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Old 09-21-2003, 09:36 PM
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stroked 400/ 327 rods

I posted a question about going big with a stok 400.I got a few replys and some really good info.I just read about using 327 rods with an offset ground crank to get 415 c.i. What is an offset ground crank and where can i get one? Is it a standard 400 crank?Or is this too much work considering i can buy a crank with a longer stroke and just drop it in?

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Old 09-21-2003, 09:49 PM
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You use your existing crank. The machine shop grinds your crank down to the smaller 327 rod size. The offset means that they are moving the center of the rod journal out on the crank. That is how they increase the stroke and why they use the smaller rods. Does that make sense?

John
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Old 09-21-2003, 09:49 PM
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Offset grinding to small journal used to be common, you set the grinder up so that when its done the outside edge of the rod journal is at stock large journal location, while you are grinding the journal to small journal size, this effectively gives you .050 more stroke.
The biggest drawback is now you have to use small journal rods with their weaker specs and bolts, the other is cost, a crank shop can do 3-4 regular regrinds in the same time it takes to offset grind one crank so you pay the extra labor costs which at todays rates makes new cast cranks from Scat,Eagle,Cat etc more realistic.
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Old 09-21-2003, 09:54 PM
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yeah what he said, I have the hardest time explaining stuff in writing.

john
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