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Posted by dave horvath [24.131.120.209] on Saturday, April 23, 2011 at 20:47:11 :
In Reply to: Crate Spifire engine posted by Robert [70.184.66.179] on Friday, April 22, 2011 at 16:49:48 :
Stroke on the 251 is 4 1/2 inches
Stroke on the 265 is 4 3/4 inches
You should be able to insert a wooden dowel into the timing hole above #6 cylinder and carefully rotate the engine. The difference between the lowest(BDC) and highest position (TDC) will be the stroke length.