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Old 12-19-2005, 07:21 PM
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what size is my bonneville v-8?

i have a 67 bonneville. the last owner said it had a 389, but the owners manual states that in 67 it came with a 400 or a 428. is there anyway to decode the engine's numbers to see what block i have . any help is appreciated thanks.

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Old 12-19-2005, 08:34 PM
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do you have the engine casting code number thats on it? Also, the head numbers will help.

this link shows a bit of info where it should be at
http://www.yearone.com/updatedsingle...ontengid2.html

if you give us the code, someone can surely tell you what it is.

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Old 12-19-2005, 08:38 PM
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Sure. The two-letter code stamped on the front of the block will narrow it down. The two or three digit casting code on the center exhaust ports of the heads will help us narrow it down a little more if its an original assembly. Head codes on the big cars from a 66 389 would be either 092 or 093. 67 heads would be marked 670.

67 was the switch over to 400/428 from the previous 389/421 with a bore change. For all intents and purposes they are interchangable, but if its truly a 66 and earlier engine, be careful about swapping heads. The main difference is that the later heads are "taller" requiring longer pushrods.

If its the original engine, it should be a 400, or the optional 428. It could have been replaced with an earlier engine, but I've at least never heard about a factory equipped 67 pontiac with a 389.

For more info, try here.

http://pontiacs.org/modules.php?name=headchart

http://www.yearone.com/updatedsingle...ontengid4.html
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Old 12-20-2005, 02:28 AM
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thanks for the info. i am taking the bonneville to work today.i'll get the numbers off the block and post them.
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Old 12-20-2005, 03:12 PM
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well its a 400. thanks everybody for the info. how hard is it to get parts for it.
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Old 12-20-2005, 03:24 PM
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Parts shouldn't be hard, they made the 400 for quite a while.
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Old 12-20-2005, 03:35 PM
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Easy as pie. Its still a popular engine family. Pistons come in all sizes and compressions, rods are still available, and most gasket manufacturers make several types of complete gasket kits.

I would say that the aftermarket has as much support for Pontiacs as there is support for Ford Big Blocks.

Summit, Jegs, and PAW are all good sources for performance Pontiac parts, and your parts store should be able to order any replacement part you could think of. Hard-to-find Poncho-specific parts can be found PerfYearsPontiac.com or AmesPerf.com.
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Old 12-22-2005, 10:13 PM
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Check out www.pontiacstreetperformance.com and www.chiefmanyhorses.com
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