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  #1  
Old 12-16-2006, 02:28 PM
TonyG TonyG is offline
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Default 389 tri-power Q.
Are any of the parts interchangable from the 389 to a standard gm engine? This may be a really stupid question, but I have no idea about this engine.
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Old 12-16-2006, 02:55 PM
AllSpeedAndy AllSpeedAndy is offline
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As far as I know only to other pontiac motors, 400ci, 421,455. They are their
owne breed ya know.
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Old 12-20-2006, 03:48 PM
pdq67 pdq67 is offline
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I think a 400 is just a bored out 389 and has 3.00" mains.

The 421 and 455 have 3.25" mains.

Some what they call, "Super-Duty" engines have forged cranks whereas most others have cast.

I forget if Pontiac ever ran cast ARMA-STEEL rods or not??

Not much help..

pdq67
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