That will be dependent on the rod used and the crankpin diameter. But if you're useing stock rods you'll run out of room sooner than canted cap rods with a smaller journal.
Also on canted cap rods, there's usually plenty of material to remove.
So it's a bit of an open ended question, but if you have stock rods, by 5.25 stroke things may take a little grinding, just guessing. The Leroi rod may be a little advantage here.
If you're welding the crank anyway, use a different rod. I use some Farmall H and 350 rods time to time and they fit pretty well, and are much stronger than the Allis rods. Some guys use Buda rods but they bend pretty easy, and are not that strong to start with. Fine in lower hp applications. I'll try and narrow rods and berrings also to help keep things stronger. I used the Farmall rods out to 5.75" stroke in the D-17 block and it gets tight, and takes a lot of cutting. I've heard of a few guys going to 6" with them, but they also say they'll never do it again.
I've seen some differences in the WD-45 blocks, some have a little divit cast under the distributer, which is where things will hit. I just did one with a 5.375 stroke and the Farmall rods and only had to relieve this a little bit to clear.
But some guys go out to 6.25 stroke with lots of clearance and custom rods, small crankpins, etc. Just depends on how hard someone wants to work, what someone wants to do, and how much you wish to spend.
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mlpankey wrote:
