Ol Ford Guy (11/6/2008)
Can anyone tell me which issue, I think it is a recent one, that had the article by Royce B. about the T-Bird rebuild where they ground down the crank and used SBC rods and gained a little stroke? Is this a good thing to do?Offset grinding the rod journals on a Y crankshaft is by far the most economical way to increase the stroke in the Y. For a 312 crankshaft, you can get up to a 3.52” stroke with a 2.100” journal, 3.62” stroke with a 2.00” journal, and 3.73” stroke with a 1.889” journal. For a 292 crankshaft, you can get up to a 3.38” stroke with a 2.100” journal, 3.48” stroke with a 2.00” journal, and 3.59” stroke with a 1.889” journal. These are all best case scenario numbers and if the crankshaft rod journals have noticable wear or have been previously turned, then the max stroke will not be achieved. You also have to be cautious in any widening of the journals that’s being attempted as it’s easy to intersect the oil galleries in the radius of the journal depending upon the particular crank design that’s being offset ground and how much stroke increase is being targetted for.
Doing a search on this site using “offset grinding, Eagle rods, etc” as the key words brings up a number of past posts regarding increasing the stroke on the Y cranks. Here’s links to some of those threads.http://www.y-blocksforever.com/forums/Topic9269-3-1.aspx
http://www.y-blocksforever.com/forums/Topic2298-5-1.aspx
http://www.y-blocksforever.com/forums/Topic2615-3-1.aspx
http://www.y-blocksforever.com/forums/Topic10709-3-1.aspx

Lorena, Texas (South of Waco)