for the new bore size. Boring also increases displacement. Your 351W will now be 363 cubic inches. ------------------ 67 Fastback - Arctic White Pearl paint 351W ,Trick Flow Aluminum Heads, Edelbrock TorkerII, Carter 750 CFM, Comp. Cam 477/510 219/233@.050, Performance Automatic C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars. My 351W Fastback |
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