The only possibly difference in the blocks would be if it's setup for a roller cam and whether it's a one or two piece rear main seal. Those are both dependent on the year rather than which intake setup was installed. The '91 block you have should be a 1 piece RMS roller block, any idea what year the TPI motor is?
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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