Pontiac had several SD4 cranks available for displacements from 2.0 to 3.3L
(with 4.000" bore) so engine could be used in many racing classes.
PN 10042835 2.600" stroke - 2.0L
PN 10027778 3.000" stroke - 2.5L
PN 10027779 3.250" stroke - 2.7L
PN 10093312 3.625" stroke - 3.0L
PN 10041860 3.9375" stroke - 3.3L
I have the 3.9375" stroke crank in my Indy.

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3.4L Supercharged 87 GT and Super Duty 4 Indy #163[This message has been edited by fierosound (edited 08-04-2013).]