Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - sbc vortec vs lt1 intake bolt pattern shared or different
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Old 02-17-2013, 05:26 PM
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No they are not the same. The water passages in the head/intake manfold are different too.
So is the respective height of the intake port. Port alignment is not the same.

heads and intakes are not swappable between the GEN I motors and Gen II LT-1 LT4 motors.

A L-31 vortec head needs a vortec intake manifold. There are plenty available so no good reason to consider adapting other stuff.

All the "L-31 Vortec" engines are Gen I
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