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Late WD -40 block

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Michael Crowe View Drop Down
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Joined: 11 Sep 2009
Location: Kansas City
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    Posted: 05 Feb 2013 at 7:36am
How long of a stroke can you fit into this block. I have the block for sale and the potential buyer has asked that question. Thanks michael
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wi50 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wi50 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2013 at 7:54am
It's going to depend on crankpin size and the rod they wish to use. With a smaller 2" crankpin and a well designed billet rod 5.75 would likely fit verry easy with room to spare and no block clearance. 6" would likely not take much work.

It's all going to depend on rod cap angle, rod profile and the size of the crankpin.

With a straight cap rod 5 1/4" might start to get tight. With a canted cap Farmall rod then 5 3/8will fit with verry little work.

I believe block numbers 38 to 40 were a little wider in the crankcase. All the pan rails are the same width but these blocks were wider in the crankcase. I've got one cleaned up in the shop and will throw a 5.4" crank in it later and give you a little better idea.

Edited by wi50 - 05 Feb 2013 at 7:56am
"see what happens when you have no practical experience doing something...... you end up playing with calculators and looking stupid on the internet"
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