Quote:
Originally Posted by Shownomercy
And how would you do it without removing the pistons anyway? Dumb response.
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You don't need to remove the piston to replace a crank. Once you unbolt the mains and rods the crank will come out and the piston/rods stay in the cylinders.
To add to Featherburner's response:
There is actually allot of work that needs to be done to install a stroker crank, doing it to a high mile engine isn't that big a deal, just a few more things the machine shop would need to verify/do. (deck/line bore probably would be needed on an older block, a newer one
may not need it?:
When you install a stroker crank, the larger diameter of the crank or "throw' of the crank will typically result in the stock piston skirts (bottom of the piston ) hitting the crank, or even pushing the pistons up into the valves. So you would need pistons designed for use with a stroker crank. The pistons would be shorter so they clear the crank, and the wrist pin would be relocated so at TDC the piston is not going up too far. Also depending on the size of the cam lobes you may need to replace or modify your connecting rods as they can make contact with the cam. The block itself needs to be machined/clearance to accept the larger diameter crank as well (so to do this, the pistons + rods would need to be removed.) A machine shop would remove material from the bottom of the cylinder walls and the sides of the block.
In addition, you can change the length of you connecting rods which will effect the time the piston stays at TDC. Now there are a few different ideas on this as far as which is better, but my point here is that if you change rod length, then you need piston designed for that as well. If you look at a catalog, you'll see pistons listed for CI and rod length.
All that said, unless you have a real need to run a 305 block or keep within a given displacement stroking a 305 is really not all that cost effective. I typical build would be .30 over and a 3.75 crank, this would yield a 334CI engine, so after spending the money you're still under the displacement of a stock block 350.