Does anyone know if a k20 crank could possibly fit in a f23 block? Hope this isnt a stupid question.

 

f series and h series are compatible. the k series is a totally different platform so my guess would be no. with the right amount of money if might. but it would be better to just go with a custom crank at that point.

 

not sure about the K20 but the h22 will. I'm assuming you want to destroke the motor to spin it to high heaven. h22 isn't as short a stroke as the k20 but its a significant amount shorter than the f23

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by flight50 &raquo;</TD></TR><TR><TD CLASS="quote">f series and h series are compatible.</TD></TR></TABLE>

Only to a point... You can't just throw just any H-series crank into any F-series block, or vice versa.

The F23 has 55mm main journals, so you would need to find a 98+ H22 crank which also has 55mm main journals. The H22 crank has a 90.7mm stroke compared to the F23's 97mm stroke.

If you had an F22 you would have 50mm main journals, in which case you would need to find a 97 or older H22 crank, which would have 50mm main journals as well.

The H23A has 55mm main journals, but has a 95mm stroke, so that would be almost pointless. The H23A1's crank would fit into F22s because, well, they have the same exact crankshaft, in which case it would be completely pointless.

In any way, if you use a different crank, you'll need to figure out what rods and pistons to use to achieve whatever compression ratio you want, etc.