Is GM Vortec 454 essentially the same thing as the 300-HP L29 7.4L?
#41
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one thing I have noticed, I have had 2 Marine L29(vortec)s and 2 truck L29s, the only single thing I can find different internally is the push rods are larger on the marine engines. there is also a sensor on the timing cover with a pick up on the crank but that does not affect anything.