454 Flexplate question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hair · 03-11-2020, 11:15 PM

71 GMC with Inline 6 and power-glide tranny - I pulled the I6 and put in a 1989 454 from an RV. I have not started the engine yet, still waiting on a carb and a starter. The flex plate on the 454 would not bolt to the torque converter on the power-glide, so I just used the flex plate that was on the I6. But now I've learned that the 454 is externally balanced and uses a special flex plate.
Here are my questions:
1. Do I need to take the I6 Flex plate off and get the correct flex plate?
2. What will happen if I run the I6 Flex plate?
3. Can I buy a 454 flex plate with a hole pattern that will fit the PG torque converter?
4. Will a 454 flex plate fit in the bell housing of the PG?

03-11-2020, 11:15 PM	#1
Hair Registered User Join Date: Mar 2008 Location: Tullahoma, TN Posts: 406	454 Flexplate question 71 GMC with Inline 6 and power-glide tranny - I pulled the I6 and put in a 1989 454 from an RV. I have not started the engine yet, still waiting on a carb and a starter. The flex plate on the 454 would not bolt to the torque converter on the power-glide, so I just used the flex plate that was on the I6. But now I've learned that the 454 is externally balanced and uses a special flex plate. Here are my questions: 1. Do I need to take the I6 Flex plate off and get the correct flex plate? 2. What will happen if I run the I6 Flex plate? 3. Can I buy a 454 flex plate with a hole pattern that will fit the PG torque converter? 4. Will a 454 flex plate fit in the bell housing of the PG?



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