Originally Posted by chevy69er
okay so here is the thing im about to buy a 62 4 door bel air it needs work but for only 400!! but the guy said its a 305 board to a 327 how do i know this is legit i mean im only 18 and know enough to get me by and my dad was gonna help me rebuild my 69 chevelle so is this worth it??could i even part out the 62 and even make any money off the parts??please help me lol
You'd get very wet trying to bore a 305 to that of a 327. There are, however, stroker crankshafts which will take a 305 into the range of a 327 but this is vastly different to boring an engine as this takes a new crankshaft along with the pistons. Using a crank intended to make a 350 into a 383, when used in a 305 will increase its size to 328, since this is usually accompanied with a .030 inch overbore you get 332, which is a common upgrade to to the 305 sold as a kit.
The 327 from the factory uses a 4 inch bore and a 3.25 inch stroke. The 305 uses a 3.736 inch bore and the 350's 3.48 inch stroke. The wall thickness of a 305 is not enough to accommodate the .264 inch (more than a quarter inch at .25") and have any strength left. The blocks between these engines are use cylinder wall cores of different thickness, so while the outside looks the same and they will interchange most parts internally and externally, the 305 just can't be bored to 4 inches so they don't share pistons and their crankshaft balance is different, so even though a 305 and 350 have the same stroke and the shafts will interchange in the block, the counterweights are different by size and weight. The 383 build on a 350 uses a crank with a 400 stroke (3.75 inches) with a .030 inch overbore on the 350's 4 inch bore. The 332 build on a 305 uses the 383 crank with the 3.75 inch stroke with a .030 inch overbore on the 305's 3.736 inch bore. Unless the 332 crank is purpose built for the stroker 305, it would be a rebalanced (lighter) 383 crank. The old 400 crank has larger diameter bearing journals and can't be fitted to a 350 or 305 block without turning the journals to a smaller diameter so it would fit into the 350 or 305 block's main bearing saddles. But his is where all this small block stroking started.