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post #1 of 20 (permalink) Old 12-16-2010, 02:11 AM Thread Starter
 
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Flavors of 389?

So, I was talking cars with Dad last night... At risk of evincing a serious misunderstanding of this engine stuff, I have a question.

When my dad was daily-driving his 66 Goat back in the day, his timing chain broke apart and nasty metal fragments worked their way into the engine somewhere and fouled it up. It was costlier to have the engine fixed than to drop in a brand new shortblock, and it was his daily, so he went with the short block and had the old, original subassemblies put onto that new core.

He mentioned regretting this decision, as it obviously permanently ruined the matching numbers aspect of the car, but he also mentioned "not knowing if that new 389 was a GTO 389 or not."

The question is Is there a GTO-specific type of 389 that went into cars like his, or is such a block generic? If there is a difference, would it be noticeable/significant?

One more thing, what the heck is an IA II?



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post #2 of 20 (permalink) Old 12-16-2010, 07:55 AM
 
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The date code wouldn't match the build date of the vehicle. Also, the engine 2 digit code probably didn't match the GTO. If the engine wasn't for a GTO it could have the big car cam in it. The compression also could be down, but beyond that, not much difference.

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post #3 of 20 (permalink) Old 12-16-2010, 09:52 AM
 
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An IAII (IA2) is an aftermarket block made by ALL PONTIAC. It is very strong, has many improvements over a stock block (ie splayed 4 bolt mains, a reinforced lifter valley, etc) They are available in cast iron and aluminum. I have included some pics below.



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post #4 of 20 (permalink) Old 12-16-2010, 11:18 AM
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Originally Posted by jetstang View Post
The date code wouldn't match the build date of the vehicle. Also, the engine 2 digit code probably didn't match the GTO. If the engine wasn't for a GTO it could have the big car cam in it. The compression also could be down, but beyond that, not much difference.
If all they changed out was the short block, then depending on what was used it's likely that the only thing that changed was the cam. The block itself would have been generic. There was only one 389 block for model year 1966 and it was part/casting number 9778789. If whoever did the work happened to have reused the original cam or if the assembly was bought from GM specific for the GTO, then it would have been essentially the same motor. The only thing "lost" was the matching numbers/codes.

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post #5 of 20 (permalink) Old 12-16-2010, 03:59 PM Thread Starter
 
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If all they changed out was the short block, then depending on what was used it's likely that the only thing that changed was the cam. The block itself would have been generic. There was only one 389 block for model year 1966 and it was part/casting number 9778789. If whoever did the work happened to have reused the original cam or if the assembly was bought from GM specific for the GTO, then it would have been essentially the same motor. The only thing "lost" was the matching numbers/codes.

Bear
Okay! Thanks for the info guys. It confirms my original suspicion, but I was really starting to second guess myself there for a while.

And the IA II blocks, how many guys are running those?



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post #6 of 20 (permalink) Old 12-16-2010, 06:41 PM
 
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And the IA II blocks, how many guys are running those?
1, that guy from New York with too much time and money!!
Eric, can't wait to hear it run, that thing is a monster..

You could always stamp the right code into the front of the block if there isn't any codes there.. But, if you have the receipt showing that the motor was swapped out under warranty, then it's not the "wrong" motor for the car.

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post #7 of 20 (permalink) Old 12-16-2010, 06:50 PM
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If he had documentation that the dealer installed the short block, it shouldn't hurt the value of the car.
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post #8 of 20 (permalink) Old 12-16-2010, 07:18 PM
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Duke, I'd be curious if your block is a "service replacement" block. What is the casting #, the 2-digit code, and the date code? That would shed some light on this. Also, if documented, this is all part of the car's "history", and not totally a "bad" thing. Stuff happened, things broke, things got repaired. You're very lucky that there was a GTO in your family. We had a Peugot and a Renault Dauphine.
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post #9 of 20 (permalink) Old 12-16-2010, 07:20 PM
 
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Originally Posted by Eric Animal View Post
An IAII (IA2) is an aftermarket block made by ALL PONTIAC. It is very strong, has many improvements over a stock block (ie splayed 4 bolt mains, a reinforced lifter valley, etc) They are available in cast iron and aluminum. I have included some pics below.
i guess if your engine doesnt have a place for water you can save a lot of money on radiators and hoses and water pumps and silly stuff like that.


Shane Doss

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post #10 of 20 (permalink) Old 12-16-2010, 09:13 PM
 
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+1 for Rukee and GeeTee, a service replacement is part of the provenance of your car, especially if dealer installed, no different than a new water pump....etc., sure all the casting have been replaced on our cars a few times so there are many parts that are not "numbers matching".

found this:
"Service Replacement (SR) blocks do not always have a code stamped on the front of the engine. They do, however, usually have a casting number. This casting number is usually on the RH side of the rear portion of the block - where the transmission bolts up.
Here they are:"

Technical Information: Pontiac 400 428 455 Casting Numbers
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