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Old 10-30-2023, 07:00 PM
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79 Phoenix 79 Phoenix is offline
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Join Date: Dec 2010
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Default 76 400 block fitment and compatibility questions

Hi I am considering swapping a 76 400 in place of my 350 in my 71 GT-37. I have the following questions:

1) Would the 76 400 block that came with factory automatic have a boss that could be drilled and tapped for the clutch linkage on my manual transmission 71 GT-37?

2)Would my 71 bell housing bolt up to the 76 400 block?

3) I believe the register on the crank for the flywheel got smaller in 76 on the 400’s to about 2 1/2”. Is that correct? If so would it make sense to use a flywheel listed for a 76 Firebird 400?

Any help would be greatly appreciated. Thanks!