Yeah they can. That's how my brother did his when swapping a new PCM and harmonic balancer for his top swap.
Will it work with gxp's as well
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http://www.grandprixforums.net/my-06-gp-gxp-72403.html OBX headers, TEP tranny cooler, ls1 IM fuel rails and injectors, ls2 TB, ls7 MAF, full custom exhaust, Quad retro headlights, full out front and rear suspension work, tuned by HPT by me 8====>